Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

! $ ' +-Satyanarayan Gangaram Pitroda

Invent a New India Using Knowledge

01 ' 5 Jawaharlal Nehru

Step Out From the Old to the New

1 +, 1 +Mazdoor Kisan Shakti Sangathan

The Right to Information, The Right to Live

! > 0 B BharthariNtiatakam

Knowledge is such a treasure which cannot be stolen

Invent a New India Using Knowledge

IS 1293 (2005): Plugs and socket- outlets of rated voltageup to and including 250 volts and rated current up to 16amperes [ETD 14: Electrical Wiring Accessories]

IS 1293:2005

W?dh7WmF,

250dTFt Tl@#lif%dRWH%?k

(i%?iw pi%=Fl)Indian Standard

PLUGS AND SOCKET-OUTLETS OF RATEDVOLTAGE UP TO AND INCLUDING

250 VOLTS AND RATED CURRENT UP TO ANDINCLUDING 16 AMPERES SPECIFICATION

( Third Revision)

ICS 29.120.30

t

0 BIS 2005

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

October 2005 Price Group 17 J

P---

Electrical Wking Accessories Sectional Committee, ETD 14

FOREWORD

This Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, after the draft finalizedby the Electrical Wiring Accessories Sectional Committee had been approved by the Electrotechnical Division

4

Council.

This standard was first published in 1958. The first revision was brought out in 1967 and the second revision wasbrought out in 1988. This revision has been undertaken to bring it in line with latest International practices. Thisstandard covers the requirements and test methods for plugs and fixed or portable socket-outlets for ac and withand without earthing contact with a rated voltage above 50 V, but not exceeding 250 V and a rated current not

I

exceeding 16A intended for household and similar purposes for indoors and outdoors. This standard also coversplugs incorporated in cord sets and to plugs and portable socket-outlets incorporated in coqd extension sets.

In view of greater prevalence of the use of two pin plugs and socket-outlets in every household, it has becomenecessary to standardize such plugs. However the user must ensure proper earthing practices in their installation

/

?,

in line with IS 732 : 1989 Code of practice for electrical wiring installations and IS 3043 : 1987 Code of.,

practice for earthing. Two pin plugs are intended to be used only for class II appliances. :/:

This standard is based on IEC 60884-1 (2002) Plugs and socket outlet for household and similar purposes Part 1 : General requirements, issued by the International Electrotechnical Commission except for followingmodifications: L

a) Accessories ratings covered are only up to and including 16A and 250 V.b) Combined socket-outlet has been covered.c) Ambient test condition.d) Schedule of routine, acceptance and @e tests have been included.e) Rated voltage covered up to and including 250 V.

The test methods are technically equivalent to corresponding ISO/IEC publications as stated below:

Title/Clause IS No. ISO/IECRe$ of the Test

Clause 9 to 30 1293:2005 IEC 60884-1 (2002)Damp heat cycling test 9000 (Part 5/See 1 & 2): 1981 IEC 60068-2-30 (1980)Glow wire test 11000 (Part 2/See 1) :1984 IEC 60068-2-1 (1980)Electroplated coating of nickel 1068:1993 1S0 1456:1988plus chromium and of copperplus nickel plus chromium

Electroplated coating of tin 1359:1992 IS@093 :1986Electroplated coating of Zinc 1573:1986 1S02081 :1986on iron and steel

After the publication of this standard IS 6538:1971 Specification for three-pin plugs made of resilient materialshall be withdrawn since the requirements have been covered in this standard. #

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with1S 2: 1960 Rules of rounding off numerical values (revised. The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.

.IS 1293:2005,..

,,

,,

Indian StandardPLUGS AND SOCKET-OUTLETS OF RATED

VOLTAGE UP TO AND INCLUDING250 VOLTS AND RATED CURRENT UP TO ANDINCLUDING 16 AMPERES

SPECIFICATION( Third Revision)

1 SCOPE

1.1 This standard applies to plugs and fixed or portablesocket-outlets for ac only, with and without earthingcontact, with a rated voltage above 50 V but notexceeding 250 V and a rated current not exceeding16A. intended for household and similar purposes,either indoors or outdoors.

This standard does not cover requirement for flushmounting boxes, however it covers only thoserequirements for surface-type mounting boxes whichare necessary for the tests on the socket-outlet.

NOTES1 Requirements for mounting boxes are given inIS 14772.This standard applies also to plugs incorporated in cord setsand to plugs and portable socket-outlets incorporated in cordextension sets. It also applies to plugs and socket-outletswhichare a component of an appliance, unless otherwise stated in thestandard for the relevant appliance,2 Particular requirements are under consideration for

a) Adaptors;b) Fused plugs;c) Cable reels; andd) Plugs, fixed and portable socket-outlets for extra low

voltage (ELV) and safety extra low voltage (SELV).This standard does not apply to:a) Plugs, socket-outlets and couplers for industrial

purposes;b) Appliance couplers;c) Fixed socket-outlets combined with fuses, automatic

switches, etc; andd) Plugs, fixed and portable socket-outlets for ELV,

3 Socket-outlets with pilots lights are allowed provided thatpilot light comply with the relevant standard, if arty.Plugs and fixed or portable socket-outlets complying with thisstandard are suitable for use at ambient temperatures notnormally exceeding 35C but occasional y reaching 45C.4 Socket-outJetscomplyingwith this standardareonly suitablefor incorporation in equipment in such a way and in such aplace that it is unlikely that the ambient surroundingthe socket-outlet reaches a temperature exceeding 45C.In locations where special conditions prevail, as .in ships,vehicles and the like, and in hazardous locations, for example,where explosions are liable to occur, special constructions maybe required.

2 REFERENCES

2.1 The following standards are necessary adjuncts tothis standard:

1S No.

292:1983

694:1990

1068:1993

1359:

1573:

992

986

2824:1975

3010

(Part 1): 1965(Part 2): 1965

9000 (Part 5/See 1and2) :1981

Title

Leaded brass ingots and casting(second revision)PVC insulated cables for ~, ~]

,

working voltages up to and ti1?:., fincluding 1 100 V (third revision)

~d;Electroplated coatings of nickelplus chromium and copper plusnickel plus chromium (third .revision) $

i,,,,Electroplated coating of tin (third @revision)Electroplated coating of zinc on

1iron and steel (second revision)Method for determining thecomparative tracking index ofsolid insulating materials undermoist conditions (first revision)Appliances connectors and .flappliance-inlets (non-reversiblethree pin type): %Appliances connectors

Appliances inlet

Basic environmental testingprocedures for electronic andelectrical items : Part 5 Dampheat cycling test, Section 1, 16+8 h cycle, Section 2, 12 + 12 hcycle

9968 (Part 1) :1988 Elastomer-insulated cables:Part 1 For working voltages upto and including 1 100 V (firstrevision)

11000 (Part 2/ Fire hazard testing: Part 2 TestSec 1) :1984 method, Section 1 Glow wire test

and guidance

1

.IS 1293:2005

IS No.12063:1987

14340:1996

14772:2000

TitleClassification of degree ofprotection provided byenclosures of electricalequipment

Brass for current-carrying partsin electrical wiring accessories

General requirements forenclosures for accessories forhousehold and similar fixedelectrical installations

3 TERMINOLOGY

The following definitions shall apply for the purposeof this standard.

(The use of the accessories is shown in Fig. 1A).

3.1 Plug Accessory having pins designed to engagewith the contacts of a socket-outlet, also incorporatingmeans for the electrical connection and mechanicalretention of flexible cable(s).

3.2 Socket-Outlet Accessory having socket-contacts designed to engage with the pins of a plugand having terminals for the connection of cable(s).

3.3 Fixed Socket-Outlet A socket-outlet which isintended to be connected to the fixed wiring.

3.4 Portable Socket-Outlet Socket-outlet whichis intended to be connected to, or integral with, flexiblecables, and which can easily be moved from one placeto another while connected to the supply.

3.5 Multiple Socket-Outlet Combination of twoor more socket-outlets. (Example of portable multiplesocket-outlet is shown in Fig. lB).

3.6 Combined Socket-Outlets A socket assemblywith provision of plugging two or more types or ratingof plugs but in which only one or two plugs can beplugged in at a time. (Typical examples of combinedsocket-outlets are shown in Fig 1C).

3.7 Socket-Outlet for Appliances Socket-outletintended to be built in or fixed to appliances.

3.8 Rewirable Plug or Rewirable Portable Socket-Outlet Accessory so constructed that the flexiblecable can be replaced.

3.9 Non-rewirable Plug or Non-rewirable PortableSocket-Outlet

Accessory so constructed that it forms a complete unitwith the flexible cable after connection and assemblyby the manufacturer of the accessory (see also 14.1).

3.10 Moulded-on Accessory Non-rewirableaccessory the manufacture of which is completed byinsulating material moulded around pre-assembled

component parts and the terminations of the flexiblecable.

3.11 Mounting Box Box intended for mounting inor on a wall, floor or ceiling etc, for flush or surfaceapplication, intended for use with a fixed socket-outlet(s). A

3.12 Cord Set Assembly consisting of a flexiblecable fitted with a non-rewirable plug and a non-rewirable connector, intended for the connection ofan electrical appliance to the electrical supply.(Example of cord set is shown in Fig 1A). I3.13 Cord Extension Set Assembly consisting ofa flexible cable fitted with a non-rewirable plug and anon-rewirable portable socket-outlet. (Example of cord /extension set is shown in Fig 1A). f 3.14 Terminal insulated or non-insulated

),

connecting device serving for reusable electricalconnection of the external conductors.

t,

3.15 Termination Insulated or non-insulatedconnecting device intended for non-reusable electrical -%connection of the external conductors.

3.16 Clamping Unit Part or parts of a terminalnecessary for the mechanical clamping and theelectrical connection of the conductor(s).

3.17 Screw-Type Terminal Terminal for theconnection a;~ subsequent disconnection of aconductor or the interconnection of two or moreconductors capable of being dismantled, theconnection being made, directly or indirectly, by

k

means of screws or nuts of any kind.

3.17.1 Pillar Terminal Screw-type terminal in ,;which the conductor is inserted into a hole or cavity,where it is clamped under the shank of the screw orscrews. The clamping pressure may be applied directly .by the shank of the screw or through an intermediatemember to which presstme is applied by the shank ofthe screw. (Example of pillar terminals is given in %Fig. 34.)

3.17.2 Screw Terminal Screw-type terminal inwhich the conductor is clamped under the head of the tscrew. The clamping pressure may be applied directlyby the head of the screw or through an intermediatepart, such as a washer, clamping plate or anti-spreaddevice. (Example of screw terminals is given in

~

Fig. 35.)

3.17.3 Stud Terminal Screw-type terminal inwhich the conductor is clamped under a nut, Theclamping pressure may be applied directly by a suitablyshaped nut or through an intermediate part, such as awasher, clamping plate or anti-spread device.(Examp~e of stud terminals is given in Fig. 35.)

3.17.4 Saddle Terminal Screw-type terminal in

2

N..,...

which the conductor clamped under a saddle by meansof two or more screws or nuts. (Example of saddleterminals are given in Fig. 36.)

3.17.5 Mantle Terminal Screw-type terminal inwhich the conductor is clamped against the base of aslot in a threaded stud by means of a nut. The conductoris clamped against the base of the slot by a suitablyshaped washer under the nut, by a central peg if thenut is a cap nut, or by equally effective means fortransmitting the pressure horn the nut to the conductorwithin the slot. (Example of mantle terminals is givenin Fig. 37.)

3.18 Screwless Terminal Connecting device forthe connection and subsequent disconnection of oneconductor or the dismountable interconnection of twoor more conductors capable of being dismantled, theconnection being made, directly or indirectly, bymeans of springs, wedges, eccentrics or cones, etc,without special preparation of the conductorconcerned, other than removal of insulation.

3.19 Rated Voltage Voltage assigned to the plugor socket-outlet by the manufacturer.

3.20 Rated Current Current assigned to the plugor socket-outlet by the manufacturer.

3.21 Shutter Movable part incorporated into asocket-outlet arranged to shield at least the live socket-outlet contacts automatically when the plug iswithdrawn.

3.22 Thread-Forming Screw Tapping screwhaving an uninterrupted thread, which by screwingin, forms a thread by displacing material. (Exampleof a thread-forming screw is shown in Fig. 38.)

3.23 Thread-Cutting Screw Tapping screw havingan interrupted thread, which by screwing in, makesthread by removing material. (Example of thread-cutting tapping screw in Fig. 39.)

3.24 Type Test Tests carried out to proveconformity with the requirement of the specification.These are intended to prove the general qualities anddesign of the given type of plug or socket-outlets.

3.25 Acceptance Test Test carried out on samplestaken from a lot for the purpose of acceptance of thelot.

3.26 Routine Test Test carried out on each itemto check requirements which are likely to vary duringproduction.

3.27 Class I Appliances An appliance in whichprotection against electric shock does not rely on basicinsulation only, but which includes an additional safetyprecaution in that accessible conductive parts areconnected to the protective earthing conductor in thefixed wiring of the installation in such a way that

IS 1293:2005

accessible conductive parts cannot become live in theevent of a failure of the basic insulations.

3.28 Class II Appliances An appliance in whichprotection against electric shock does not rely on basicinsulation, only, but in which additional safetyprecautions, such as, double insulation or reinforcedinsulation are provided, there being no provision forprotective earthing or reliance upon installationcondition.

3.29 Safety Extra Low Voltage (SELV)-A nominalvoltage not exceeding 32 V between conductors andbetween conductors and earth or, for three phasesupply, not exceeding 18.5 V between conductors, andthe no-load voltage not exceeding 38 V and 22 Vrespectively.

3.30 Crimp Type Terminal Termination havingthe means of permanent connection made by crimpingthe part of terminal itself. It may also be made out ofsheet metal or solid metal.

NOTES1 Wherethe termsvoltage and currentarc used in thk standard,they imply rms vatues, unless otherwise specified.2 Throughout thk stsndard the word esrthing is used forprotective eartldng.3 The term sceessory is used ss a genersdterm covering plugsand socket-outlets; the term portable accessory covers plugsand portable socket-outlets.4 Through-outttds standardthe term socket-outtet covers bothfixed and portsble socket-outlets, except where the referenceis specific to one type or the other.

4 GENERAL REQUIREMENT

4.1 Accessories and surface type mounting boxes shallbe so designed and constructed that in normal use theirperformance is reliable and without danger to the useror surroundings. In general, compliance is checked bycarrying out all the relevant test specified.

5 GENERAL NOTES ON TESTS

5.1 Tests according to this standard are type tests.

5.1.1 Schedule of routine, acceptance and type testsare given in 31.

5.2 Unless otherwise specified, the specimens aretested as delivered and under normal conditions of use.

Non-rewirable accessories are tested with the type andsize of flexible cable as delivered; those notincorporated in a cord set or a cord extension set orwhich are not a component of equipments shall beprovided for testing, with at least 1 m of flexible cableof relevant specification.

Non-rewirable multiple portable socket-outlets aretested with flexible cables having a length of about2.5 m.

Socket-outlet which does not comply with any

3

IS 1293:2005

accepted standard dimensions specified in this standardare tested together with their corresponding boxes.

Socket-outlets, which require a box to complete theirenclosure, are tested with their boxes.

5.3 Unless otherwise specified the tests are carried outin the order of the clauses, at an ambient temperaturebetween 15C and 35C. In case of doubt the test aremade at an ambient temperature of 27 * 5C.

Plugs and socket-outlets are tested separately.

The neutral, if any, is treated as a pole.

5.4 Three samples are subjected to all the relevanttests.

For the tests of Screwless Terminals for ExternalConductor (see 12.3.1 1) additional samples of socket-outlets having in total at least 5 screwless terminalsare required.

For the test of Screwless Terminals for ExternalConductor (see 12.3.12), three additional samples ofsocket-outlets are necessary: in each sample oneclamping unit is tested.

For each of the tests of construction of fixed socket-outlet (see 13.22 and 13.23), three additional samplesof separate membranes, or of accessories incorporatingmembranes, are required.

For non-rewirable accessories, six additional samplesare required for the tests of Flexible Cable and theirconnection (see 23.2 and 23.4).

For the test of Mechanical Strength (see 24.10), threeadditional samples are required.

For the test of Resistance of Insulating Material toAbnormal Heat, to Fire and to Tracking (see 28), threeadditional samples may be necessary.

5.5 Accessories are deemed not to comply with thisstandard if there are more failures than that of onesample in one of the tests.

If one sample fails in a test, that test and thosepreceding, which may have influenced the result ofthat test, are repeated on another set of samples of thenumber specified in 5.4, all of which shall then complywith the repeated tests.

NOTES1 In generrd,it will only be necessaryto repeat the tests whichcaused the failure, unless the sample fails in one of the tests of20 to 22 inclusive, in which case the tests are repeated tlomthat of 19onwards.2 The manufacturermay submit together with the number ofsamples specified in 5.4, the additional set of samples whichmay be needed should one sample fail. The testing authoritywill then, without finther request test the addltionat samplesand will only reject if a firrther faihsre occurs. If the additionalset of samples is not submitted at the same time, a failure ofone sample will entail a rejection.

6 RATINGS

6.1 Accessories shall preferably be of a type andpreferably have voltage and current ratings as shownin Table 1.

6.2 In a cord extension set, the rated current of theportable socket outlet shall be not higher and the ratedvoltage shall be not less than that of the plug.

Compliance is checked by inspection of the marking.

An example of cord extension set is shown in Fig. 1A.

7 CLASSIFICATION

7.1 Accessories are Classified

7.1.1 According to the degree of protection againstharmful ingress of wate~

Table 1 Preferred Combination

ordinary accessories, that is with degree ofprotection not higher than IPXO or IPX1, whenmounted on a vertical surface as for normal use,NOTE For the purpose of ttds standard the term ordinaryapplies only to the degree of protection against harmful ingressof water.

Splash-proof accessories, that is with-degree ofprotection IPX4, and

of Types and Ratings

(Clause 6.1)Type Rated Voltage Rated Current

v A(1) (2) (3)

2 pole (non-rewirable plugs only) 230,240 and 250 2.5

2 pole (plugs only) 230,240 and 250 6

2 pole + ~ 230,240 and 250 61)1016

NOTE Standardized dimensions of the plugs and socket-outlet are given in Annex A.

I) Intem~tionalpracticesprovidefor 10Aso~ket.outle~ for ~] app]i~ces ~quiringUpto ad including10Awhereas in Indi&the socketof 6A is still in use. The manufacturer would develop 10Asocket-outlets with the same physicrddimensions as of the present 6A socket-outlets. After satisfactory development of 10Asocket-outlets, the 6A socket-outlets are to be phased out in tirture.

4

Jet-proof accessories, that is with degree ofprotection IPX5.

7.1.2 According to the provision for earthing:

a) Accessories without earthing contact; andb) Accessories with earthing contact.

7.1.3 According to the method of connecting thecable:

a) Rewirable accessories; andb) Non-rewirable accessories.

7.1.4 According to the type of terminals:a) Accessories with screw-type terminals;b) Accessories with screwless terminals for rigid

conductors only; andc) Accessories with screwless terminals for rigid

and flexible conductors.

7.2 Socket-Outlets are Classified

7.2.1 According to the degree of protection againstelectric shock when mounted as for normal use:

a) With normal protection (see 10.1); andb) With increased protection (see 10.7).NOTE Socket-outlets with increased protection may besocket-outlet with or without shutters.

7.2.2 According to the existence of enclosures:

a) Unenclosed; andb) Enclosed.NOTE For unenclosed socket-outlets, the protection againstelectric shock is given by the enclosure in which the socket-outlet is intended to be mounted.

7,2.3 According to the existence of shutters:

a) Without shutters; andb) With shutters (see 10.5).

7.2.4 According to the method of applicationmounting of the socket-outlet:

a) Surface-type;b) Flush-type;c) Semi-flush type;d) Panel-type;e) Architrave-type;f) Portable-type;g) Table-type (single or multiple);h) Floor recessed type; andj) Appliances type.

7.2.5 According to the method of installation, as aconsequence of the design:

a) Fixed socket-outlets where the cover or cover-plate or parts of them can be removed without

IS 1293:2005

displacement of the conductors (design A); andb) Fixed socket-outlets where the cover or cover-

plate or parts of them cannot be removedwithout displacement of the conductors(design B).

NOTE If a fixed socket-outlet has a base (main part) whichcannot be separated from the cover or cover-pIate, and requiresa supplementary plate which can be removed for redecoratingthe wall without displacementof the conductors, it is consideredto be of design A, provided the supplementary plate meets therequirements specified for covers and cover-plates.

7.3 Plugs are classified according to the class ofappliances to which they are intended to be connected:

a) Plugs for appliances of Class 1; andb) Plugs for appliances of Class II.

8 MARKING

8.1 Accessories shall be marked with:

a) Rated current, in amperes;b) Rated voltage, in volts;c) Symbol for nature of supply;d) Manufacture or responsible vendors name,

trade-mark or identification mark;e) Type reference, which may be a catalogue

number;

f) Symbol for degree of protection against ingressof solid foreign bodies, if higher than IP2x;

g) Country of manufacture; andh) Symbol for degree of protection against harmtil

ingress of water, if applicable, in which casethe symbol for degree of protection againstingress of solid foreign bodies shall be markedeven, if not higher than IP2X.

If the system allows plugs of a certain 1P ratings to beintroduced into socket-outlets having another 1P rating,attention shall be drawn to the fact that the resultingdegree of protection of the combination plugfsocket-outlet is the lower of the two. They shall be stated inthe manufacturers literature related to the socket-outlet.

NOTE The degree of protection are based on IS 12063.

In addition, socket-outlets with screwless terminalsshall be marked with:

an appropriate marking indicating the length ofinsulation to be removed before the insertion ofthe conductor into the screwless terminal; and

an indication of the suitability to accept rigidconductors only, for those socket-outlets havingthis restriction.NOTES1 The additional markings maybe put on the socket-outlet,on the packagingunit and/orgiven in an inshuction sheet which

P,,.,..,. +

;,),

l

,.

,

5

IS 1293:2005

8.2

accompanies the socket-outlet.2 Fortwopin (twopole)plugsfollowing information shaUbegiven on the cartons:Plugs of two poles are suitable for class II appliances only.

When symbols are used, they shall be as follows:

amperes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..A

volts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..V

alternating current . . . . . . . . . . . . . . . . . . . . . . . . ...-

neutral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..N

earth . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A

splash-proof construction . . . . . . . . . . . . ..IPX4

jet-proof construction . . . . . . . . . . . . . . . . . . .IPX5terminal for line (live) . . . . . . . . . . . . . . . . . ..L

NOTES1 Lines formed by the construction of the tools are notconsidered as part of the mssrkhg.2 In the 1Pcode the letter X concerningprotectionagainstingressof solid objects shall be replacedbythe relevantnumber.3 Ordinary accessories are not msrked with any symbol forprotection against harmful ingress of water.

For the marking with rated current and rated voltage,figures may be used alone. These figures shall beplaced on one line separated by an oblique line or thefigure for rated current shall be placed above the figurefor rated voltage, separated by a horizontal line.

The marking for nature of supply shall be placed nextto the marking for rated current and rated voltage.

NOTEThemarkhg forcurren~ vohage and natureof supplymay be, for example, as follows:

16 A250V - or 16/250- or 161250-

8.3 For fixed socket-outlets the marking with ratedcurrent, rated voltage and nature of supply, either thename, trade-mark or identification mark of themanufacturer or of the responsible vendor and the typereference shall be on the main part.

NOTE Thetypereference maybe the series referencesonly.

Parts such as cover-plates, which are necessary forsafety, purposes and are intended to be sold separately,shall be, marked with either the name, trade-mark oridentification mark of the manufacturer or of theresponsible vendor and the type reference.

The symbol for degree of protection against harmfilingress of water, if applicable, shall be marked on theoutside of its associated enclosure so as to be easilydiscernible when the socket-outlet is mounted andwired as for normal use.

NOTES1 Additional type referencesmaybe marked on the main pastor on the outside or inside of the associated enclosure.

6

2 The term main part means the part carrying the socketwrntacts.

8.4 For plugs and portable socket-outlets, the markingspecified in 8.1, other than the type reference, shallbe easily discernible when the accessory is wired andassembled.

Plugs and portable socket-outlets for equipments ofclass II shall not be marked with the symbol for class11construction.

NOTE The type referenw. of rewirable accessories may bemarked on the inside of the enclosure or cover.

8.5 Terminals intended exclusively for the neutralconductor shall be indicated by the letter N. Earthingterminals shall be indicated by the symbol A.

The marking shall not be placed on screws, or any

/

.

other easily removable parts.

Terminals provided for the connection of conductors,

Fnot forming part of the main fimction of the socket- /outlet shall be clearly identified unless their purpose !is self-evident, or indicated in a wiring diagram which Lshall be f~ed to the accessory.

The identification of accessory terminals may beachieved by:

their marking with graphical symbols or coloursandfor,

alpha-numeric system, or

their physical dimensions or relative location.

Leads of neons or indicator lamps are not consideredto be conductors for the purpose of this sub-clause.

NOTES1 Easily removable parts are those parts which csrs beremoved during the normal installation of the socket-outlet orthe assembly of the plug.2 Terminationin non-rewirable need not be marked.

8.6 Fixed socket-outlets other than ordinary shall bemarked with the symbol for the degree of protectionagainst harrnfi.d ingress of water so that it is visiblewhen the accessory is installed. For surface typemounting boxes, the marking may be made onboxes forming an integral part of the socket-outlet,provided the symbol is visible when the accessory isinstalled.

Compliance is checked by inspection.

8.7 Marking shall be durable and easily legible.

Compliance is checked by inspection and by thefollowing testi

The marking is rubbed by hand for 15s with a pieceof cloth socked with water and again for 15 s with apiece of cloth soaked with petroleum spirit.

IS 1293:2005

,T -

P.,.,!.

,.!~

,.

NOTES1 Marking made by impressio~ mordding, pressing orengraving is not subjected to ttds test.2 It isrccommendedthat thepetrolemnspirit rrsedconsistofa solvent hexane with an aromatic content of maximum 0.1percentage by volume, a kauributanol value of 29, an initirdboiling point of approximately 65C, a dry point ofapproximately 69C and a specific density of approximately0.68 g/cm].

8.8 The accessories may also be marked with theStandard Mark.

8.8.1 The use of the Standard Mark is governed bythe provision of Bureau ofIndian Stan&r&Act, 1986and the Rules and Regulations made thereunder. Thedetails of conditions under which the license forthe use of the Standard Mark maybe granted to themanufacturers or the producers maybe obtained fromthe Bureau of Indian Standards.

9 CHECKING OF DIMENSIONS

9.1 Plugs and socket-outlets shall comply with theappropriate gauge (see Annex B). The dimensions ofplugs and socket-outlets are given in Annex A.

Insertion of plugs into f~ed or portable socket-outletshall be ensured by their compliance with the relevantgauges.

Compliance is checked by measurement and/or bymeans of gauges. The manufacturing tolerances ofthese gauges shall be as shown in Table 2, if nototherwise, specified, The most unfavorabledimensions shall be used for the design of the gauges.

NOTE In some cases (for example, distances betweencentres), it might be necessary to check both the extremedimensions.

Socket-outlets are subjected, before the above

Table 2 Gauge Tolerances

(Clause 9.1)S1No. Gauge for Checking Gauge Tolerance

mm

(1) (2) (3)

i) Pin diameter o-0.01

ii) Dimension of entry holes corres- + r).olpending to pin diameter and to odistance be~een contact surfaces

iii) Pin length and width o0.1

iv) Pin spacing (according to the case) o + 0.2-0.2 or O

v) Distance from engagement face to o + 0.05point of first touch of socket -0.05 or Ocontact(accordingto the case)

vi) Guiding elements * 0.03

checking, to ten insertions and ten withdrawals of aplug complying with the corresponding plugs as givenin Annex A having the maximum dimensions for thepins.

9.2 It shall not be possible, within a given system, toengage a plug with:

a) Socket-outlet having a higher voltage rating ora lower current rating; and

b) Socket-outlet with a different number of livepoles; exceptions may be admitted for socket-outlets which are specially constructed for thepurpose to allow engagement with plugs of alower number of poles, provided that nodangerous situation can arise, for example, aconnection between a live pole and an earthingcontact or the interruption of the earthing circuit.

It shall not be possible to engage a plug for applianceof Class I with a socket-outlet exclusively designed toaccept plugs for Class II equipments.

Compliance is checked by inspection or by manualtest using gauges, the manufacturing tolerances ofwhich shall be as specified in 9.1.

In case of doubt the impossibility of insertion ischecked by applying the appropriate gauge for 1 minwith a force of 150 N.

Where the use of elastomeric or thermoplastic material $is likely to influence the result of the test, it is carried

;x*,

out at an ambient temperature of 40 * 2C, both theaccessories and the gauges being at this temperature.

NOTE For accessories of rigid material, such as, ithermosetting resins, ceramic material and the like, conformityto the dimensionsas given in Annex B ensureacompliance withthe requirement.

9.3 Deviations from the dimensions specified inAmex A may be made, but only if they provide atechnical advantage and do not adversely affect the .safety of accessories complying with the dimensions $as given in Annex A, especially with regard tointerchangeability and non-interchangeability. %Accessories with such deviations shall, however,comply with all other req~irements of this standard asfar as they reasonably apply.

,

10 PROTECTION AGAINST ELECTRIC SHOCK

10.1 Socket-outlet shall be so designed that, whenthey are wired and mounted as for normal use, live J

parts are not accessible, even after removal of partswhich can be removed without the use of a tool.

Live parts of plugs shall not be accessible when theplug is in partial or complete engagement with asocket-outlet.

The specimen is mounted as for normal use-and fittedwith conductors of the smallest cross-sectional areas

7

IS 1293:2005

and the test is then repeated using conductors of thelargest cross-sectional areas as specified in Table 3.

For socket-outlets, the standard test finger shown inFig. 2, is applied in every possible position.

For plugs, the test finger is applied in every possibleposition when the plug is in partial or completeengagement with a socket-outlet.

An electrical indicator with a voltage not less than40 V and not more than 50 V, is used to show contactwith the relevant part.

For accessories where the use of elastomeric orthermoplastic material is likely to influence therequirement, the test is repeated but at an ambienttemperature of 40 * 20C, the accessories being at thistemperature.

During this additional test the accessories are subjectedfor 1 min to a force of 75 N, applied through the tip ofa straight unjointed test finger of the same dimensionsas the standard test finger. This finger, with anelectrical indicator as described above, is applied toall places where yielding of the insulating materialcould impair the safety of the accessory, but it is notapplied to membranes or the like and is applied tothin walled knock-out with a force of 10 N.

During this test, the accessories, with its associatedmounting means, shall not deform to such an extentthat dimensions shown in Annex A which ensure safetyare unduly altered and no live part shall be accessible.

Each sample of plug or portable socket-outlet is thenpressed between two flat surfaces with a force of150 N for 5 rein, as shown in Fig. 22. Fifteen minutesafter removal of the test apparatus, the samples shallnot show such deformation as would result in unduealteration of those dirhensions shown in Annex Awhich ensure safety.

10.2 Parts which are accessible when the accessory iswired and mounted as for normal use, with theexception of small screws and the like, isolated fromlive parts, for fixing bases and covers or cover platesof fixed socket-outlets, shall be made of insulatingmaterial; however the covers or cover-plate of fwedsocket-outlets may be made of metal if therequirements given in 10.2.1 or 10.2.2 are fi.dfilled.

10.2.1 Metal covers or cover-plates are protected bysupplementary insulation made by insulating liningor insulating barrier fixed to covers or cover-plates orto the body of the accessories, in such a way that theinsulating linings or insulating barrier cannot beremoved without being permanently damaged, or sodesigned that they cannot be replaced in an incorrectposition and that, if they are omitted, the accessoriesare rendered inoperable or manifestly incomplete, andthere is no risk of accidental contact between live parts

and metal covers or cover-plates, for example, throughtheir f~ing screws, even if a conductor should comeaway fi-om its terminal, and if precautions are taken inorder to prevent creepage distances or clearancesbecoming less than the values specified in 27.

In the case of single pole insertion, the requirementsgiven in 10.3 applies.

Compliance is checked by inspection.

The above lining or barriers shall comply with the testof 17 and 27.

NOTE Insulating coating sprayed on the inside or on theoutside of the metal covers or cover plates is not deemed to bem insuladng linkrgor barrier for the purpose of W sub-clause.

10.2.2 Metal covers or cover-plates are automaticallycomected, through, a low resistance connection; tothe earth during fixing of the cover or the cover-plateitself.

The creepage distances and the clearances betweenthe live pins of a plug when fully inserted and theearthed metal cover of a socket-outlet shall complywith items 2 and 7 of Table 23 respectively; in addition,for the case of single pole insertion, the requirementgiven in 10.3 applies.

NOTE Fixing screws or other means ars allowed.

Compliance is checked by inspection and by the testof 11.5.

In the case of single pole insertion, the requirementgiven in 10.3 applies.

10.3 It shall not be possible to make connectionbetween a pin of a plug and a live socket-contact of asocket-outlet while any other pin is accessible.

Compliance is checked by manual test and by meansof the gauges whose dimensions are the less favorablefor this kind of tes~ the tolerances of the gauges shallbe specified in 9.1.

For accessories with enclosures or bodies ofthermoplastic material, the test made at an ambienttemperature of 35 + 2Cyboth the accessory and thegauge being at this temperature.

For socket-outlets with enclosures or bodies of rubberor polyvinyl chloride, the gauge is applied with a forceof 75 N for 1 min.

For fixed socket-outlet provided with metal covers orcover-plates, a clearance, between a pin and a socket-contact, of at least 2 mm is required, when anotherpin, or pins, is (are) in contact with the metal coversor cover-plates.

NOTESingle pole insertion may be prevented by @euse ofat least one of the following means:

a) Suff]cientIy large cover or cover-plate,

8

b) Other means (for example, shutters).

10.4 External parts of plugs and portable socket-outlets, with the exception of assembly screws andthe like, current-carrying and earthing pins, earthingstraps and metal rings around pins, shall be ofinsulating material.

The overall dimensions of rings, if any, around pinsshall not exceed 8 mm concentric with respect to thepin.

Compliance is checked by inspection.NOTE Lacquer,enamelsprayedinsulatingcoatingarenotdeemedto be insulatingmaterial for the purpose of 10.1 to10.4

10.5 Shuttered socket-outlets shall, in addition, be soconstructed that live parts are not accessible, withouta plug in engagement, with the gauge shown in Fig. 4.

To ensure this degree of protection, socket-outlets shallbe so constructed that the live contacts areautomatically screened when the plug is withdrawn.

The means for achieving this shall be such that theycannot easily be operated by anything other than aplug and it shall not depend upon parts which are liableto be lost.

The gauge shall be applied to the entry holescorresponding to the live contacts only and shall nottouch live parts.

An electrical indicator with a voltage not less than40 V and not more than 50 V, is used to show contactwith the relevant part.

Compliance is checked by inspection and, for socket-outlets with a plug completely withdrawn by applyinga steel gauge as shown in Fig. 4 with a force up to 1 Nand with three independent straight movementsapplied in the most unfavorable conditions,withdrawing the gauge after each movement; socket-outlet with a plug partially inserted are checked withthe test finger shown in Fig. 2.

For socket-outlets with enclosures or bodies ofthermoplastic material, the test is made at an ambienttemperature of 35 + 5C, both the socket-outlets andthe gauge being at this temperature.

10.6 Earthing contacts, if any, of a socket-outlet shallbe so designed that they cannot be deformed by theinsertion of a plug to such an extent that safety isimpaired.

Compliance is checked by the following test:

The socket-outlet is placed in such a position that thesocket-contacts are in the vertical position.

A test plug, corresponding to the type of socket-outlet,; :.. .+,..+,. .J ;.. .- .I. .-. .-l. -. -. ..1-. with a force of 150 N1> lll>G1 LCU UILU L1lG SU(,AGL-UULIGIwhich is applied for 1 min.

..

IS 1293:2005

Afier this tes~ the socket-outlet shall still comply withthe requirement of 9.

10.7 Socket-outlets with increased protection shallbe so constructed that, when mounted and wired as innormal use, live parts shall not be accessible.

Compliance is checked by inspection and by applyingwith the gauge of Fig. 4, a force of 1 Non all accessiblesurfaces in the most unfavorable conditions withouta plug inserted.

For socket-outlets with enclosures or bodies ofthermoplastic material, the test is made at an ambienttemperature of 40 + 5C, both socket-outlets and thegauge being at this temperature.

During this test live parts shall not be accessible bythe gauge.

An electrical indicator as described in 10.1 shall beused.

11 PROVISION FOR EARTHING

11.1 Accessories with earthing contact shall be so~constructed that, when inserting the plug, the earthconnection is made before the current carrying contactsof the plug become live.

When withdrawing the plug, the current-can-ying pinsshall separate before the earth connection is ,broken.

Compliance is checked by inspection of themanufacturing drawings, taking into account the effectof tolerances, and by checking he samples againstthese drawings.

NOTE Conformity with the dimensional requirementsensures eomplianec with thk requirement.

11.2 Earthing terminals of rewirable accessories shallcomply with the appropriate requirements of 12.

They shall be of the same size as the correspondingterminals for the supply conductors, except that anyadditional external earthing terminals of fixed socket-outlets shall be at least of, 6 mm2.

Earthing terminals of rewirable accessories withearthing contact shall be internal.

NOTE For freedsocket-outletan additionalesrtbiig terminalmay be extemat.

Earthing terminals of fixed socket-outlets shall be fixedto the base or to a part reliably fixed to the base.Earthing contacts of fixed socket-outlets shall be fixedto the cover, they shall be automatically and reliablyconnected to the earthing terminal when cover is putin place, the contact pieces being silver-plated orhaving a protection no less resistant to corrosion andabrasion.

This connection shall be ensured under all conditionswhich may occur in normal use, including loosening

9

..

IS 1293:2005

of cover fixing screws, careless mounting of the cover,etc.

Except as mentioned above, parts of the earthing circuitshall be in one piece or shall be reliably connectedtogether by riveting, welding, or the like.

NOTES1 The requirement regarding the connection between earthingcontacts fixed to a cover and an earthingterminalmaybe metby the use of a solid pin and a resilient socket-contact.2 For the purpose of the requirements of this sub-clause,screws are not considered as parts of contact pieces.

When considering the reliability of the connectionbetween parts of the earthing circuit, the effect ofpossible corrosion is taken into account.

11.3 Accessible metal parts of fixed socket-outletswith earthing contact, which may become live in theevent of an insulation fault, shall be permanently andreliably connected to the earthing terminal.

NOTES1 This requirement does not apply to the metat cover-platesmentioned in 10.2.1.2 For the purpose of this requirement smatl screws and thelike, isolated from live parts, for fixing bases, covers or cover-plates, are not consideredas accessibleparts which may becomelive in the event of an insulation fault.3 This requirement means that, for fixed socket-outlet withmetal enclosures having an external earthing terminal, thisterminal must be interconnected with the terminal fixed to thebase.

11.4 Socket-outlets other than ordinary with anenclosure of insulating material, having more than onecable inlet, shall be in addition provided with aninternal earthing terminal allowing the connection ofan incoming and outgoing conductor for the continuityof the earthing circuit, unless the earthing terminal ofthe socket-outlet itself is so designed that it allows theconnection of an incoming and an outgoing earthingconductor together.

Compliance with the requirement of 11.2 to 11.4 ischecked by inspection and by the tests of 12.

11.5 The connection between the earthing terminaland accessible metal parts to be connected thereto,shall be of low resistance.

Compliance is checked by the following test

A current derived from an ac source having a no-loadvoltage not exceeding 12 V and equal to 1.5 timesrated current or 25 A, whichever is the greater, ispassed between the earthing terminal and each of theaccessible metal parts in turn.

The voltage drop between the earthing terminal andthe accessible metal part is measured and the resistanceis calculated from the current and this voltage drop.

In no case shall the resistance exceed 0.05 f2.

NOTE Care shallbe taken that the contact resistarw betweenthe tip of the measuring probe and the metal part under testdoes not influence the test results.

12 TERMINALS

All the tests on terminals, with the exception of thetest of 12.3.11, shall be made after the test of 16.

12.1 General

12.1.1 Rewirable fixed socket-outlet shall be providedwith screw-type terminal or with screwless terminals.

Rewirable plugs and rewirable portable socket-outletsshall be provided with screw-type terminals.

If pre-soldered flexible conductors are used, care shallbe taken that in screw-type terminals the pre-solderedarea shall be outside the squeezed area when connectedas for normal use.

The means for clamping the conductors in the terminalsshall not serve to fix any other component, althoughthey may hold the terminals in place or prevent themfrom turning.

12.1.2 Non-rewirable accessories shall be providedwith soldered, welded, crimped or equally effectivepermanent connections; screwed or snap-onconnections shall not be used.

Connections made by crimping a pre-soldered flexibleconductor are not permitted, unless the soldered areais outside the crimping area.

12.1.3 Compliance is checked by inspection and bythe tests of 12.2 or 12.3, as applicable.

12.2 Terminals with screw clamping for externalcopper conductors.

12.2.1 Accessories shall be provided with terminalswhich shall allow the proper connection of copperconductors having nominal cross-sectional areas asshown in Table 3.

The conductor space shall beat least that specified inFig. 34,35, 36, or 37.

Compliance is checked by inspection, by measurementand by fitting conductors of the smallest and largestcross-sectional areas specified.

12.2.2 Terminals with screw clamping shall allow theconductor to be comected without special preparation.

Compliance is checked by inspection.NOTE The term specird preparation covers soldering ofthe wires of the conductor, use of cable lugs, formation ofeyelets, etc, but not the reshaping of the conductor before itsintroduction into the terminal or the twisting of a flexibleconductor to consolidate the end.

12.2.3 Terminals with screw clamping shall haveadequate mechanical strength.

10

IS 1293:2005

Table3 Relationship Between Rated Current and Connectable Nomina1Cross-Section Areas of Copper Conductors

(Clauses 10.1, 12.2.1, 12.2.5, 12.2.7, 12.2.8, 12.2.11, 13.4,24.2 and27.1)

Rigid (Solid or Stranded)Copper Conductors)

/ \Current and Nominal Cross- Diameter ofType of the Sectional Area the LargestAccessory Conductor

mm2 mm

(1) (2) (3)

Flexible CopperConductors

A/ \Nominal Cross- Diameter ofSectional Area the Largest

Conductormm2 mm

(4) (5)

6A From 0.75 up to 1.731.5 inclusive

10A From 1 up to 2.5 2.13 (Fixed inchrsivez)accessory)IOA From 0.75 up to 1.73(Portable 1.5 inclusiveaccessory)16A From 1.5 up to 2.13

2 x 2,5inclusive

2P+(Fixed accessory)16A From 0.75 up to

1.5 inclusive

2P+(Portable accessory)

o The use of flexible conductors is permitted.z)The temina] shall allow the connection of two 1.5 mmzconductors which have a dkmteter Of1.45 mm.

1.73

Screws and nuts for clamping the conductors shall have

~

an ISO metric thread or a thread comparable in pitchand mechanical strength. Screws shall not be of metalwhich is soft or liable to creep, such as zinc oraluminium.

1I Compliance is checked by inspection and by the tests

of 12.2.6 and 12.2.8.

i 12.2.4 Terminals with screw clamping shall beresistant to corrosion.

Terminals, the body of which is made of copper or a,

copper alloy as specified in 26.5 are considered ascomplying with this requirement.

12.2.5 Terminals with screw clamping shall be sodesigned that they clamp the conductor(s) withoutundue damage to the conductor(s).

Compliance is checked by the following test:I

The terminal is placed in the test apparatus accordingto Fig. 32 and fitted with rigid (solid or stranded)conductor(s), according to Table 3, first with thesmallest and then with the largest cross-sectional area,

the clamping screws or nuts being tightened with thetorque according to Table 6.

The length of the test conductor shall be 75 mm longerthan the height (H) specified in Table 9.

The end of the conductor is passed through anappropriate bushing in a plate positioned at a height(H) below the equipment as given in Table 9. Thebushing is positioned in a horizontal plane such thatits centre line describes a circle of 75 mm diameter,concentric with the centre of the clamping unit in thehorizontal (plane); the platen is then rotated at a rateof (1 O * 2) rev/rein.

The distance between the mouth of the clamping unitand the upper surface of the bushing shall be within+ 15 mm of the height in Table 9. The bushing maybe lubricated to prevent binding, twisting, or rotationof the insulated conductor.

A mass as specified in Table 9 is suspended from theend of the conductor. The duration of the test isapproximately 15 min.

During the test, the conductor shall neither slip out of

i, .,,,

,.

::I

11

IS 1293:2005

the clamping unit nor break near the clamping unit,nor shall the conductor be damaged in such a way asto render it unfit for further use.

The test shall be repeated with rigid solid conductorsin the case they exist in the relevant Indian Standard,if the first test has been made with rigid strandedconductors. Where rigid stranded conductors do notexist, the test may be made with rigid solid conductorsonly.

12.2.6 Terminals with screw clamping shall be sodesigned that they clamp, the conductor reliably andbetween metal surfaces.

Compliance is checked by inspection and by thefollowing test:

The terminals are fitted with rigid solid or strandedconductors for fixed socket-outlets and flexibleconductors for plugs and portable socket-outlet of thesmallest and largest cross-sectional areas specified inTable 4, the terminal screws being tightened with atorque equal to two third of the torque shown in theappropriate column of Table 6.

If the screw has hexagonal head with a slot, the torqueapplied is equal to two-thirds of the torque shown inCO12 of Table 6.

Each conductor is then subjected to a pull as specifiedin Table 4 applied without jerks for 1 rein, in thedirection of the axis of the conductor space.

If the clamp is provided for two or three conductorsthe appropriate pull is applied consecutively to eachconductor.

During the test, the conductor shall not movenoticeably in the terminal.

12.2.7 Terminals with screw clamping shall be sodesigned or placed that neither a rigid solid conductornor a wire of a stranded conductor can slip out whilethe clamping screws or nuts are tightened.

Compliance is checked by the following test

The terminals are fitted with conductors having thelargest cross-sectional area specified in Table 3.

The terminals of f~ed socket-outlet are checked bothwith rigid solid conductors and with rigid strandedconductors.

The terminals of plugs p.nd portable socket-outlet arechecked with flexible conductors.

Terminals intended for the looping-in of two or threeconductors are checked, being fitted with thepermissible number of conductors.

Terminals are fitted with conductors having thecomposition shown in Table 5.

Before insertion into the clamping means of theterminal, wires of rigid (solid or stranded) conductorsare straightened; rigid stranded conductors may, inaddition, be twisted to restore them approximately totheir original shape and flexible conductors are twistedin one direction so that there is a uniform twist of onecomplete turn in a length of approximately 20 mm.

The conductor is inserted into the clamping means ofthe terminals for the minimum distance prescribed,where no distance is prescribed, until it just projectsfrom the far side of the terminals and in the positionmost likely to allow the wire to escape.

The clamping screw is then tightened with a torqueequal to two third of the torque shown in theappropriate column of Table 6.

For flexible conductors the test is repeated with a newconductor which is twisted as before, but in theopposite direction.

After the test, no wire shall have escaped from theclamping unit thus reducing creepage distances andclearances to values lower than those indicated in 27.

12.2.8 Terminals with screw clamping shall be so fixedor located within the accessory that when the clampingscrews or nuts are tightened or loosened, the terminalsshall not work loose ficrm their finings to accessories.

NOTES1 These requirementsdo not imply that the terminals aredesignedso that their rotationor displacementis prevented,butanymovementmustbesufficientlylimitedsoasto preventnon-compfiarrcewith tbk standard.

Table 4 Values for Pull Test

(Clause 12.2.6)Nominal Cross-Section Above 0.75 Above 1.5 Above 2.5 Above 4 Above 6of Conductor Accepted up to 1.5 Ufrto 2.5 up to 4 Up to 6 up to 10

by the Terminal Inclusive Inclusive Inclusive Inclusive Inclusivemmz

Pull (T$ 40 50 50 60 80

12

2 The use of sealing compound or resin is considered to besufficient for preventing a terminal from working loose,provided that the sealing compoundor resin isnot subjectto stressduring

normal use, and the effectiveness of the sealing compound or resin is not

impairedby temperaturesattainedby the terminalunderthemostunfavorable conditionsspecified in this standard.

Compliance is checked by inspection, by measurementand by the following test:

A solid rigid copper conductor of the largest cross-sectional area specified in Table 3 is placed in theterminal.

Screw and nuts are tightened and loosened five timesby means of a suitable test screwdriver or spanner,the torque applied when tightened being equal to thetorque shown in the appropriate column of Table 6 orin the table of the appropriate figures 34, 35 and 36

IS 1293:2005

whichever is the greater.

The conductor is moved each time the screw or nut isloosened.

Column 2 applies to screw without head if the screwwhen tightened does not protrude tiom the hole, andto other screws which cannot be tightened by meansof a screwdriver with a blade wider than the diameterof the screw.

Column 3 applies to other screws which are tightenedby means of a screwdriver and to screws and nutswhich are tightened by means other than a screwdriver.

Column 4 applies to nuts of mantle terminals whichare tightened by means of a screwdriver.

Where a screw has a hexagonal head with a slot, onlythe test with the screw driver is made with the torquevalues given in CO13.

Table 5 Composition of. Conductors(Clause 12.2.7)

Nominal-Cross Numbers of Wires and Nominal D!ameter ofWtresSectional Area

mm2~

Flexible Rigid Solid Rigid StrandedConductor Conductor Conductor

(1) (2) (3) (4)

0.75 24X 0.20

1.0 32X 0.20 1X1.13 7 X0.42

1.5 30x 0.25 1 x 1.38 ~ x 0.52

2.5 50x 0.25 1 X 1.78 7 X (3.67

4.0 56x 0.30 1 x 2.25 ~ x (-).86

6.0 84X ().30 1 X z.~(j 7x 1.05

10.0 1 x 3.57 7X1,35

Table 6 Tightening Torques for the Verification of theMechanical Strength of Screw-Type Terminals

(Clauses 12.2.6, 12.2.7, 12.2.8 and 24.1)

Nominal Diameter of Thread Torquemm

~

(1) (4)

Up to and including 2.8 0.2 0.4

Over 2.8 up to and including 3.0 0.25 0.5

Over 3.0 up to and including 3.2 0.3 0.6

Over 3.2 up to and including 3.6 0.4 0.8

Over 3.6 up to and including 4.1 0.7 1.2 1.2

Over 4.1 up to and including 4.7 0.8 1.8 1.2

Over 4.7 up to and including 5.3 0.8 2.0 1.4

,)

13

IS 1293:2005

During the test, terminals shall not work loose andthere shall be no damage, such as, breakage of screwor damage to the head slots (rendering the use of theappropriate screwdriver impossible), threads, washersor stirrups that will impair the further use of theterminals.

NOTES1 For mantle terminals the specific nominal diameter is thatof the slotted stud.2 The shape of the blade of the test screwdriver shall suit thehead of the screw to be tested.3 The screw and nuts must not be tightened in jerks.

12.2.9 Clamping screws or nuts of earthing terminalswith screw clamping shall be adequately locked againstaccidental loosening and it shall not be possible toloosen them without the aid of a tool.

Compliance is checked by manual test.NOTE In general, the design of terminals shown in Fig, 34,35,36 and 37 provide sufficient resiliency to comply with thisrequirement; for other designs, special provisions, such as, theuse of an adequately resilient part which is not likely to beremoved inadvertently, may be necessary.

12.2.10 Earthing terminals with screw clamping shallbe such that there is no risk of corrosion resulting fromcontact between these parts and the copper of theearthing conductor, or any other metal that is in contactwith these parts.

The body of earthing terminals shall be of brass orother metal no less resistant to corrosion, unless it is apart of metal frame or enclosure, when the screw ornut shall be of brass or other metal no less resistant tocorrosion.

If the body of the earthing terminals is a part of a frameor enclosure of aluminium alloy, precautions shall betaken to avoid the risk of corrosion resulting fromcontact between copper and aluminium or its alloys.

Compliance is checked by inspection.NOTE Screw or nuts shall be of plated steel withstandhrgthe corrosion test is consideredto be of a metsdno less resistantto corrosion than brass,

12.2.11 For pillar terminals, the distance between theclamping screw and the end of the conductor whenfully inserted, shall be at least that specified inFig. 34.

NOTEThe minimum dktance between the clamping screwand the end of the conductor applies only to pillar terminals inwhich the conductor cannot pass right through.

For mantle terminals, the distance between the fixedpart and the end of the conductor when filly inserted,shall be at least that specified in Fig. 37.

Compliance is checked by measurement, after a solidconductor of the largest cross-sectional area specifiedin Table 3, has been fully inserted and filly clamped.

12.3 Screwless Terminals for External CopperConductors

12.3.1 Screwless terminals maybe of the type suitablefor rigid copper conductors only or of the type suitablefor both rigid and flexible copper conductors.

For the latter type the test have to be carried out withrigid conductors first and then repeated with flexibleconductors.

NOTE This sub-clause ii not applicable to socket-outletprovided witi. screwless terminals requiring the fixing of special devices

to conductors before clamping them in the screwlessterminals, for example, flat push-on conductors,

screwless terminals requiring twisting of the conductors,for example, those with twisted joints; and

screwless terminals providing direct contact to theconductors by means of edges or points penetrating theinsulation.

12.3.2 Screwless terminals shall be provided withtwo clamping units, each allowing the properconnection of rigid or of flexible copper conductorshaving nominal cross-sectional areas as shown inTable 7.

When two conductors have to be connected, eachconductor shall be introduced in a separate independentclamping unit (not necessarily in separate holes).

Table 7 Relationship Between Rated Current and Connectable Cross-SectionalAreas of Copper Conductors for Screwless Terminals

(Clauses 12.3.2 and 12.3.10)

Rated Current Nominal Cross- ConductorsA Sectional Areas F

Diameter of Largest DiameterRigid Conductor Flexible

Conductormm2 mm mm

(1) (2) (3) (4)From 10 From 1.5 up to 2.13 2.21upto 16 2.5 inclusiveinclusive

14

IS 1293:2005

Compliance is checked by inspection and befitting clamping unit (not necessarily in separateconductors of the smallest and largest cross-sectional holes).areas specified.

It shall be possible to clamp securely any number of12.3.3 Screwless terminals shall allow the conductor conductors-up tothemaxfium as designed.to be connected without special preparation.

Compliance is checked by inspection and by test withCompliance is checked by inspection. the appropriate conductors (number and size).

NOTE The termspecialpreparationcoverssolderingofthe wires of the conductor, use of terminal ends etc, but not 12.3.8 Screwless terminals of fixed socket-outlets shallthe reshapingof the conductorbeforeits introductionintothe be designed so that adequate insertion of the conductorterminalor the twistingof a flexibleconductorto consolidate is obvious and over insertion is prevented, if furtherthe end. insertion is liable to reduce the creepage distances and/

12.3.4 Parts of screwless terminals mainly intended or clearances required in Table 23, or to influence thefor carrying current shall be of materials as specified function of the socket-outlets.in 26.5._ - NOTE For the purpose of this requirements, an appropriate

marktngindicatingthe length of insulationto be removed beforeCompliance is checked by inspection and by chemical the insertion of the conductor into the screwless terminals mayanalysis. be put on the socket-outletor given in an instructionsheet which

NOTE Springs,resilientunits,clampingplatesand the likeaccompanies the socket-outlet.

are not considered as part mainly intended for carrying current. Compliance is checked by inspection and by the test12.3.5 Screwless terminals shall be so designed that of 12.3.10.they clamp the specified conductors with sufficientcontact pressure and without undue damage to the

12.3.9 Screwless terminals shall be properly fixed to

conductor.the socket-outlet.

The conductor shall be clamped between metal They shall not work loose when the conductors are

surfaces. connected or disconnected during installation.

NOTE Conductorsareconsideredto beundulydarnagedif Compliance is checked by inspection and by the teststhey showappreciabledeep or sharp indentations. of 12.3.10.

Compliance is checked by inspection and by the testof 12.3.10. Covering with sealing compound without other means

of locking is not sufficient. Self-hardening resins may,12.3.6 It shall be clear how the insertion and however, be used to fix terminals which are not subjectdisconnection of the conductors is intended to be to mechanical stress in normal use.effected.

12.3.10 Screwless terminals shall withstand theThe intended disconnection of a conductor shall mechanical stresses occurring in normal use.require an operation, other than a pull on the conductor,so that it can be made manually with or without the Compliance is checked by the following test, which ishelp of a general purpose tool. carried out with uninsulated conductors on one

screwless terminals of each sample using a newIt shall not be possible to conti.ue the openings for the samples for each test.use of a tool to assist the connection or disconnectionwith the opening intended for the conductor. The test is carried out with solid copper conductor,

frost with conductors having the largest cross-sectionalCompliance is checked by inspection and by the test area, and then with conductors having the smallestof 12.3.10. cross-sectional area specified in Table 7.

12.3.7 Screwless terminals which are intended to be Conductors are connected and disconnectedused for the interconnection of two or more conductors Table 7 five times, new conductors being used eachshall be so designed that: time, except for the fifth time, when the conductors

a) during the insertion, the operation of the used for the fourth insertion are clamped at the sameclamping means of the one of the conductors is place. For each insertion, the conductors are eitherindependent of the operation of that for the other pushed as far as possible into the terminal or areconductor(s). inserted so that adequate connection is obvious.

{

b) during the disconnection, the conductor can bedisconnected either at the same time or

After each insertion, the conductor is subjected to pullof the value shown in Table 8. The pull is applied

separately; and without jerks, for 1 minute in the direction of thec) each conductor shall be introduced in a separate longitudinal axis of the conductor space.

15

IS 1293:2005

Table 8 Value for Pull Test for Screwless-Type Terminals

(Clause 12.3. 10)Rated Pull

Current NA

(1) (2)

10uptoand 30including16

During the application of the pull, the conductor shallnot come out of the screwless terminal.

The test is then repeated with rigid stranded copperconductors having the largest and smallest cross-sectional areas specified in Table 7. These conductorsare, however, inserted and disconnected only once.

Screwless terminals intended for both rigid and flexibleconductors shall also be tested with flexibleconductors, applying five connections anddisconnections.

For fixed socket-outlets with screwless terminals eachconductor is subjected for 15 min to a circular motion(1 O ~ 2) rev/rein using an apparatus, an example ofwhich is shown in Fig, 32. The conductor is subjectedto a pull having a value shown in Table 9.

During the test the conductor shall not move noticeablyin the clamping unit.

After these tests, neither the terminals nor the clampingmeans shall have worked loose and the conductors shallshow no deterioration impairing their further use.

12.3,11 Screwless terminals shall withstand theelectrical and thermal stresses occurring in normal use.

Compliance is checked by the following test (a) and(b), which are carried out on five screwless terminalsof socket-outlets which have not been used for anyother test.

Both tests have to be carried out with new copperconductors.

a) The test is carried out loading the screwlessterminals for one hour with an alternatingcurrent, as specified in Table 10, and connectingrigid solid conductors 1 m long having the cross-sectional area as specified in Table 10.The test is carried on each clamping unit.During the test the current is not passed throughthe socket-outle4 but only through the terminals.Immediately after this period the voltage dropacross each screwless terminal is measured withrated current flowing.In no case shall the voltage drop exceed 15 mV.The measurement shall be made across eachscrewless terminals and as near as possible tothe pla~e of contact.If the back connection of the terminals is notaccessible, the sample may be adequatelyprepared by the manufacturer, care shall betaken not to affect the behaviour of theterminals.Care shall be taken that, during the period ofthe test, including the measurements, theconductors and the measurement means are notmoved noticeably.

Table 9 Values for Flexing under Mechanical LevelTest for Copper Conductors

(Clauses 12.3.10 and 12.3.1 1)

Nominal Conductor Diameter of Height Mass forCross-Sectional Bushing HolelJ (H)2) Conductor

Areamm2 mm mm kg

(1) (2) (3) (4)0.5 6.5 260 0.30.75 6.5 260 0.4

1.0 6.5 260 0.4

1.5 6.5 260 0.4

2.5 9.5 280 0.74.0 9.5 280 0.9

6.0 9,5 280 1.4

10.0 9.5 280 2.0

0 If the bushing ho]e di~eter is not Iwge enough to ~co~odate the conductor without blndlng, a bushing having the next hirgel holesize may be used.z) folermce forheightH = l 15mm.

16

P,..!.

,.

Table 10 Test Current for the Verification ofElectrical and Thermal Stresses in

Nominal Use for Screwless Terminals(Clause 12.3.1 1)

Rated Test NominalCurrent Current Cross-SectionalArea

A A of the Conductor~ml

(1) (2) (3)

10 17.5 1.5

16 22 2.5NOTE For socket-outlet having a rated current lower than10A, the test current is proportionallydeterminedandthe cross-sectional area of the conductors is chosen equal to 1.5 mmz.

b) Screwless terminals already subjected to thedetermination of the voltage drop specified inthe previous test (a) are tested as follows.During the test, a current equal to the test currentvalue given in Table 10 is passed.

The whole test arrangement, including theconductors, shall not be moved until themeasurements of the voltage drop have beencompleted.

The terminals are subjected to 192 temperaturecycles, each cycle having a duration ofapproximately 1 h and being carried out asfollows: the current is flowing for approximately

30 rein; and

for a further 30 min approximately nocurrent is flowing.

The voltage drop in each screwless terminal isdetermined as prescribed for the test of (a) after every24 temperature cycles and after the 192 temperaturecycles have been completed.

In no case shall the voltage drop exceed 22.5 mV ortwo times the value measured after the 24th cycle,whichever is the smaller.

After this test an inspection by the normal or correctedvision without additional magnification shall show nochanges evidently impairing further use, such as,cracks, deformations or the like.

Furthermore the mechanical strength test accordingto 12.3.10 is repeated and all samples shall withstandthis test.

12.3.12 Screwless terminals shall be so designed thatthe connected rigid solid conductor remains clamped,even when the conductor has been deflected duringnormal installation, for example, during mounting ina box, and the deflecting stress is transferred to theclamping unit.

IS 1293:2005

Compliance is checked by the following test which ismade on three samples of socket-outlets which havenot been used for any other test.

The test apparatus, the principle of which is shown inFig. 33 A, shall be so constructed that:

a specified conductor properly inserted intoa terminal is allowed to be deflected in any ofthe 12 directions differing from each other by30 * 5.

the starting point can be varied by 10 and 20from the o;ginal point.NOTE A referenee direction need not be specified.

The deflection of the conductor from its straightposition to the testing position shall be effected bymeans of a suitable device applying a specified forceto the conductor at a certain distance from the terminal.

The deflection device shall be so designed that:

the force is applied in the direction perpendicularto the unreflected conductor;

the deflection is attained without rotation ordisplacement of the conductor within the clampinguni~ and

the force remains applied while the prescribedvoltage drop measurement is made.

Provisions shall be made so that the voltage drop acrossthe clamping unit under test can be measured whenthe conductor is connected, as shown, for example, inFig. 33 B.

The specimen is mounted on the f~ed part of the testapparatus in such a way that the specified conductorinserted into the clamping unit under test can be freelydeflected.

To avoid oxidation, the insulation of the wire shall beremoved immediately before starting the test.

NOTES1 If necessary,the hssertql conductormay be permrmenttybent aroundobstacles, so that these do not influence the resultsof the test.2 ln some cases, with the exeeption of the case of guidancefor the conductors, it maybe advisable to remove those partsof the samplewhich do not allow the deflection of the conductorcorrespondhg to the force to be applied.

A clamping unit is fitted as for normal use with a rigidsolid copper conductor having the smallest cross-sectional area specified in Table 11 and is submittedto a first test sequence; the same clamping unit issubmitted to a second test sequence using the conductorhaving the largest cross-sectional are% unless the fusttest sequence has failed.

The force for deflecting the conductor is specified inTable 12, the distance of 100 mm being measured from

17

,.. .

1

i

IS 1293:2005

the extremity, of the terminal, including the guidance,if any for the conductor, to the point of application ofthe force to the conductor.

The test is made with current flowing (that is, thecurrent is not switched on and off during the test); asuitable power supply should be used and a suitableresistance should be inserted in the circuit so that thecurrent variations are kept within + 5 percent duringthe test.

A test current equal to the rated current of the socket-outlet is passed through the clamping unit under test.A force according to Table 12 is passed to theconductor inserted in the clamping unit under test inthe direction of one of the 12 directions shown inFig. 33 A and the voltage drop across this clampingunit is measured. The force is then removed.

The force is then applied successively on each one ofthe remaining 11 direction shown in Fig. 33 Afollowing the same test procedure.

If at any of the 12 test directions the voltage drop isgreater than 25 mV, the force is kept applied in thisdirection until the voltage drop is reduced to a valuebelow 25 mV, but for not more than 1 min. After thevoltage drop has reduced a value below 25 mV, theforce is kept applied in the same direction for a firtherperiod of 30 s during which period the voltage dropshall not have increased.

The other two samples of socket-outlets of the set are

tested following the same test procedure, but movingthe 12 directions of the force so that they differ byapproximately 10 for each sample. If one sample hasfailed at one of the directions of application of the testforce, the tests are repeated on another set of sample,all of which shall comply with the repeated tests.

13 CONSTRUCTION OF FIXED SOCKET-OUTLETS

13.1 Socket-contact assemblies shall have sufficientresiliency to ensure adequate contact pressure on theplug pins.

Compliance is checked by inspection and by the testsof 9, 21 and 22.

13.2 Socket-contact and pins of socket-outlet shall beresistant to corrosion and abrasion.

Compliance is checked by inspection and accordingto 26.5.

13.3 Insulating linings, barriers and the like shall haveadequate mechanical strength.

Compliance is checked by inspection and by the testof 24.

13.4 Socket-outlet shall be so constructed as topermib

easy introduction and connection of the conductorsin the terminals;

Table 11 Nominal Cross-Sectional Areas of Rigid Copper Conductorsfor Deflection Test of Screwless Terminals

(Clause 12.3, 12)Rated Current Cross-Sectional Area of

of the Socket-Outlet the Test Conductormm2

A First Test Sequence Second Test Sequence

(1) (2) (3)56 1.0 1.5

10 1.5 2.5

Table 12 Deflection Test Forces(Clause 12.3.12)

Cross-SectionalArea of Force for Deflectingthe Test Conductor the Test Conductor 1,

mm2 N

(1) (2)1.0 0.251.5 0.52.5 1.0

II The forces me chosen so that they stress the conductors close to the timit Ofthe ela.$ticity.

18

easy fixing of the base to a wall or in a mountingbox;

correct positioning of the conductors;

adequate space between the underside of the baseand the surface on which the base is mounted orbetween the side of the base and the enclosure(cover or box) flush mounted so that, afterinstallation of the socket-outlet, the insulation ofthe conductors is not necessarily pressed againstlive parts of different polarity.

I For

NOTE This requirement does not imply that the metal partsof the terminals are necessarily protected by insulating barriersor insulating shoulders, from contact, due to incorrectinstallation of the terminal metal partwith the insulation of theconductor.

surface type socket-outlet to be mounted on amounting plate a wiring channel may be needed tocomply with this requirement.

In addition, socket-outlets classified as design A shallpermit easy positioning and removal of the cover orcover-plate, without displacing the conductors.

Compliance is checked by inspection and by aninstallation test with conductors of the largest cross-sectional area specified, for the relevant terminal size,in Table 3.

13.5 Socket-outlet shall be so designed that fullengagement of associated plugs is not prevented byany projection from their engagement face.Compliance is checked by determining that the gapbetween the engagement face of the socket-outlet andthe plug does not exceed 1 mm when the plug isinserted into the socket-outlet as far as it will go.

13.6 If covers are provided with bushings for the entryholes for the pins, it shall not be possible to removethem from the outside or for them to become detachedinadvertently from the inside, when the cover isremoved.

13.7 Covers, or cover-plates or parts of them, whichare intended to ensure protection against electric shock,shall be held in place at two or more points by effectivefixings.

Covers, cover-plates or parts of them maybe fixed bymeans of a single fixing, for example, by a screw,provided that they are located by another means (forexample, by a shoulder).

NOTES1 It is recommended that the fixings of covers or cover-platesbe captive.The use of tight fixing washers of cardboard or the like isdeemed to be an adequatemethod for securingscrews intendedto be captive,2 Non-earthed metal parts separated from live parts in such away that creepage distance and clearances have the values

IS 1293:2005

specified in Table 3, are not considered as accessible if therequirements oftbis sub-clause are met.

Where the fixing of covers or cover-plates of socket-outlets of design A serve to fix the base, there shall bemeans to maintain the base in position, even afterremoval of the covers or cover-plates.

Compliance with the requirements of safety andconstruction is checked according to 13.7.1, 13.7.2or 13.7.3.

13.7.1 For covers or cover-plates whose fixing are ofthe screw-type:

By inspection only.

13.7.2 For covers or cover-plates where fixing is notdependent on screws and where removal is obtainedby applying a force in a direction approximatelyperpendicular to the mounting/supporting surface(see Table 13):

where their removal may give access, with thestandard test finger, to live parts by the test of24.14;

when their removal may give access, with thkstandard test finger, to non-earthed metal partsseparated from live parts in such a way thatcreepage distance and clearances have the valuesspecified in Table 23 by the,tests of 24.15;

when their removal may give access, with thestandard test finger, only to:

.

l

.

.

insulating parts, or

earthed metal parts, or

metal parts separated flom live parts in such away that creepage distances and clearances havetwice the values specified in Table 23, orlive parts of safety extra-low voltrwe CSELV)circuits not greate~ than 25 V ac by tie tests o~24.16.

13.7.3 For covers or cover-plates whose fixing is notdependent on screws and Where removal is obtainedby using a tool, in accordance with the manufacturersinstructions given in an instruction sheet or in acatalogue: by the same tests of 13.7.2 except that thecovers or cover-plates or parts of them need not comeout when applying a force not exceeding 120 N indirections perpendicular to the mounting/supportingsurface.

13.8 A cover-plate intended for a socket-outlet withearthing contact shall not be interchangeable with acover-plate intended for a socket-outlet withoutearthing contact, if such interchange changes theclassification of the socket-outlet according to 7.1.2.

NOTE This requirement applies to accessories of the samemanufacturer.

19

IS 1293:2005

Table 13 Forces to be Applied to Covers, Cover-Plates or Actuating MembersWhose Fixing is Not Dependent on Screws

(Clause 13.7.2)

Accessibility with Tests Force to be Appliedthe Test Finger After AccordingRemoval of Covers, Socket-Outlets

~

Cover-Plates or to Sub- Socket-Outlets Socket-outletsParts of Them clauses Complying with not Complying with

24.17 and 24.18 24.17 and 24.18

Shall not Shall Shall not Shallcome off come off come off come off

(1) (2) (3) (4) (5) (6)

To live parts 24.14 40 120 80 120

To non-earthed metal parts separated 24.15 10 120 20 120from live parts by creepage distancesand clearances according to Table 23

To insulating parts, earthed metal 24.16 10 120 10 120parts, live parts of SELVs 25 V acor metal parts separated from liveparts by creepage distances twice

. those according to Table 23

Compliance with the requirements of 13.6, 13.7and 13.8 is checked by inspection and by an installationtest.

13.9 Ordinary surface-type socket-outlets shall be soconstructed that, when they are mounted and wired asfor normal use, there are no free openings in theenclosures other than the entry openings for the pinsof the plug.

Compliance is checked by inspection and by aninstallation test with conductors of the smallest cross-sectional area specified in Table 14.

NOTE Smallgaps betweenenclosuresand conduitsor cablesor between enclosures and earthing contacts, if any, areneglected.

13.10 Screws or other means for mounting the socket-outlet on a surface in a box or enclosure shall be easilyaccessible from the front. These means shall not serveany other fixing purpose.

13.11 Multiple socket-outlets with a common baseshall be provided with fixed links for theinterconnection of the contacts in parallel. The fixingof these links shall be independent of the connectionof the supply wires.

13.12 Multiple socket-outlets comprising separatebases shall be so designed that the correct position ofeach base is ensured. The fixing of each base shall beindependent of the fixing of the socket-outlet as a

whole to the mounting surface.

Compliance with the requirements of 13.10 to 13.12is checked by inspection.

13.13 The mounting plate of surface-type socket-outlets shall have adequate mechanical strength.

Compliance is checked by inspection after the testof 13.4 and by the test of 24.3.

13.14 Socket-outlet shall withstand the lateral strainimposed by equipment likely to be introduced intothem.

Compliance is checked by means of the device shownin Fig. 6.

Each specimen is mounted on a vertical surface withthe plane through the socket-contacts horizontal. Thedevice is then fully engaged and weight hung on itsuch that the force exerted is 5 N.

The device is removed after 1 min and the socket-outlet is turned through 90 on the mounting surface.The test is made four times, the socket-outlet beingturned through 90 after each engagement. During thetests, the device shall not come out.

After the tests, the socket-outlet shall show nodamage within the meaning of this standard; inparticular, they shall comply with the requirementsof 22.

20

IS 1293:2005

13.15 Socket-outlet shall not be an integral part oflamp holders.

Compliance is checked by inspection.

13.16 Socket-outlet other than ordinary shall betotally enclosed when fitted with screws conduits orwith polyvinyl chloride sheathed or similar type ofcables and without a plug in position.

Surface-type socket-outlet other than ordinary shallhave provisions for opening a drain hole at least5 mm in diameter, or 20 mmz in area with a width anda length of at least 3 mm.

If the position of the lid is such, that only one mountingpositioh is possible, the drain hole shall be effective

1

in that position. Alternatively the drain hole shall beeffective in at least two positions of the socket-outletwhen this is mounted on a vertical wall, one of thesewith the conductors entering at the top and the other

i

with the conductors entering at the bottom.

Lid springs, if any, shall be of corrosion resistantmaterial, such as, bronze or stainless steel.

Compliance is checked by inspection, by measurementand by the test of 16.2.

NOTES1 Total enclosurewhen the plug is not in position may beachieved by means of a lid.2 This requirement does not imply that the lid, if any, or theentry openings for the pins need be closed when the plug is notin position, provided that socket-outlets pass the relevant testfor the verification of the ingress of water.3 A drain hole in the back of the enclosure is deemed to beeffective only if the design of the enclosure ensure a clearanceor at least 5 mm from the wall, or provided a drainage channelof at least the size specified.

13.17 Earthing pins shall have adequate mechanicalstrength.

Compliance is checked by inspection and for pinswhich are not solid, by the test of 14.2 which is madeafter the test of 21.

13.18 Earthing contacts and neutral contacts shall belocked