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CONTENTS

1.0 Introduction

2.0 Custodian

3.0 Purpose

4.0 Application

5.0 Scope of Supply5.1 Power, control and earthing cables5.2 Cable glands5.3 Equipment not included in the scope of supply5.4 Definition of non-technical terms

6.0 Service and Environmental Conditions6.1 Ambient temperature for design purposes6.1.1 Air temperature6.1.2 Ground temperature6.2 Thermal resistivity of the ground or soil6.3 Rating of cables for site conditions6.4 Short circuit current withstand capability

7.0 International Reference Standards

8.0 General Requirements8.1 The Suppliers product range8.2 Origin of materials8.3 Project management8.4 Abbreviations of some technical terms used herein8.5 Suppliers drawings and documents

9.0 Design and Performance Requirements9.1 Voltage and frequency variations9.2 The electrical power system9.3 Conductor maximum continuous operating temperature9.4 Conductor maximum short-circuit operating temperature9.5 Short-circuit K values for copper conductors9.6 De-rating factors for cables laid in air9.7 De-rating factors for cables laid in ground9.7.1 Direct burial9.7.2 Use of ducts9.7.3 Pre-formed concrete trenches9.7.4 The use of lead sheathing9.8 Flame propagation, smoke production and toxic gas emission9.8.1 Flame propagation9.8.2 Smoke production and toxic gas emission9.8.3 Oxygen index9.9 Fire resistance9.10 Resistance to hot oils

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10.0 Construction Requirements10.1 Notation used in this document10.2 Conductors10.3 Conductor screening10.4 Conductor insulation10.5 Insulation screening10.6 Insulation screening tape10.7 Bedding between multi-cores10.8 Inner sheathing10.9 Armour10.10 General requirements10.10.1 Land-based installations10.10.1.1 Normal use in the air or in the ground10.10.1.2 Abnormal use in the air or in the ground10.10.2 Platform-based installations10.10.2.1 Normal use in the air10.10.2.2 LV cables in accommodation areas10.11 Outer sheathing10.11.1 Power distribution cables10.11.2 Earthing cables10.12 Other components10.12.1 Fire survival in non-accommodation areas10.12.1.1 HV cables10.12.1.2 LV cables10.12.2 Fire survival in accommodation areas10.12.2.1 HV cables10.12.2.2 LV cables10.12.3 Earthing cables10.12.4 Special applications10.13 Colours of components10.13.1 Conductors10.13.2 Outer sheathing colour10.13.3 Outer sheathing marking10.14 Cable glands10.14.1 Cable dimensional tolerances

11.0 Inspection

12.0 Testing12.1 General12.2 Type tests, sample tests and routine tests

13.0 Packing13.1 General13.2 Drum marking

14.0 Approval to Deviate

15.0 Revision History Log

16.0 Bibliography

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1.0 Introduction

This is an engineering standard that gives details of power, control and earth cables andassociated glands for high voltage and low voltage systems.

Note that any changes to this document from its last revision are highlighted by abold vertical bar to the left of each area of change. Should there be a need to consultthis documents change history log, refer in the first instance to its custodian (EE).References made throughout this guideline are numbered inside square brackets [ ] andmay be found in the Bibliography of section (16).

2.0 Custodian

The Custodian of this standard guideline is EE, who is responsible for the accuracy andquality of its contents and for its future revisions, where these are required to reflectindustry trends or changes to QGPC business practices.

3.0 Purpose

The purpose of this standard is to provide guidance to QGPC, their Consultants andContractors on the cables and accessories utilised by QGPC for voltages up to 33000Volts. This specification is based on QGPC Engineering Design Philosophy ES.2.03.0001and QGPC Electrical Installation Practices ES.2.06.0001.

4.0 Application

This standard shall be applied to the design, manufacture and testing of 33kV, 11kV,6.6kV, 3.3kV, and low voltage power, control and earthing cables to be installed forvarious projects of Qatar General Petroleum Corporation (QGPC).

5.0 Scope of Supply

5.1 Power, control and earthing cables

This specification details the requirements for industrial type, power distribution cables,control cables of the single and multi-core type and single core earthing cables.

The cables will normally be installed indoors, outdoors, in air and in the ground at QGPCoil and gas processing plants, refineries, chemical plants, LNG plants, off-shore platforms,industrial sites, and the like. This specification shall be used to purchase equipment forboth existing and new plants.

As a rule the requirements of this specification shall be adhered to. However, national andlocal regulations may exist in which some of their requirements are more stringent.

The Supplier shall inform the Principal in writing of any deviation from the technicalrequirements of this specification, preferably at the tendering stage, but certainly before themanufacturing commences. Otherwise the Principal will consider that the Suppliercomplies with these technical requirements and will be manufacturing the cableaccordingly.

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This specification covers the design, manufacture and testing of 33 kV, 11 kV, 6.6 kV, 3.3kV and low voltage power, control and earthing cables for various projects of QatarGeneral Petroleum Corporation (QGPC) in Qatar, Arabian Gulf

The requirements for drawings and documentation are given in section 8.5.

5.2 Cable Glands

Industrial type cable glands are recommended for terminating cables of single and multi-core type for all QGPC operations. Zone 2 classified areas may require the use of barriertype glands. The Principal shall specify these on the data sheets. Reference should also bemade to Engineering Philosophy ES.2.03.0001 Appendix H table H3.A and InstallationSpecification ES.2.06.0001 Section 16.4.

5.3 Equipment not included in the Scope of Supply

The following equipment shall be excluded from the scope of supply of cables and glandsof the SUPPLIER unless specified in other documents of the requisition.

Submarine cables.

Cable jointing equipment and splices.

Heat-shrink termination kits and equipment.

Terminating lugs and tools and test equipment.

Racking and trays.

Underground cables at a voltage higher than 33 kV.

5.4 Definition of Non-Technical Terms

For the purposes of this document the following definitions of terms and interpretationsshall apply regardless of any other meaning the words may have in other respects.

Shall. The word shall is to be understood as mandatory.

Should. The word should is to be understood as being strongly recommended.

Principal. Is the party, which initiates the project and ultimately pays for itsdesign and construction. The Principal will generally specify thetechnical requirements. The Principal may also include an agent orconsultant to act for the Principal.

Contractor(s). Is the party, which carries out all aspects or part of the design,engineering, procurement, construction and commissioning of the plant.The Principal may sometimes undertake all or part of the duties of theContractor.

Manufacturer Is the party which manufactures or suppliesor Supplier. equipment and services to perform the duties specified.

End-user. A third party that has already purchased the same equipment as thatbeing offered by the manufacturer, or supplier.

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Inspection. This shall be taken to mean a visual inspection of the equipment andinstallation.

Testing. This shall be taken to mean the routine tests normally carried out at thefactory of the Supplier.

Commissioning.This shall be taken to mean energisation and the final tests and checksat the Principals site subsequent to the energisation necessary toensure that each circuit satisfactorily performs its function.

Land-based All plants installed on the mainland of Qatar. All plants installed oninstallations Halul Island. Abbreviated to LBIs.

Platform-based All plants installed on elevated platforms or moored installations installations vessels located in the sea or waters around Qatar. Abbreviated to PBIs.

6.0 Service and Environmental Conditions

The atmosphere and ground throughout all QGPC plants shall be considered to becorrosive, as normally associated with oil and gas processing plants, refineries, chemicalplants, LNG plants, off-shore platforms, industrial sites, and the like. In addition, foroffshore and coastal locations, the atmosphere shall be considered as salt laden and theground as having a corrosive water table near its surface.

High humidity is experienced in all areas and condensation will occur on all equipmentduring some period of its lifetime.

6.1 Ambient Temperature for Design Purposes

6.1.1 Air Temperature

The ambient air temperature shall be considered as a maximum of 50 C. The Suppliershall take this into account in the design and selection of materials for his cables, and whencalculating and quoting de-rating factors for normal rated currents and fault currents of thecables.

The Supplier shall quote his nominal temperature for which his de-rating factor forambient temperature is 1.0 in his tender documentation.

6.1.2 Ground Temperature

The ambient ground temperature shall be considered as a maximum of 40C.

6.2 Thermal Resistivity of the Ground or Soil

The thermal resistivity of the ground or soil shall be taken as 2.5 K m/W for generalguidance. Soil tests should be taken at all sites to identify areas where the thermalresistivity is likely to be higher than 2.5 K m/W e.g. well-drained sand where heavily loadedcables are to be buried and operated continuously in the summer.

6.3 Rating of the Cables for Site Conditions

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The cable manufacturer shall not be responsible for sizing the cables for normal currentconditions for a particular project.

6.4 Short Circuit Current Withstand Capability

The Supplier shall provide detailed information in his tender documents for the I-squared-t short circuit current withstand capability which is applicable over the timerange of 0.2 to 10.0 seconds. This information shall be given in the form of equations orgraphs for: -

a) The conductors.

b) The armouring wires or braid.

7.0 International Reference Standards

The following standards and specifications shall be used unless the Principal approvesanother national standard: -(Add to all references e.g. IEC 34 becomes IEC )60034

StandardCompliance

IEC 43 Recommendations for alternating current watt-hour meters.

IEC 92-3 Electrical installations in ships.Part 3: Cables (construction, testing and installation) wires or cables.

IEC 183 Guide to the selection of High Voltage Cables

IEC 189 Copper conductors.

IEC 331 Fire resisting characteristics of electric cables.

IEC 332 Tests on electric cables under fire conditions.

IEC 502-1 Extruded solid dielectric insulated power cables for rated voltages from1 kV up to 30 kV.

IEC 540 Test methods for insulations and sheaths for electric cables and cords(elastomeric and thermoplastic compounds).

IEC 754 Tests on gases evolved during combustion of electric cables.

IEC 885 Electrical test methods for electric cables.

BS 2621 Mechanical cable glands.

BS 2782 Methods of testing plastics.

BS 5467 Armoured cables with thermosetting insulation for electricity supply.

BS 5468 Cross-linked polyethylene insulation systems of electric cables.BS 6004 PVC insulated cables (non-armoured) for electric power and lighting.

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BS 6346 PVC cables for electricity supply as relevant to the contract cables withXLPE insulation.

BS 6360 Copper conductors in insulated cables and cords.

BS 6425 Test on gases evolved during the combustion of materials from cables.

BS 6746 Specification for PVC insulation and sheath of electric cables

BS 7211 Non armoured cables for power and lighting with low emission ofsmoke/gases

8.0 General Requirements

8.1 The Suppliers Product Range

It is a general requirement that the supplier offers only cable that is within his standardrange of cables. Any cable that is bought-in from a third party shall also be from astandard range of products from the third party, but subject to the approval of thePrincipal. The cable shall not be a new product-line that has not been sold in reasonablequantities to similar end-users as QGPC. The Supplier shall include in his quotation a listof end-users in the Middle East region that have purchased the same cable being offered.

8.2 Origin of Materials

The Supplier shall offer all the cables in the purchase order from his own factory in onecountry; preferably the country where the purchases order will be managed by theSupplier. Type Test certificates shall be in the name of the Supplier for the cable, and notin the name of a third party manufacturer or vendor. The Supplier shall confirm thisparagraph in his quotation.

8.3 Project Management

The Supplier shall nominate a single person to manage the project and this person shall bethe single focal point for all discussions, meetings, communications, correspondence, andthe like, between the Supplier and the Principal.

8.4 Abbreviations of Some Technical Terms Used Herein

The definitions for some technical words and abbreviations used in this specification andthe QGPC M.E.S.C. system are: -

DATA SHEETS This includes all relevant data sheets, diagrams and drawings issuedwith the enquiry or purchase order package.

AWA Aluminium wire armour

CSP Chloro-sulphonated polyethylene

COR CU Corrugated copper

CU Un-tinned copper

CUWB Copper wire braid

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EMA Ethylene methyl acrylate

EPDM Ethylene propylene diene monomer

EPR Ethylene propylene rubber

EVA Ethylene vinyl acetate

FLEX Flexible

GSWA Galvanised steel wire armour

GSWB Galvanised steel wire braid

HCL Hydrochloric acid or gas

HOFR Heat and oil resisting, flame retardant

IS Intrinsically safe

LDF Low density foam

LSLH Low smoke low halogen

MI Mineral insulated

MT Mica glass tape

NBR Nitrile butadiene rubber

PBWB Phosphor bronze wire braid

Pb Lead sheathing

PbCU or TCU Tinned copper

POL Polyethylene

PTP Polyethylene terephthalate

PTFE Polytetra fluoro ethylene

PVC Polyvinyl chloride

PVDF Polyvinyldiene fluoride

SCR Screened

SOL CU Solid copper

STR CU Stranded copper

SWA Steel wire armour

XLPA Cross linked polyalkylene

XLPE Cross linked polyethylene

M.E.S.C Material and Equipment Stores Catalogue (Shell)

IEC International Electrotechnical Commission.

BSI British Standards Institution.

S.I. System International.

RMS Root mean square value of current or voltage.

Pk Peak value of instantaneous current or voltage.

A.C. or a.c. Alternating current or voltage.

D.C. or d.c. Direct current or voltage.

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Hz Frequency of alternating current or voltage in cycles per second.

FAT Factory acceptance testing.

HV High voltage, above 600 volts.

LV Low voltage, 51 volts to 599 volts.

C Degrees Celsius

SCADA System control and data acquisition.

DCS Distributed control system

8.5 Suppliers Drawings and Documents

All drawings and documents shall be expressed in the English language and units ofmeasure shall be generally in accordance with the S.I. system.

The Supplier shall submit with his tender documents cross-sectional area drawings toillustrate the proposed construction of all the types of cables being offered. Thesedrawings shall also indicate the dimensions and diameters of the main components e.g.: -

* Outside diameter of the outer sheathing.* Inside diameter of the outer sheathing.* Outside diameter of the armouring.* Inside diameter of the armouring.* Outside diameter of the inner sheathing.* Inside diameter of the inner sheathing.* Outside diameter of the conductor insulation including the semi-conductor screening if

provided.* Outside diameter of each conductor.

The dimensions, and their tolerances, may be shown in tabular form instead of in thedrawings.

9.0 Design and Performance Requirements

9.1 Voltage and Frequency Variations

The cables shall operate correctly, continuously and without being overloaded when thePrincipals nominal system voltages deviate by plus or minus 10 % for long periods oftime. Likewise when Principals nominal system frequency deviates by plus or minus 5%.The worst cases of simultaneous variation of voltage and frequency shall be withstood bythe cables.

9.2 The Electrical Power System

The Principal shall state the rated power system voltage and frequency on the data sheets.

9.3 Conductor Maximum Continuous Operating Temperature

The conductor maximum continuous operating temperature shall be no greater than thatgiven by the Supplier of the cables when the current has been reduced by the appropriatede-rating factors for the project, see 9.6, 9.7. The Supplier shall clearly state the value ofthe conductor maximum continuous operating temperature in his tender

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documentation. This temperature should not exceed the value given below for typicaldesigns of power cables: -

Insulation material Maximum continuousconductor temperature

C

Paper 65PVC 70EPR 90XLPE 90

9.4 Conductor Maximum Short-Circuit Operating Temperature

The conductor maximum short-circuit operating temperature shall be no greater than thatgiven by the Supplier of the cables. The Supplier shall clearly state the value of theconductor maximum continuous operating temperature in his tender documentation.This temperature should not exceed the value given below for typical designs of powercables: -

Insulation material Maximum short-circuitconductor temperature

C

Paper (compression connections) 250Paper (lead solder connections) 160PVC < 300 mm2 160PVC > 300 mm2 140PVC > 6600 V 140EPR 250XLPE 250

9.5 Short Circuit K Values for Copper Conductors

The short circuit K values for use in I-squared-t calculations, for copper conductorssurrounded by different insulation materials, armouring and sheathing, shall be taken asguidance to be: -

Insulation material Short-circuit K value A-secs0.5/mm2

Paper (compression connections) 250Paper (lead solder connections) 160PVC < 300 mm2 150PVC > 300 mm2 130PVC > 6600 V 130EPR 250XLPE 250

The time duration of the full fault current shall normally be no less than one second, unlessthe cable is protected by fast acting fuses in which case the fusing time shall be taken intoaccount.

9.6 De-rating Factors for Cables laid in Air

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The cables may be laid on racks, trays or ladders in the vertical or horizontal plane andwith various bunching arrangements. The Supplier shall provide de-rating factors for hiscables for these laying situations, preferably in the form of numerical tables.

9.7 De-rating Factors for Cables laid in Ground

9.7.1 Direct Burial

The cables may be laid directly in the ground at various depths and with various bunchingarrangements. The Supplier shall provide de-rating factors for his cables for these layingsituations, preferably in the form of numerical tables.

9.7.2 Use of Ducts

The cables may be laid inside ducts in the ground at various depths and with variousbunching arrangements. This is normally needed for road crossings. The Supplier shallprovide de-rating factors for his cables for these laying situations, preferably in the form ofnumerical tables.

9.7.3 Pre-Formed Concrete Trenches

The cables may be laid in pre-formed concrete trenches in the ground at various depths andwith various bunching arrangements. These trenches will be filled with still air and may beprovided with racking and supports, and concrete lids will be used to close the trench. TheSupplier shall provide de-rating factors for his cables for these laying situations, preferablyin the form of numerical tables.

9.7.4 The Use of Lead Sheathing

For special situations e.g. tank farms, chemical plants, the Principal shall specify a leadouter sheathing for the cable to protect the cable from chemical attack. The effect of thelead sheathing should be taken into account in the de-rating factors for buried cables.

9.8 Flame Propagation, Smoke Production and Toxic Gas Emission

9.8.1 Flame Propagation

All cables shall be constructed with materials that are of the Reduced Propagation of Firetype. The method of test and test configuration used to demonstrate the capability shouldbe as defined by IEC 332 Tests on electric cables under fire conditions.

9.8.2 Smoke Production and Toxic Gas Emission

The cable materials shall be chosen such that the hazard of smoke and toxic gas emission(e.g. Hydrochloric acid gas, halogens) during a fire shall be minimised. The data to be usedshall be taken from IEC 332-2.

9.8.3 Oxygen Index

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The oxygen index of all non-metallic materials except the insulation shall be not less than30 as described in BS 2782 or IEC 754.

9.9 Fire Resistance

Specified cable circuits and routes will utilise cables that shall have a continued electricalperformance under fire conditions, e.g. emergency shutdown systems and their powersupplies. The method of test to be used to demonstrate this capability should be as definedby IEC 331-1. This will be achieved by means of glass mica tape applied over theconductors in the form of a helix.Mineral Insulated Copper Cables (MICC) are prohibited for use for vital services.

9.10 Resistance to Hot Oils

Cables that are required to operate where there is oil present shall be certified for oilimmersion test recommended by the Supplier

10.0 Construction Requirements

10.1 Notation Used in This Document

The generally accepted construction of the cable components is defined in this document asfollows in a LHS to RHS format: -

* Conductor / insulation / armouring / outer sheathing

An example of which is: -CU / XLPE / SWB / CSP

There will be other components for particular applications e.g. system voltages above 3300volts where semi-conducting screening may be needed for electric stress relieving.

10.2 Conductors

The conductors shall be made of high purity electrolytic copper in accordance with BS6360. The Principal shall specify that the conductors shall be tin-coated where this isnecessary for special situations. Aluminium shall not be used.

The Principal shall specify that the conductors shall be finely stranded where this isnecessary for special situations.

The conductors shall be circular in section, stranded, annealed copper conductors. Sectorshaped conductors shall not be used.

The conductors of multicore cables shall be laid up with solidly extruded non-fibrous, non-hygroscopic fillers to form a compact circular cable.

10.3 Conductor Screening

The conductors for cables in which the phase-to-ground operating voltage is greater than3600 volts RMS for PVC or XLPE insulation or 6000 volts RMS for EPR insulation shallbe provided with a semi-conductor screen, which shall be bonded to the inner surface of theinsulation.

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The Supplier shall confirm the need for this screening and describe how it is bonded to theinsulation.

10.4 Conductor Insulation

The insulation material shall be extruded over the conductor and be PVC, XLPE or EPRas stated in the data sheets for the project. EPR shall only be used for operating line-to-linevoltages up to 6600 volts RMS.Insulation grades for various service voltages shall be as follows: -

System Voltage Rated Voltage/Nominal System VoltsHighest Voltage(U) (U0/U) (Um)

33kV system 18kV/30kV 36kV11kV system 6kV/10kV 12kV6.6kV system 3.6kV/6kV 7.2kV3.3kV system 1.8kV/3kV 3.6kV440V system 600V/1000V415V/240V system 600V/1000V380V/220V system 600V/1000V

10.5 Insulation Screening

The insulation of conductors for cables in which the phase-to-ground operating voltage isgreater than 3600 volts RMS for PVC or XLPE insulation or 6000 volts RMS for EPRinsulation shall be provided with a semi-conductor screen, which shall be bonded to theouter surface of the insulation.

The Supplier shall confirm the need for this screening, and describe how it is bonded to theinsulation and how it should be removed during the termination of the cable e.g. stripping.

10.6 Insulation Screening Tape

A copper tape wound in an over-lapped helical manner shall cover the insulation screening.Aluminium shall not be used.

The Principal shall specify that the copper tape shall be tin coated where this is necessaryfor special situations.

10.7 Bedding Between Multi-Cores

Bedding shall be included in the design of the cable to ensure that the cable is robust andfirm, and that passages are not present that could allow gases to be transmitted along thecable. The bedding shall also ensure that the overall diameter of the finished cable isconstant (subject to the tolerances given in the appropriate IEC standard) throughout theperiphery of the cable.

Good roundness is an essential requirement.

10.8 Inner Sheathing

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An inner sheath shall be provided over the bedding and insulation. For HV cables it shallbe resistant to ozone, electric discharge and surface tracking.The inner sheath and fillers shall provide a good longitudinal seal against humidity, gasand vapours.

10.9 Armour

Armouring shall be provided except for special applications.

The Principal shall clearly state on the data sheets whether armouring is not required.

The Principal shall clearly state on the data sheets type of armouring that is required, e.g.wires in single or double layers, braid, galvanised steel, tinned copper, aluminium, bronze,stainless steel. See 10.9.1 and 2.

Aluminium, tinned copper or bronze wires or braid shall be used for single cables, asstated on the data sheets.

The armouring shall be highly conductive for fault currents and the addition of somecopper wires or strands in the armouring may be necessary to reduce the armouringimpedance for long lengths of cables in sensitive situations. The Principal should call forthis requirement if it is needed in the project documentation.

a) Armour shall provide mechanical protection (except those specified in the data sheet).The armour shall be of single galvanised steel wire.

b) Galvanised steel wire braid shall be used for flexible cables and cables up to andincluding 10 mm2.

c) The thickness of steel wire shall comply with IEC 502.d) Particular consideration shall be given to the problem of armour becoming embedded

in the inner sheath making separation for termination difficult.e) A stick-proofed tape shall be provided between the inner sheath and the braid.

10.10 General Requirements

Cables shall have Oxygen Index greater than 30 and acidic emission less than 17%.

Maximum crosssectional area for multicore cable shall be limited to 240 mm2.

Cables for offshore installations shall be low smoke low halogen types (LSLH).

Cables to be used on HV circuits shall be cross-linked polyethylene (XLPE) insulated,steel wire armoured, UV stabilised, PVC oversheath, construction having flame retardantdesign in accordance with IEC 332 3 Cat. A.

LV cables for use on vital circuits shall be of fire resistant design in accordance with IEC331. Cables meeting this requirement will be of cross-linked polyethylene (XLPE)insulated, steel wire armoured or braided, UV stabilised, PVC oversheath construction.

10.10.1 Land-Based Installations

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10.10.1.1 Normal use in the air or in the ground

The cable construction shall be: -

For multi-cores cablesCU / XLPE / GSWA / PVC or CU / XLPE / GSWA / XLPE

For single-core cablesCU / XLPE / PBWB / PVC or CU / XLPE / PBWB / XLPE

For single-core cables in air (not in ground)CU / XLPE / AWA / PVC or CU / XLPE / AWA / XLPE

10.10.1.2 Abnormal use in the air or in the ground

In abnormal situations (e.g. where oil spillage is expected) the cable construction shallincorporate a lead sheath: -

For multi-cores cablesCU / XLPE / PVC / Pb/ PVC or CU / XLPE / XLPE / Pb / XLPE

For single-core cablesCU / XLPE / PVC / Pb / PVC or CU / XLPE / XLPE / Pb / XLPE

Due considerations shall be given while using Lead Sheathed Cables. These cables shall beused only for those locations where spillage of oil/hydrocarbons/chemicals is expected.

10.10.2 Platform-Based Installations

10.10.2.1 Normal use in the air

LV cables shall be cross-linked polyethylene (XLPE) insulated, galvanised steel wirearmoured (or braided for < 10 mm2.), UV stabilized, PVC oversheath construction havingflame retardant design in accordance with IEC 332-3 Cat A. Ethylene Propylene Rubber(EPR) with Chloro-sulphonated Polyethylene (CSP) oversheath is also acceptable.

The cable construction shall be: -

For multi-cores cables where flexibility or oil resistance is requiredCU / XLPE / CSP / GSWB / CSP or CU / EPR / CSP / GSWB / CSP

For multi-cores cables in general useCU / XLPE / PVC / GSWA / PVC or CU / EPR / PVC / GSWA / PVC

For single-core cables where flexibility or oil resistance is requiredCU / XLPE / CSP / PBWB / CSP or CU / EPR / CSP / PBWB / CSP

For single-core cables in general useCU / XLPE / PVC / AWA / PVC or CU / EPR / PVC / AWA / PVC

10.10.2.2 LV Cables in Accommodation Areas

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The EPR insulation shall be covered with an inner sheath of EMA or an acceptablealternative material.

The armouring shall be covered with an outer sheath of EMA or an acceptable alternativematerial.

The cable construction shall be: -

For multi-cores cablesCU / EPR / EMA / GSWB / EMA

For single-core cablesCU / EPR / EMA / PBWB / EMA

10.11 Outer Sheathing

10.11.1 Power Distribution Cables

An outer sheath shall be extruded over the armouring, and lead sheathing if used. Theoversheath shall be PVC with the necessary additives to obtain the followingcharacteristics: -

a) Flame retardant (IEC 332-3 Category A)b) Minimum production of noxious gases and fumes in the event of fire (less than 17%

release of acidic emissions).c) Proof against aliphatic hydrocarbons

10.11.2 Earthing Cables

Earthing cables shall be insulated as described in 10.12.3 and the insulation material shallbe coloured green and yellow.

10.12 Other Components

The Supplier shall describe in his tender documentation any other components thatform part of the cable design, and their purpose, for example mica tape for fireresistance.

10.12.1 Fire Survival in Non-Accommodation Areas

10.12.1.1 HV Cables

HV cables should be considered to have sufficient material in their insulation to withstandfire conditions for the short period of time during which the HV system will shut down andthe emergency systems start-up and supply the essential and vital services.

10.12.1.2 LV Cables

The conductors shall be wrapped with mica tape.

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The insulation shall be covered with an inner sheath of EPDM or an acceptable alternativematerial.

The cable construction shall be: -

For multi-cores cables where fire resistance is requiredCU / MT / XLPE / EPDM / GSWB / CSP orCU / MT / EPR / EPDM / GSWB / CSP

For single-core cables where fire resistance is requiredCU / MT / XLPE / EPDM / PBWB / CSP orCU / MT / EPR / EPDM / PBWB / CSP

10.12.2 Fire Survival in Accommodation Areas

10.12.2.1 HV Cables

As for 10.12.1.1

10.12.1.2 LV Cables

The conductors shall be wrapped with mica tape.

The insulation shall be covered with an inner sheath of EMA or an acceptable alternativematerial.

The armouring shall be covered with an outer sheath of EMA or an acceptable alternativematerial.

The cable construction shall be: -

For multi-cores cables where fire resistance is requiredCU / MT / EPR / EMA / GSWB / EMA

For single-core cables where fire resistance is requiredCU / MT / EPR / EMA / PBWB / EMA

10.12.3 Earthing Cables

For cables used for earthing and bonding structures, frames, vessels etc., Theirconstruction shall be: -

For general useCU / PVC

For increased flexibility and resistance to oil is requiredCU / EPR / CSP

10.12.4 Special Applications

The Principal should be consulted for special applications, e.g. drilling rigs, down holepumps, drag chains, where the working conditions require flexible conductors, oil and mud

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resistance, chemical contamination, extra protection against mechanical damage, prolongedexposure to high temperatures, extra large conductor sizes, submarine cables, cables withvoltages in excess of 100 kV where special cross-bonding of armouring is necessary, etc.

10.13 Colours of Components

10.13.1 Conductors

Number of Colour Numberingphase andneutral cores

1 Black (or natural) Not applicable

2 Red, Black 1 and 2

3 Red, Yellow, Blue 1, 2 and 3

4 Red, Yellow, Blue, Black 1, 2, 3 and 4

more than 4 White with black numbers 1, 2, 3, 4, 5, etc.

10.13.2 Outer Sheathing Colour

Service voltage Colour Volts

33000 Red

11000 Red

6600 Red

3300 Red

600/1000 Black

Power control Grey preferred, black acceptable cables

10.13.3 Outer Sheathing Marking

The manufactures name and voltage grade shall be permanently marked or embossed onthe surface of the outer sheathing at intervals of approximately 3 metres along the totallength of the cable. For the earthing cables in 10.12.3 this requirement is unnecessary.

10.14 Cable Glands

Cable glands shall be manufactured and tested to the requirements of BS6121 as EExd,EExe and Industrial glands shall be nickel plated brass.

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Entry threads shall be metric x 1.5mm pitch as standard.

The length of entry thread into EExd II flameproof equipment, which must be threaded,shall be as detailed in BS EN 50018.

Cadmium plated brass glands are not acceptable throughout QGPC.

10.14.1 Cable Dimensional Tolerances

Cable gland selection shall be done in accordance with cable dimensions supplied by thecable manufacturer. The corresponding gland sizes are selected from the Glandmanufacturer selection charts. Glands are manufactured to cover a range of cable sizes.The gland selected should be based on the following procedure: -a) Determine the requirements, i.e. EExd, EExe, or Industrialb) Choose appropriate gland type, i.e. indoor, outdoor, armoured or unarmoured.c) Check armour size and type.d) Select gland size using inner sheath diameter of cable.e) Check outer seal will accept cable outside diameterf) Check entry thread size.

11.0 Inspection

The Principal or his nominated representative shall inspect cables.

The Supplier shall allow the Inspector all reasonable access to his factory anddocumentation at any times during manufacture of the cables. The Inspector shall give noless than 10 days notice for pre-planned inspection visits. The scope of Inspection shall beagreed in advance between the Principal and the Supplier.

Approval of the Inspector shall not relieve the Supplier of his responsibilities under theterms of the purchase and this specification and its accompanying documents.

12.0 Testing

12.1 General

The manufacturer shall have a QA/QC system based on ISO 9000 9004 controlling thequality of design and assembly work during all stages of the production process.

A test program shall be established to demonstrate that each cable types will performsatisfactorily in service.

Testing shall be performed in accordance with written test procedures prepared by theSupplier and reviewed by the Principal. These procedures shall include provisions forassuring that the pre-requisites for a given test have been met and that the test is performedunder suitable environmental conditions by appropriately trained personnel using recentlycalibrated instrumentation.

12.2 Type Tests, Sample Tests, Routine Tests

The material supplied shall be subject to full works tests in accordance with the relevantsections of the Standards as applicable to the material supplied

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The following tests shall be effected: -

12.2.1 Type Tests

Tests which are required to be carried out by the manufacturer to prove compliance withthe quoted specifications and standards.

Witnessing of these tests is not normally required, but certification of proof is to beprovided for the tests, which are as follows: -

12.2.1.1 Oil Immersion Test

Utilising Cleanspot and the existing Sterling Test Rig, in addition to a normalimmersion test.

12.2.1.2 Ageing Test

12.2.1.3 Water absorption

12.2.1.4 Tinning Tests on Conductors

12.2.1.5 Galvanising Tests on Armouring

12.2.1.6 Material Tests Insulation and Sheath

12.2.1.7 Ozone Resistance

12.2.1.8 Resistance to Abrasion

12.2.1.9 Stripping Test

12.2.1.10 Bend Test

12.2.1.11 Full witnessed tests to IEC 502 for the High Voltage 33kV /6.6kV/3.3kV screened cables

12.2.2 Sample Tests

12.2.2.1 Reduced Propagation to IEC 332 Part 3, Category A.

12.2.2.2 Fire withstand test to IEC 331.

12.2.2.3 Smoke Emission to Appendix 1 of Sterling Report No. 117, which is based on the IEC 332 Part 2.

12.2.2.4 Oxygen Index.

12.2.2.5 Temperature Index.

12.2.3 Routine Tests

Tests to be carried out at regular intervals on each cable. Tests and records will be witnessed during inspection visits.

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12.2.3.1 Visual Examination

12.2.3.2 Marking

12.2.3.3 Dimensions

12.2.3.4 Conductor Resistance

12.2.3.5 HV Test

12.2.3.6 Partial Discharge

12.2.3.7 Insulation Resistance

12.2.3.8 IS Cable Tests (including check of capacitance, inductance, and L/R ratio)

12.2.3.9 Bending Test

13.0 Packing

13.1 General

The Supplier shall deliver the cables on wooden drums. Each wooden drum shall be in verygood condition before the cable is wound onto it.

The drum shall fully protect the cable, both radially and peripherally. Only one cable shallbe wound on a drum. The smallest drum shall be used to contain the cable. The drum shallbe returnable to the Supplier after the Principal has finished using it. The Supplier shallmake all the necessary arrangements for the removal of drums from the QGPC site.

The drum shall be protected to give adequate protection during shipment to the QGPC site,in accordance with the particular requirements of QGPC the details of which will be foundin the purchase order documentation.

13.2 Drum Markings

The Supplier shall mark the drums with at least one indelible label. The label shall besecured inside a waterproof but transparent plastic pocket. The pocket shall be nailed orscrewed to the face of the drum at a place where it can be easily seen. The language to beused on the label shall be English. At least the following information shall be printed on thelabel: -

* Manufacturers name, address, telephone number, fax number, and telex number.* Manufacturers purchase order number and details.* Manufacturers cable type details.* QGPCs purchase order number and details.* QGPCs M.E.S.C reference number.* Date of manufacture.* Voltage grade.* Cable cross-section construction abbreviations, see 10.1.* Total length of the cable.* Total weight of the cable.* Unique drum number.

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14.0 Approval to Deviate

Strict compliance with this standard guideline is required. Any deviation must obtain priorwritten approval from its custodian.

15.0 Revision History Log

A record or log shall be kept of the revision history of each engineering document, and beincorporated in the documents accompanying electronic readme file [5]. In this way,there should be no need for a history log to be included in a document - only details of itslatest approved revision need be shown (note that the readme file will contain informationabout the particular operating system + application software versions which were used tocreate the documents electronic file; it can also include help pages in the form ofbackground notes and explanations, where such details are considered of benefit to itsreader).

The following is recommended for the contents of a documents revision history log:-

Revision Number 0,1,2,3, etc.Prepared By/Date Name or reference indicator and date (ddmmmyy)Checked By/Date Name or reference indicator and date (ddmmmyy)Approved By/Date Name or reference indicator and date (ddmmmyy)Reason For ChangeShort description, with change request reference if availableRelease/Date Release/transmittal reference and date (ddmmmyy)

16.0 Bibliography

[1] ISO216: 1989, 1st Edition Writing Paper and Certain Classes of Printed Matter -Trimmed Sizes - A and B Series

[2] ES.0.10.0001, Rev 0 Standard Database - Key Words & Phrases[3] ES.0.10.0002, Rev 0 Standard Database - Acronyms[4] ES.0.07.0010, Rev 0 Engineering Document Classifications[5] ES.0.06.0021, Rev 0 Electronic ReadMe Files

At the time of publication of this standard the revision of each of the above references,as they cross-relate to the revision of this document, were valid. As all references aresubject to change from time to time, the reader is required to first check with thecustodian of this document to find out the latest cross-revision status with respect tothe above bibliographic list.