Download - Domestic Wiring
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ENGINEERING LAB 1ENGINEERING LAB 1DOMESTIC WIRINGDOMESTIC WIRING
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Course OutcomeCourse Outcome• CO1: Design schematic
drawing for domestic wiring.
• CO2: Practice right domestic wiring installation.
• CO3: Validate electrical parameter using testing equipment.
• CO4: Apply right attitude and safety procedure.
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SAFETYSAFETY&&
5 S5 S
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Safety in Wiring Lab & Safety in Wiring Lab & WorkshopWorkshop
• Obey the signage and work instructions given by instructors in the lab.
• Always wear a pair of safety shoes when enter the lab. (slippers or sandals are not allowed!!)
• Wear suitable costume and Personal Protective Equipment (PPE) for wiring/installation job.
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Safety in Wiring Lab & Safety in Wiring Lab & WorkshopWorkshop
• Use a test pen for electrical current absence testing under 500V life line.
Screw driver is not a tester!!
• Don’t touch any bare life parts or conductor lines when the current is supplied!!
!
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Safety in Wiring Lab & Safety in Wiring Lab & WorkshopWorkshop
• Use an appropriate Fire Extinguisher when fire happened and follow the firing procedure.
• Inform the instructor/s as soon as possible when accident or uncertainty condition happened.
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Safety in Wiring Lab & Safety in Wiring Lab & WorkshopWorkshop
• Inform the instructor/s as soon as possible when accident or uncertainty condition happened.
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PPEPPE
• Hand gloves– Wear to protect hand
from sharp edge and easy handling of certain goods
• Safety shoes– Wear to protect foot from
hitting by heavy/sharp edge/objects and prevent shock current
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Safety PrecautionSafety Precaution• Isolation
o All of circuit installation must have a method to isolate the main supply from loads
o Installation and isolation must be easy to see• Fuse
o An appropriate fuse rate must be used to protect loads and user from over leakage current
• Earthing / groundingo All of metal/G.I. and auto transformer parts must be
grounded o All of earthing duct must be strong enough
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Safety PrecautionSafety Precaution
NEVER WORK ON EQUIPMENT WITH THE POWER TURNED ON!
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Electrical Safety & RegulationElectrical Safety & Regulation
a. Occupational Health & Safety (OS&H)b. Occupational Safety & Health Act
(OSHA)-Electrical Safetyc. Effect of electric current on the human
bodyd. Safety Tools & Equipmentse. Safety in Electrical Lab/Workshop
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Electrical Safety & RegulationElectrical Safety & Regulation• OH&S is a major field of study about health and safety
encompassing a wide range of field include education, training, engineering, management, science, medicine, legislation/litigation and all types of work
• Roles of safety for electrical workers:– Must carry out all work safely and observe all measures
necessary to protect from hazards– Must ensure that the electrical system and equipments installed
and maintain in safe and remain safe for all– If accident occur, those able to give assistance should know how
to rescue a victim safely and apply emergency treatment. E.g. CPR
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Occupational Health & Safety Occupational Health & Safety Act (OSHA)Act (OSHA)
• Began develop standards in 1970• Purpose : to protect employees from
hazards in the workplace• Covering : construction sites, installation,
maintenance, & electrical repairing• Subpart S, Part 1910 of Title 29 of the
Code of Federal regulations : electrical safety
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OSHAOSHA• Subpart S, Part 1910 of Title 29 of the Code of
Federal regulations : electrical safety– 1910.302 - Electrical Utilization Systems– 1910.303 - General Requirements– 1910.304 - Wiring Design & Protection– 1910.305 - Wiring Methods, Components, &
Equipment for General Use– 1910.306 - Specific Purpose Equipment &
Installations– 1910.307 - Hazardous Locations– 1910.304 - Special Systems
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OSHAOSHA
• OSHA requirements:– All electric products, conductors and
equipments to be approved or to be replaced with products MUST satisfy the OSHA definition of acceptability
– All products MUST be installed in accordance with the manufacturer’s instructions (if any)
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HazardHazard
• Electrical Shock• Fire• Electric static • Brightness
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ELECTRICAL SHOCKELECTRICAL SHOCK
• Electric shocks caused by electrical equipment without warning and often serious
• 3 ways the electric shock be FATAL!!– Respiratory arrest– Asphyxia– Ventricular fibrillation
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ELECTRICAL SHOCKELECTRICAL SHOCK• Respiratory arrest: uncommon that requires
current to pass through the head in the region of the respiratory centre at the back of the skull
• Asphyxia: by increasing shock currents, tingling sensations are replaced by tightening of the muscles– 10 mA: forearm muscles contract sufficiently so victim
holds on to any life conductor that he/she has been gripping and might not be able to release it.
– 30 mA: consciousness will be lost after a minute or so, followed by death a few minutes later
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ELECTRICAL SHOCKELECTRICAL SHOCK
• Ventricular fibrillation: the heart muscle do not contract in a synchronized rhythm enabling blood to be pumped around body. So, stopping blood from circulating, then he/she will die!
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Do you want these happened?Do you want these happened?
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Do you want these happened?Do you want these happened?
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Do you want these happened?Do you want these happened?
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55’’SS
5 S1.SEIRI
2.SEITON
3.SEISO
5.SHITSUKE 4.SEIKETSU
Separate
Arrange
Clean
StandardDiscipline
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Why 5Why 5’’S is so important?S is so important?
• Easy to find the required things – save time!
• Easy to do audit on the goods
• Avoid accident [neatly arrangement]
• Safety first!• Be a discipline and
systematic person
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How power supply reach us?How power supply reach us?
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POWER GENERATION, POWER GENERATION, TRANSMISSION & DISTRIBUTIONTRANSMISSION & DISTRIBUTION
GenerationTransmission
Distribution
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POWER POWER GENERATION, GENERATION,
TRANSMISSION & TRANSMISSION & DISTRIBUTIONDISTRIBUTION
11 kV
11/66, 132, 275 kV
132/11 kV
11 kV/415 V 240V
Distribution System
Transmission System
Power plant
Transmission substation
Power substation
Transformer
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Distribution Sub StationDistribution Sub Station
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User SupplyUser Supply
PENCAWANG PEMBAHAGIAN 11/.433KV
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Feeder PillarFeeder Pillar
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Domestic wiringDomestic wiring
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Main circuitMain circuit
• Shall complied IEE Regulation
– Isolation & over current protection
– Over current protection
– Residual Current or Earth Leakage current protection
Incomingsupply
Services fuse
NeutralLink
Kilowatt-hour
meter
Main switch & Fuse
RCCB
Distribution Board
kWh
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Main circuitMain circuitSymbol Name Function
Services Fuse & Neutral Link
To Limit maximum current rating
Kilowatt-Hour meter
To record usage of total energy
Main Switch &fuse
1. To switch off customer circuit when needed
2. To disconnect circuit when short circuit and over current occurred
kWh
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Main circuitMain circuitSymbol Name Function
RCCB To cut off circuit when have leakages current to earth.
Distribution Box To locate a Miniature Circuit Breaker (MCB) and Fuse.
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Main wiring circuitMain wiring circuit
kWh NE
incoming
Services fuse
NeutralLink
Kilowatt-hour
meterMain
switch & Fuse RCCB
Distribution Board
Fuse / MCB
Electrical circuit
EarthingElectrode
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Final CircuitFinal Circuit
6A
16A
16A
RCCBMain Switch
30A SPN 40A 100 mA
Schematic Diagram
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Final CircuitFinal Circuit
Wiring Diagram
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Services FuseServices Fuse
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Neutral LinkNeutral Link
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kW HourskW Hours
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Distribution BoxDistribution Box
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RCCBRCCB
• Residual Current Circuit Breaker
• an electrical wiring device that disconnects a circuit whenever it detects that the electric current is not balanced between the phase ("hot") conductor and the neutral conductor
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RCCBRCCB
• Main characteristic– Number of poles [2P
or 3P or 4P] – Rated current [in A] – Sensitivity [in mA] – Type [AC or A or B] – Break time [in ms] – Surge current
resistance [in A]
• Rated current [in A]– According to the
maximum sustained load current it will carry
• Sensitivity [in mA]– Is expressed as the
rated residual operating current, noted IΔn
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RCCBRCCB
• Type [AC or A or B]– Standard IEC 60755
(General requirements for residual current operated protective devices)
• Type AC: • Type A: • Type B:
• Break time [in ms]– There are two groups
of devices:• G (general use) for
instantaneous RCDs(i.e. without a time delay)
• S (selective) or T (time delayed) for RCDs with a short time delay(typically used in circuits containing surge suppressors).
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MCBMCB
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MCB InternalMCB Internal
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Table 4ATable 4A
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Table 4ATable 4A
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Table 4ATable 4A
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Lamp circuitLamp circuit
• IEE regulation– 1 protection circuit
must control not more than 1000 watt.
– Minimum cable size is 1.25 mm2
– MCB or fuse rating shall not more than 6A
NLE
C
L1
Batten Lamp holder type
1-way switch
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Lamp CircuitLamp Circuit
NL
C
E
L1 L2
2-ways switch
C
L1 L2
C
L1 L2
in To lamp
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Lamp CircuitLamp Circuit
• Circuit for fluorescent lamp.– Correction
factor for load current calculation, 1.8
NL
E
CL1
L2
CL1
L2
LNBallast
Capacitor
Starter
Lamp Tube
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Ceiling fanCeiling fan
switch
Fan Controller
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Electrical Door BellElectrical Door Bell
12VTransformer
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Socket Outlet Socket Outlet
• Normally socket outlet BS 1363
• Two type circuit connection– Radial circuit– Ring circuit
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Radial CircuitRadial Circuit