House wiring is required
for new construction and also for repairing / modification / up gradation in
future. The completion of job should not be treated as horse play. In case of
defects in electrical wires it can cause fire in house and may even take human
life in some cases.
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| Wiring test certificate |
How to ensure good electric works?
- A professional or experienced electrician
should be hired for electrification job. All electric works and
installations should comply with latest Indian Electricity Acts and Rules
in all respects.
- Make sure that electrician has calculated
total load from various items that would be used in the house. Whether he
lays wires that are capable of taking total load.
- All materials used in electrical fittings
should be of approved and from a reputed manufacturer as per ISI
specifications.
- It is the observation that electricians are
careless while putting right load bearing wires for a purpose and these
wires get burnt at the movement when entire load is put on wires.
House Wiring tips as per ISI Specification
- The wiring should be carried out for power
distribution systems with main and branch distribution boards to
convenient centres distinguishing power circuit and lighting circuit
separately.
- All conductors should run, as far as possible
along walls and ceilings, so as to be easily accessible and capable of
being thoroughly inspected.
- We should avoid wiring on above ceiling.
- Medium pressure wiring and all associated
apparatus should comply with specification.
- The numbers of points in light circuits should
not exceed 10 or the total load on circuit should not exceed 800 watts.
- One circuit can be explained as one connection
from electrical meter or main fuse circuit.
- For power wiring circuit the numbers of points
in a circuit should not be more than 2 and the size of wire is 1.5 mm
square copper only.
- Switch boards should be fitted at a height of approximately
1.2 meter.
- Horizontal run of wiring should be at a height
of 3 meter.
- Earth wire should be 14 SWG in case of copper
and 4 mm square in case of aluminium.
- Fuse wire should be connected to phase wire
only.
- Connect a neutral link in neutral wire.
- Connect all switches in phase wire.
- Use 4 sqmm copper wire for power point as for
AC and heater.
- Power wiring is not les than 2.5 sqmm copper
wire.
- Follow colour code even in single phase, Power-R/Y/B
colour, neutral-black, earthing-green.
- Inverter or emergency wire colour may be white
/gray for clear identification.
- An ELCB is essential of 30mA rating for safety
reason.
- Don’t forget to test ELCB to test monthly for
working.
- Minimum size of earth wire for light circuit
is 1 mm square for copper and 1.5 mm square for aluminium.
- One should avoid using aluminium wire for
house wiring or where it is less than 6 sqmm due to breaking easily.
- Contractor or electrician should be asked to
make test certificate.
What is the Electrical Installation Certificate?
BS 7671 (IEE Wiring Regulations): It is the safety
Certificate which confirms that the electrical installation work to which it
relates has been designed, constructed and tested. It is a legal requirement.
IS 732
(1989): Code of Practice for Electrical Wiring
The
Electrical Installation Certificate is required for:
- New installations
- When a new circuit or circuits are installed to an existing installation
- The changing of a consumer unit (distribution board)
- When a circuit is altered and the alteration requires changing of the protective device.
- New installations
- When a new circuit or circuits are installed to an existing installation
- The changing of a consumer unit (distribution board)
- When a circuit is altered and the alteration requires changing of the protective device.
After the initial
verification, once the full inspection and testing procedure has been carried
out, an Electrical Installation Certificate is completed.
To be valid
the Electrical Installation Certificate must be accompanied by a:
- the Schedule of Inspections
- the Schedule of Test Results.
- the Schedule of Inspections
- the Schedule of Test Results.
The original document
must be given to the "person ordering the work" and a copy should be
kept by the electrician who completed the inspection and testing.
TYPICAL TEST CERTIFICATE
Dated: xx.xx.xxxx
Form of Completion Certificate
I/We certify that the installation detailed below has been completed
by me/us and tested and that to the best
of my/our knowledge belief it complies with Indian Electricity Rules, 1956,
Electrical installation at (location)---------
----------------------- _________________________,
----- Voltage and system of supply.
1. Particulars of work:
a) Internal
Electrical Installation
No. Total
Load Type or
system of wiring
i) Light point ii) Socket point
a) 5pin 5
Amp.
b) 6 pin 15 Amp.
b) Others
2. Earthing:
-
i) Description of earthing electrode
ii) Number of earth electrode
iii) Size of main earth lead
3. Test
results :
a) Insulation resistance
i)
Insulation resistance of the whole ystem of conductors to earth
ii)
Insulation between the phase conductor and neutral Megaohms
Between
Phase R and neutral
Megaohms
Between
Phase Y and neutral Megaohms
Between
Phase B and neutral Megaohms
iii)
Insulation resistance between the phase conductors in case of polyphase supply.
Between
Phase R and Phase Y Megaohms
Between
Phase Y and Phase B
Megaohms
Between
Phase B and Phase R Megaohms
b) Earth
continuity test- Maximum resistance between any point of the earth continuity
conductor including metal conduits and main earthing leads Ohm c) Earth
Electrode Resistance Resistance of each earth electrode i)……………..Ohm
ii)…………….Ohm iii)……………Ohm iv)……………Ohm
Signature
Signature
Name of client rep. Name of the Supervisor
M/s----- M/s-----(seal
of company.)
