Specifications

163
NLUO PMC CONTRACTOR
SIGNATURE AND SEAL SIGNATURE AND SEAL SIGNATURE AND SEAL
17. TESTING OF INSTALLATION :
Before a completed installation or an addition to an existing installation is put into service, the following tests shall be carried
out by the contractor in presence of the Engineer-in-charge.
(a) Polarity of switches :
It must be ensured by test that all single pole switches have been fitted on the live side of the circuits they control.
(b) Insulation test :
(i) By applying a 500 volt megger between earth and the whole system of conductors or any section thereof, with all fuses in
place and all switches closed, all lamps in position or both poles of installation otherwise electrically connected together. The
result in meghom shall not be less than 50 divided by the number of points on the circuit, and should not be less than 1
meghom.
(ii) Between all conductors connected to one phase and all conductors connected to the neutral or to the other phase conductors of
the supply after removing all metallic connections between the two poles of the installation and switches on all switches. The
insulation resistance shall be as in (I) above.
(c) Earth Continuity Test :
The earth continuity conductor including metal conduits, and metal sheaths of cables in all cases shall be tested for electrical
continuity. Electrical resistance of the above along with the earthing leas cut excluding any resistance of earth leakage circuit
breaker, measured from the connection with the earth electrode to any point in the earth continuity conductor in the completed
installation shall not exceed one ohm.
(d) Earth Resistance Test :
To ensure effectiveness of installation earth, the value of earth resistance shall within 5 0hm for installation capacity upto 5 KW
and one ohm for installation of higher capacity.
18. The completed work will be taken over only if the result obtained in above tests are within the limits mentioned above and in
accordance with I.E. Rules.