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Question

At a pressure of 500 V applied between each live conductor and earth for a period of one minute, the insulation resistance of medium and low voltage installations shall be at least : 

A.

1 kilo ohm 

B.

1 mega ohm 

C.

100 mega ohm

D.

0.5 kilo ohm

Answer ( Option B)

1 mega ohm 

Solution

At pressure of 500V applied between each live conductor and earth for a period of one minute, the insulation resistance of medium and low voltage installation shall be at least 1 mega ohm.

Hence, the correct option is (B).

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