Rule 65
Danger Of Leakage At High Voltage
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(1) The insulation resistance of 3,300  volt electric system shall be at least 20 megaohm.
(2) While calculating the insulation resistance of more than 3,300  volt electric system, it shall be done by adding 1 megaohm for each 1,000  volt on 20 megaohm.
(3) The operation of electric system without the insulation  resistance as mentioned in sub-rule (1) and (2) shall not be allowed.