Section 6(2) in The Merchant shipping (Radio Direction Finders) Rules, 1968.
(2)All parts and wirings of an equipment specified in these rules (other than the parts and wiring of a rotating machine) in which the direct and alternating voltages (other than radio frequency voltages) combine at any time to give an instantaneous voltage greater than two hundred and fifty volts shall be isolated automatically from all sources of e1ectrical energy when the means of protection are removed .
