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In the 24th edition of the Ontario Electrical Safety Code, the requirement for the circuit breaker (and its associated control circuits) battery not to supply any other loads has been deleted. Still good design to have separate supply though.

Rcwilson, thank-you so much. And to the other posters who have made it quite clear that it is better to have a separate battery (linked to cranking batteries via diode and a common battery charger) to power the protective relays and shunt trip signal to the generator circuit breaker.

Your advice is appreciated. I would have more leverage with the generator supplier if I could refer to an industry standard.

I am working on grid connecting a synchronous generator. The control signal to trip the generator circuit breaker is 24VDC. 24VDC is also used to power the generator protective relay and intertie protective relay. This 24VDC (a battery bank) is also used for cranking the prime mover. Is there...