I looked at a job recently where, the main Fused disconnect needs replacing. There is 10 meters after the disconnect. The utility fault current is 22K, I believe this is why there was fuses, and not a main circuit breaker, current limiting fuses. The EC that is going to do the job wants to put in a main breaker with a 22K rating, all the equipment down stream of the main is old and has a fault current rating of 10K or less. The downstream equipment is fed off a gutter 19ft long.
I say this is not allowed with out an EE signing off on it. Any argument for or against this stand?
I say this is not allowed with out an EE signing off on it. Any argument for or against this stand?