I’m putting together a 15hp rotary phase converter. What protection do I need?
I bought a capacitor panel and 15hp 3 phase motor rated 38amps/230v to build a rotary phase converter to power my 7.5hp pressure washer. The washer motor is rated for 21amps and with diesel heater the whole unit is rated for 25amps. The panel manufacturer says that in the panel, there is a relay which automatically starts the 15hp motor. I assume this “relay” also disengages the start capacitors when the motor is started. Reading the NEC code book, it looks like I need more “protection” -thermal, overcurrent, etc… The manufacturer of the panel says a 50amp circuit breaker is enough.
I’d like this phase converter to be up to NEC specs. What else should I add to this system to make my local electrical inspector happy, and allow me to sleep at night. I’m installing a smoke detector in the garage which will be connected to my home’s fire alarm system.
NEC code citations, make/model info, and general specs on needed devices are greatly appreciated.
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