The work is in Canada, and should follow the Ontario Electric Safety Code. For this application, I would like to use a #10 AWG wire for an MOV. My available fault current is roughly 50 kA at the MCC bus feeding the MOV through a MCCB. The available fault current appears to be too high for the...
I should add that I have been investigating using current limiters with my MCC breakers. This seems like it will be costly. I don't know that it is necessary. I would like to find guidance that allows me to forego using the current limiters with a smaller wire size.
Is it common practice to use current limiters with circuit breakers to limit short circuit current in power circuits for smaller loads fed from Motor Control Centers (MCCs)? I am finding that when sizing cables for available short-circuit currents per ICEA P-32-382-2007 that I have to upsize...
I am specifying a 125 VDC VRLA battery that will be connected to a distribution bus that provides standby power for a UPS as well as 3 125 VDC loads. The battery operating voltage range is 105 - 140 VDC. The VRLA battery will supply standby power for 2 hrs. for a constant load of approximately...
