Breaker sizing for 480V single phase loads
Breaker sizing for 480V single phase loads
(OP)
How do I calculate the loads on each leg of a 480V three phase system that has 17, 1000W, 480V single phase lights on it.
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Breaker sizing for 480V single phase loads
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RE: Breaker sizing for 480V single phase loads
I was going to ask if these were 480V or 277V, but it really doesn't matter, as long as they are balanced between the phases.
RE: Breaker sizing for 480V single phase loads
I note your voltage is not UK standard and thus other than UK regulations apply. Anyway, I hope info is of some use.
Regards,
Lyledunn
RE: Breaker sizing for 480V single phase loads
Wire size is #10 with #10 Gnd.
RE: Breaker sizing for 480V single phase loads
Molded-case breakers with 480Y/277-volt ratings, or 300-volt fuses must only be served by a wye solidly-grounded transformer secondary.
RE: Breaker sizing for 480V single phase loads
good point. Here in the UK many forget to derate for loads of long duration, say over 1 hr. Further derating may be required if the breaker is installed in the horizontal position at the top of a stack of loaded breakers. I have noted in the past the seemingly unexplained operation of a non-loaded breaker being entirely due to the thermal stacking of loaded breakers below it.
Regards,
Lyledunn