Hey chris heres how to rate a breaker .



standard scale for rating a breaker / fuse

a 15 amp circut breaker or fuse would be only rated at 12 amps by the NEC ( national electric code ) they way that this is figured out is the amperage of thebreaker / fuse is multiplied by 80% the resulting figure is the maximun rated amperage that the breake / fuse can carry.I use to have my NC electrical liscense but it has sincelapsed and personally i havent been upto date in 5 yrs or so on code changes which change like underwear lol .



Now as to the 12 mp rating that is driven my things like maximum surge startup etc things like motors , compressors etc may be rated at say 20 amps butthe running amperage may only be 10 amps what this means isthat when that motor / compressor first starts up fora fraction of or a few seconds its getting its biggest amperage pull then drops to the running amps.Under noraml situations its rare that you would have several maximum loadstart ups all hit at the same time if so this would likely causethe breaker to trip or fuse to blow.I will look back on some things and post how to get your amps on things like wattages there is also a formula to add up watts and multiply by a number but right now i just draw a blank.This would allow you to add up wattages of your heating devices etc and come up with your max ampoerage ratings.

hope this helped you a little and didnt muddy the water lol take care

Alan
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