Motor Circuit Breaker Sizing. For example the full load current of a 5 hp motor at 460v is 7 6 amps. Motor hp voltage typical motor f l a.
Select the percentage from table 430 52 according to the type of protection device such as non time delay. Maximum loading of any circuit breaker is 80 of rating for non motor loads with exceptions as noted below. Circuit breaker size 2.
Motor wire size and circuit protection calculator.
3 thhn cable relates to 90c group hh means 90c why did you use 60c column to determine wire size. The table will give you the size of the short circuit protection as a percentage of the full load current. Breaker cannot be larger than ampacity of wire except for motors and a few other loads. Motor hp voltage typical motor f l a.
