what is the difference in using the 125% and the 250% factor of safety in calc

what is the difference in using the 125% and the 250%
factor of safety in calculating circuit breakers capacity
for motors,which is more reliable to use the 125% or 250%??

Question Posted / jaycee

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what is the difference in using the 125% and the 250% factor of safety in calculating circuit brea..

Answer / wareagle

You are not required to use 125% for motors. The NEC says
that the breaker rating can be up to 250% of the motor FLA.

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