Seeking some perspective on motor currents.
For electric motors for equipment such as drill presses or air compressors or such, would the starting current and the locked rotor current be of similar order of magnitude ?
Next, would you agree that the nameplate FLA more less means same as 'running current' ?
Next, for a regular, garden variety 20 amp circuit breaker, approximately how quickly is it designed to trip upon experiencing overcurrent ?
Next, I have a book that sez, quote,
"The next size up rule does not apply when fuses are used for overload protection".
Where if anywhere in Article 430 or anywhere in the Code is that rule stated ?
Next, outside of 15 and 20 amp lighting and receptacle circuits, multioutlet branch circuits supplying receptacles for cord and plug connected portable loads, situations where ampacity of conductors corresponds with the standard ampere rating, and outside of circuits over 800 amps, for what any scenario(s) would you say the next size up rule for OCPD devices is not applicable ? (in other words, what is any scenario(s) that would be an example(s) of when the next size up rule is not allowed to be followed ? ).
Thanks.
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