Code Q&A: Finding Highest Rated Motor in Group

Code Q&A: Finding Highest Rated Motor in Group

NEC requirements for determining the highest rated motor

Q. When sizing conductors for more than one motor, what does the Code consider to be the highest rated motor?

Find the Answer

A. When sizing motor circuit conductors, the highest rated motor is the motor with the highest rated full-load current (FLC) rating [430.17].

For example, let’s say you have this group of three motors:

10-hp, 3-phase, 208V

3-hp, single-phase

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