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NEC 430 Motor Overload Practice Questions (California Exam)

Article 430 has two different jobs that use two different currents. Overload protection is one of them, and it is where the nameplate matters. Here is the rule, the trap, and an original question worked through.

Last reviewed June 2026

What the exam is really testing

  • Overload sizing off the nameplate full-load amps (FLA), per 430.32.
  • The 125% versus 115% split based on service factor or temperature rise.
  • Knowing overload (nameplate) is separate from conductor sizing (table FLC).
  • The next-step-up allowance in 430.32(C) when the standard setting will not start the motor.

The trap

Candidates use the table full-load current for overload. Overload uses the nameplate amps. The table current is for the conductor and short-circuit protection, not the overload device.

Try an original question

Sample question · original

A motor nameplate shows 28 amps full-load current and a service factor of 1.15.

Per NEC 430.32(A)(1), what is the standard maximum overload protection setting?

  • A28 amps
  • B32.2 amps
  • 35 amps
  • D36.4 amps

Answer C. 430.32(A)(1) sets overload protection at 125% of the nameplate full-load amps for a motor with a service factor of 1.15 or greater. 28 amps times 1.25 equals 35 amps.

  • NEC 2023 430.32(A)(1)
  • NEC 2023 430.32(C)

Why the other answers tempt you

  • A: 28 amps is the nameplate with no margin. The rule adds a percentage.
  • B: 32.2 amps is 115%, used for motors with a service factor below 1.15 or a temperature rise over 40C.
  • D: 36.4 amps is 130%, the next-step-up allowed by 430.32(C) only when 125% will not start the motor, not the standard.

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