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SESK: Stuff Everyone Should Know · sesk.info/elec-motor-disc-115

A motor disconnect must have an ampere rating of at least what percent of the motor's full load current?

At least 115% of the FLC rating.

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  1. 115% ✔
  2. 100%
  3. 125%

Why: Section 430.110(A) sets the minimum disconnect rating at 115 percent of the motor's full load current. That gives a small margin for the disconnect to carry current continuously.

Huh, didn't know that: Every motor and controller must include a disconnect.

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References

Answer: 115%. Section 430.110(A) sets the minimum disconnect rating at 115 percent of the motor's full load current. That gives a small margin for the disconnect to carry current continuously.

  1. EC&M: NEC Motors Part 9 www.ecmweb.com/maintenance-repair-operations/motors/article/21250101/nec-motors-part-9
    115% of the motor’s full-load current rating.
    Checked 2026-10-10.

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