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Thread: 1 HP 120V EF's

  1. #1
    Join Date
    Mar 2006
    Location
    Boston, MA
    Posts
    949

    1 HP 120V EF's

    Need to feed a 1HP motor with 120V. The motor has a FLA @120V of 16A. So I could use #12AWG for the wiring (125%) but will need 25A or maybe 30A breaker.

    I want to control them with a switch. Does the switch need to have a rating equal to the circuit breaker or can it be based on the FLA of the motor. i.e. can it be a 20A switch?

    Thanks,

    Mike
    Mike Shields, PE
    Boston, MA

  2. #2
    Join Date
    Sep 2010
    Location
    Riverside, CA.
    Posts
    28
    Hope this helps.

    Per the 2014 Code

    430.83 Ratings.

    (C) Stationary Motors of 2 Horsepower or Less. For
    stationary motors rated at 2 hp or less and 300 volts or less,
    the controller shall be permitted to be either of the following:

    (1) A general-use switch having an ampere rating not less
    than twice the full-load current rating of the motor

    (2) On ac circuits, a general-use snap switch suitable only
    for use on ac (not general-use ac–dc snap switches)
    where the motor full-load current rating is not more
    than 80 percent of the ampere rating of the switch

  3. #3
    Join Date
    Mar 2006
    Location
    Boston, MA
    Posts
    949

    it certainly does help

    awesome - thanks
    Mike Shields, PE
    Boston, MA

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