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Circuit Load

Discussion in 'General Electronics Discussion' started by sshazam1, Sep 2, 2013.

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  1. sshazam1

    sshazam1

    1
    0
    Sep 2, 2013
    Can a 1200 W microwave be on the same 20 Amp circuit as a 3/4 HP garbage disposer and both be operating at the same time? What is the electrical code on putting these two items on one 20 Amp circuit?
    Sshazam1
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    I don't know the electrical code in your country, but as long as the sum of the currents for microwave+motr is less than the fuse rating, everything should be o.k. Youll find the rated current on the motor's type label.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    It depends on the voltage.

    1HP is 745W, so 3/4HP is about 560W

    At 120V, 1200W is 10A, 560W is under 5A, so the sum is well under 20A.

    The problem may arise if the motor has a very large startup current and the circuit cannot handle the (potential) short term overload.

    Most circuit breakers are made in such a way that they do not open immediately thee load exceeds the rated value, however they will open faster if the overload is greater.
     
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