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Circuit Load

sshazam1

Sep 2, 2013
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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
 

Harald Kapp

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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.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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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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