Extension cord with microwave


Old 05-30-18, 02:40 PM
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Extension cord with microwave

I have a microwave with the following ratings:
1200 Watts power consumption
800 Watts Output power

It it safe to hook it up with an appliance extension cord (like this one https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1 )
And is 6 feet about the maximum length I should run?

Same question with a lower wattage microwave. I was thinking about getting this one which is only 600 W. https://www.homedepot.com/p/Westingh...FcwXYgodblsPng
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Old 05-30-18, 05:07 PM
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Probably safe but extension cords are considered for temporary use only. Recommended procedure is to add a receptacle near the microwave oven.
Old 05-30-18, 05:18 PM
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At what point (in wattage drawn) are extension cords not recommended?
For example I have a 900 watt Mr. Coffee machine. The manual says nothing about avoiding extension cords.
Old 05-30-18, 06:46 PM
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The NEC states that extension cords are for temporary use and are not to be used as a replacement of permanent wiring, regardless of size.
Old 05-30-18, 08:21 PM
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I do not have the numbers at my fingertips or on the top of my head but you can calculate the voltage drop given the number of amperes (10 amps based on watts consumption for the larger microwave oven) and the wire resistance given the size of the wires in the extension cord and their length (use round trip). Voltage drop should be less than 3 percent. The voltage dropped in a length of wire or in any portion of a circuit equals the amperes flowing at that moment times the resistance of the wire or the portion of the circuit. The fatter the wires in the extension cord the longer extension cord you can use with a particular appliance.

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