NEC cookoing equipment

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sandsnow

sandsnow

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Southern California
I understand that in the NEC, cooking equipment is considered ranges, wall mounted ovens, and cooktops.
A counter mounted cooking unit is defined to be what we would commonly call a cooktop. A permanently installed microwave does not appear to meet this definition.
This is asked in applying the the demand factor permitted by 220-32(a)

Can permanently installed microwaves be considered as meeting the requirements of 220-32(a)(2)?
I've always considered a microwave as an appliance and if fastened in place it would fall under 220-17 for a individual dwelling calculation.

Thanks
 
Re: NEC cookoing equipment

Originally posted by sandsnow: Can permanently installed microwaves be considered as meeting the requirements of 220-32(a)(2)? I've always considered a microwave as an appliance and if fastened in place it would fall under 220-17 for a individual dwelling calculation.
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To your question, my answer would be ?No.? To your expression of an opinion, my reaction is that I agree.

But it is an interesting issue. 220.19 includes ?other household cooking appliances individually rated in excess of 1.75 kW.? It?s been a long time since I?ve bought a microwave. Do they have that kind of power (i.e., equivalent to 114.6 amps)?
 
Re: NEC cookoing equipment

But it is an interesting issue. 220.19 includes ?other household cooking appliances individually rated in excess of 1.75 kW.? It?s been a long time since I?ve bought a microwave. Do they have that kind of power (i.e., equivalent to 114.6 amps)?
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I think you have an extra 100 Amps in there. 1750 Watts/120 Volts = 14.6 Amps :confused:

The largest microwaves I've seen are in the 1.5 kW range, usually closer to 1.0 kW.
 
Re: NEC cookoing equipment

in excess of 1.75kw
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It is interesting that the 1.75 kw number comes so close to 15A. It seems like they may have been trying to exclude appliances on a 15A branch circuit.

Wait... the table says 1.75 kw, but the text says 1 1/3 kw, or am I missing some difference between the numbers? (2002 NEC). A microwave could probably exceede that number.

My gut feeling is that if you are sizing a service or feeder, you are sizing it too small if a fraction of the microwave power makes a difference.

Steve
 
Re: NEC cookoing equipment

Thanks, Ken. I think i'll blame the typo on the Monday morning blues.
 
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