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Old 10-12-2012, 06:37 AM   #1
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range question- common question but eager to learn info!


i have an electric range/double oven and the instructions state that it needs a MINIMUM of 40amp 240v dedicated circuit. the label on the front states that at 120/240v its rated for 13.8 Kw. isn't there a NEC code that states ranges over 12 Kw need a 50 amp circuit?

out of curiosity because i don't know a whole lot about commercial power, the label also says at 208Y/120v the power rating is like 6 or so Kw; is that 3 phase power?

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Old 10-12-2012, 07:04 AM   #2
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range question- common question but eager to learn info!


Table 220.55, Note 1, would apply

Table 220.55 Column C is for ranges from 8 3/4 to 12 kw.
For 1, 12kw rated range a demand of 8 kw is allowed.

Note 1. For ranges over 12 kw 5% shall be added for every kw and major fraction. (in a nut shell)

So with a 13.8 kw range it would be 8kw + 10% = 8.8kw
8800/240= 36.6, next higher would be 40a

If my math is incorrect I'll be corrected by someone

Yes 208/120 is for 3 phase.

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Old 10-12-2012, 10:31 AM   #3
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that is crystal clear! thanks, i have the 2011 nec pocket edition at home and i will double check. i have read heated arguments in the past on here about whether its better to just run a 6/3 w/50amp rather than a 8/3 with 40 amp to "future proof" the kitchen.

its a starter home so i will most likely do the 8/3 with 40amp breaker.
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Old 10-12-2012, 06:57 PM   #4
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range question- common question but eager to learn info!


It really doesn't matter what the NEC states, you have to go by the manufacturer's instructions. They, in a sense, trump the code.
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Old 10-12-2012, 08:03 PM   #5
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range question- common question but eager to learn info!


yes i have heard that, the instructions explicitly state a MIN of 40 amp circuit; that leaves interpenetration that 50 amp is suitable as well.

now quoting office space, is the BARE minimum in this case worse or is perfectly adequate and recommended?
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Old 10-12-2012, 08:14 PM   #6
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Perfectly adequate

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