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Old 09-15-2009, 02:32 AM   #1
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What size breaker for 4100 watt wall oven?


I just installed a new wall oven which the nameplate states it draws 4.1kW. I believe the cable supplying the jbox to the oven is 8/3 AL (based on the size of the conductors and the 30 amp breaker its connected to). Is a 30 amp breaker ok to use for this oven? The manual states that for 4800 watts and less they recommend using a 20 amp breaker.

http://manuals.frigidaire.com/prodin.../318201532.pdf The breaker recommendations are on page 3.

Are you not supposed to load a dedicated (or otherwise) circuit to more than 80%?

4100/240=17.083...

So the oven only draws a fraction over 17 amps, but 80% of a 20 amp circuit would only be 16 amps. So is the next breaker size of up 30 amps the right one to use?

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Old 09-15-2009, 07:08 AM   #2
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What size breaker for 4100 watt wall oven?


romexican: Leave well enough alone. Your 30a cable and CB are just what you need.

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Old 09-15-2009, 12:40 PM   #3
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What size breaker for 4100 watt wall oven?


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Originally Posted by romexican View Post
I just installed a new wall oven which the nameplate states it draws 4.1kW. I believe the cable supplying the jbox to the oven is 8/3 AL (based on the size of the conductors and the 30 amp breaker its connected to). Is a 30 amp breaker ok to use for this oven? The manual states that for 4800 watts and less they recommend using a 20 amp breaker.

http://manuals.frigidaire.com/prodin.../318201532.pdf The breaker recommendations are on page 3.

Are you not supposed to load a dedicated (or otherwise) circuit to more than 80%?

4100/240=17.083...

So the oven only draws a fraction over 17 amps, but 80% of a 20 amp circuit would only be 16 amps. So is the next breaker size of up 30 amps the right one to use?
You should know the 80% rule for residential is bunk. It's a myth. I am not certain about commercial.
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Old 09-15-2009, 10:34 PM   #4
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What size breaker for 4100 watt wall oven?


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Originally Posted by J. V. View Post
You should know the 80% rule for residential is bunk. It's a myth. I am not certain about commercial.
The so-called 80% rule applies to continuous loads and wall ovens are not included in that category.

Things like electric water heaters are so classified, and the 80% "rule" applies to circuits that supply such units.
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