Wall oven

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nizak

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I have a wall oven I need to install that has a 7.8 KW rating.

Cut sheet for the appliance states 50amp breaker and #8 Cu wire. NM #8 = 40 amp

Manufacturer specs listed on a different site just state 40 amp breaker @240V.

If I use the KW rating at 240V I come up with 32.5 A . Am I correct in saying a 40 amp breaker with 8/3 NM cable would be code compliant?

Not a huge deal but I’m running almost 100’ from the panel . The cost difference between 6/3 and 8/3 is enough to look into both options.

Thanks
 
infinity said:
Disregarding any manufacturer's notes could this put on a 30 amp circuit?
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I would think not given the 7.8kW rating of the oven, it would indicate min OC of 35A as at 32.5A actual is over the 30A.
augie47 said:
#8 is fine
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So long as OCD is limited to 40A with use of the 8/3 NM cable. Bump up to MC and NP with 50A if really wanted, but no need for anything larger than 40A if 35A breaker not available for 7.8kW.

Personally I would wire for 50A so that if product changes before installation or later it will work for most residential ovens out there.
 
You're correct. I confused wall oven and range. A range can use the table and note 4 when sizing the branch circuit.
 
Fred B said:
So long as OCD is limited to 40A with use of the 8/3 NM cable. Bump up to MC and NP with 50A if really wanted, but no need for anything larger than 40A if 35A breaker not available for 7.8kW.

Personally I would wire for 50A so that if product changes before installation or later it will work for most residential ovens out there.
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I'm with @Fred B ; check the price of #8MC. It might only be a few percent more expensive than 8 NM, and that gets you into the 75C column and 50A in an 8/3 cable.

Jon
 
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