DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (http://www.diychatroom.com/)
-   Electrical (http://www.diychatroom.com/f18/)
-   -   What size breaker for 4100 watt wall oven? (http://www.diychatroom.com/f18/what-size-breaker-4100-watt-wall-oven-53030/)

romexican 09-15-2009 01:32 AM

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?

oilseal 09-15-2009 06:08 AM

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

J. V. 09-15-2009 11:40 AM

Quote:

Originally Posted by romexican (Post 327902)
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.

kbsparky 09-15-2009 09:34 PM

Quote:

Originally Posted by J. V. (Post 328061)
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. :huh:


All times are GMT -5. The time now is 09:53 PM.


Copyright 2003-2014 Escalate Media LP. All Rights Reserved