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Kitchen Range Does Not Match Load Calc

That load calculation has over half a dozen different errors, so I imagine that one would start with correcting those.

Even so, the final answer is very likely to come out to below the 125A specified at the top, so as long as that accurately specifies the capacity installed, this will only require paperwork fixes, not any actual rework.

Cheers, Wayne
 
ICE said:
Math is not their strong suit. We usually required a load calc before issuing a permit.
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Absolutely, and this is the problem that inspectors run across every single day. Stuff like this makes it through plan review and ends up on the job site. Oh... I think I have another idea for an article.
 
The Water Heater is rated 7.2 KVA (2/50A breaker)? It should be 4500 watts upper and lower element >>>>>2/25amp breaker?
 
jar546 said:
Did you look at the specs for the range?
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Yes I did. I didn't look at the specs for the oven. The cook-top is 10.4kw. The unknown oven at 125% will add a load.
 
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ICE said:
Yes I did. I didn't look at the specs for the oven. The cook-top is 10.4kw. The unknown oven at 125% will add a load.
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The overall range is rated at 40A on the spec sheet, so 9.6 kVA (for a 240V supply) suffices.

And what do you mean by "at 125%" in the above?

Cheers, Wayne
 
ICE said:
The oven has a Sabbath Mode.
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That doesn't make it a continuous load. Even if it's set at 500F for 48 hours, the element will be cycling on and off thermostatically, so often the load will be near zero. I expect even in a 4 hour self-clean mode, the element won't be on at full load for over 3 hours, although I'd be curious to see the current vs time profile for that.

The only kind of oven-type appliance you might run into in a residential setting which has a good chance of being a continuous load is a small electric kiln for pottery. There the temperature deltas might be large enough compared to the element wattage and thermal mass that during the initial temperature ramp up, the element will draw full power for over 3 hours.

Cheers, Wayne
 
wwhitney said:
self-clean mode
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I know guy that put a steak in the oven and turned on the self clean mode. He figured that his steak would cook in a few minutes. He was right about that. He learned that the door locked when in self clean mode. The neighbor called the fire dept.
 
jar546 said:
Then there are the holidays when both ovens and all stovetop burner are on at the same time for most of the day when you have friends and family over.
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That will likely give you the largest load their respective branch circuits will see all year, but it still won't be a continuous load, as the burners are thermostatically controlled as well. Also, most induction cooktops have a ***** mode where they can power a burner at an elevated level for a limited amount of time. That alone ensures that the burner will never draw its "maximum current" for "3 hours or more."

Cheers, Wayne
 
wwhitney said:
That will likely give you the largest load their respective branch circuits will see all year, but it still won't be a continuous load, as the burners are thermostatically controlled as well. Also, most induction cooktops have a ***** mode where they can power a burner at an elevated level for a limited amount of time. That alone ensures that the burner will never draw its "maximum current" for "3 hours or more."

Cheers, Wayne
Click to expand...
Agree.
Continuous Load.
A load where the maximum current is expected to continue for 3 hours or more. (CMP-2)
 
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