Dwelling unit single range questions

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cppoly

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For a 12 kW range, the allowable demand on the branch circuit is 8 kW?

Would the conductors be sized for non continuous load?

8,000 ? 240 = 33.3 amps calls for 35 amp CB with 35 amp wire?
 
Thanks Dennis.

210.19(A)(3) also says branch circuit conductors shall have an ampacity not less than the rating of the branch circuit and not less than the maximum load to be served.

If the range is 12 kW, wouldn?t the maximum load to be served be 12 kW? This would required 12,000 / 240 = 50 A ampacity?
 
cppoly said:
Thanks Dennis.

210.19(A)(3) also says branch circuit conductors shall have an ampacity not less than the rating of the branch circuit and not less than the maximum load to be served.

If the range is 12 kW, wouldn?t the maximum load to be served be 12 kW? This would required 12,000 / 240 = 50 A ampacity?
Click to expand...


The load to be served IMO is what the demand factor of T. 220.55 allows. This has been argued many times here in the [past. Ranges have thermostats that cycle on and off so the actual load is never the entire 12kw. Interestingly enough- as I said before- a 16kw range would also only require a 40 amp circuit. Now one may pause at that but that is what would be allowed by the residential table of 220.55
 
Would the receptacle sizing fall under 220.55? Or would the receptacle have to be sized to handle the maximum wattage? 40 amp receptacle vs 50 amp receptacle...
 
cppoly said:
Thanks Dennis.

210.19(A)(3) also says branch circuit conductors shall have an ampacity not less than the rating of the branch circuit and not less than the maximum load to be served.

If the range is 12 kW, wouldn?t the maximum load to be served be 12 kW? This would required 12,000 / 240 = 50 A ampacity?
Click to expand...

Ahhh...your digging in the weeds now my friend. We don't like weed diggers here...lol...just kidding
 
Dennis Alwon said:
Range is a non continuous load so I agree with what you have there except 40 amps is the smallest allowed
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I would agree if the range is 8 3/4 KW or larger as stated in the last sentence of 210.19(A)(3). Oh...and yes I do agree with it not being a continuous load....;)
 
cppoly said:
Thanks Dennis.

210.19(A)(3) also says branch circuit conductors shall have an ampacity not less than the rating of the branch circuit and not less than the maximum load to be served.

If the range is 12 kW, wouldn?t the maximum load to be served be 12 kW? This would required 12,000 / 240 = 50 A ampacity?
Click to expand...

Nope...because the scope of Article 220 says how I calculate the load....then we see Section 220.55 and table 220.55 elaborate on that fact, along with that pesky note # 4 to the table.






 
Dennis Alwon said:
The load to be served IMO is what the demand factor of T. 220.55 allows. This has been argued many times here in the [past. Ranges have thermostats that cycle on and off so the actual load is never the entire 12kw. Interestingly enough- as I said before- a 16kw range would also only require a 40 amp circuit. Now one may pause at that but that is what would be allowed by the residential table of 220.55
Click to expand...


So basically any cooking unit rated 16,000 watts and under will always be safe on a 40 amp circuit?
 
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