- Location
- New Jersey
- Occupation
- Journeyman Electrician
How would you size the branch circuit (240 volts) using this info from the unit spec?
Cooktop Branch Circuit
- Thread starter infinity
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- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
For one cooktop you need to use the nameplate rating of 11.1 which would be a 50 amp breaker
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Note 4 of Table 220.55
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Doesn't that table say one unit 12 kW or less you can use 8 kW for the branch circuit?
8000/240=33 amps or 40 amp circuit
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
That is for the load on the service/feeder, note 4 is for branch circuit. So in your case it is nameplate rating of 50A.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Ah, the table is only for one range. Got it.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Yes the table says that however the note to the table specifically states one oven at nameplate
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Unless I'm not reading this correctly you need to differentiate between range and wall oven. The table applies to ranges according to the note #4 that you posted.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
I think you are not reading Dennis' post correctly.
You two are agreeing and saying the same thing.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
I'm not sure but you might be correct. I said range, he said oven, two different rules but maybe he meant range.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Yes, of course, you must differentiate between an oven and a range as they are not the same
A range is a cooktop with an oven. An oven is just an oven and a cooktop is just the burners. If you wire a cooktop and an oven then you can calculate the circuit as one range. For instance an 8kw cooktop and a 7 kw oven can be calculated to be the same as 1 - 15 kw range which would be 9.2kw.
Just an oven is the nameplate..
A range is a cooktop with an oven. An oven is just an oven and a cooktop is just the burners. If you wire a cooktop and an oven then you can calculate the circuit as one range. For instance an 8kw cooktop and a 7 kw oven can be calculated to be the same as 1 - 15 kw range which would be 9.2kw.
Just an oven is the nameplate..
- Location
- New Jersey
- Occupation
- Journeyman Electrician
When applying note #4 (I've broken it down into three different sections) tell me if this looks correct:
A) Use the kW rating of the range with T220.55.
B) Use the kW rating for the wall-mounted oven or counter-mounted cooking unit.
C) Use the kW rating of the counter-mounted cooking unit and wall-mounted oven added together and T220.55 as if it were a single range.
I mention this (using only the kW ratings) because if you look at the spec in post #1 you'll see different kW ratings but the same 50 amp rating for both voltages.
A) Use the kW rating of the range with T220.55.
B) Use the kW rating for the wall-mounted oven or counter-mounted cooking unit.
C) Use the kW rating of the counter-mounted cooking unit and wall-mounted oven added together and T220.55 as if it were a single range.
I mention this (using only the kW ratings) because if you look at the spec in post #1 you'll see different kW ratings but the same 50 amp rating for both voltages.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Your analysis is correct Trevor.
If you divide the kw's by the perspective voltages they both come in at 46 amps so a 50 amp is appropriate using either voltage.
If you divide the kw's by the perspective voltages they both come in at 46 amps so a 50 amp is appropriate using either voltage.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Note 4 applies to the branch circuit. For a single oven or single cook top - you must use appliance rating for the branch circuit, but can use the table for demand rating to apply to a feeder or service. Now throw in a feeder that only supplies the one branch circuit....:blink:
jumper
Senior Member
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- 3 Hr 2 Min from Winged Horses
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