When installing a range or cooktop (residential), I use the manufactures recommended circuit size found in the installation manual. When no manual is available, should I base the circuit on the nameplate rating or is it OK to base it on the load calculations from the 220 section of the NEC?
Sizing range and cooktop circuits
- Thread starter Vertex
- Start date
- Status
- Location
- Massachusetts
Vertex said:
IMO you always go by the nameplate, the manuals tend to be generic.
Than with the nameplate info you at least provide a circuit that article 220 requires.
Bob NH
Senior Member
- Location
- The "Live Free or Die" State
As Bob (iwire) said, start with nameplate rating.
You can then calculate the required ampacity of the circuit using the information in Table 220.55.
I provided some examples in Posts 21 and 29 at the following link. References are to the 2005 NEC.
http://forums.mikeholt.com/showthread.php?t=82561&page=3
If you are a glutton for punishing your mind, you can go through the whole thread.
There was a lot of discussion, but believe that in the end, the position that Table 220.55 may be used to calculate branch circuit requirements for a residential cooking appliance (range, or cook-top + wall-mounted oven) was sustained.
You can then calculate the required ampacity of the circuit using the information in Table 220.55.
I provided some examples in Posts 21 and 29 at the following link. References are to the 2005 NEC.
http://forums.mikeholt.com/showthread.php?t=82561&page=3
If you are a glutton for punishing your mind, you can go through the whole thread.
There was a lot of discussion, but believe that in the end, the position that Table 220.55 may be used to calculate branch circuit requirements for a residential cooking appliance (range, or cook-top + wall-mounted oven) was sustained.
barbeer
Senior Member
- Location
- Pinellas County, FL
Nameplate is good!:grin:
Bob NH
Senior Member
- Location
- The "Live Free or Die" State
barbeer said:
Yes, but!
If you put in a circuit based only on the nameplate rating of a 26 kW range, you will need a 110 Amp circuit.
If you use that 26 kW nameplate rating to find the circuit that is really required by Article 220.55 and Table 220.55, you will need only a 60 Amp circuit.
- Location
- Massachusetts
Bob NH said:
I sure would like to see a 26 KW household range.
And if the person can afford the kitchen that goes with that range I might sell them a 110 amp circuit.
But I do agree with you about the .55 question.
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