Electric Built-In Cooktop

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dpenbert

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Does anyone see anything wrong with running 8/2 w/G to a single phase, 240V, 60HZ Electric Built-In Cooktop on a 40 amp circuit in a residence? The installation instructions say to use a 4-wire or 3wire Ac electrical supply. My foreman told me we should use 8/3 w/G.

Thanks,

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David - St. Louis,MO
 
Re: Electric Built-In Cooktop

Doesn't the cooktop actually require 120/240V. & not just 240V.

If that is the case you need 8/3 WG. Use the white insulated conductor as the "neutral".
 
Re: Electric Built-In Cooktop

The installation manual says it only requires 240V, thus two hot legs. I actually think I just answered my own question. I looked in section 250.140 Frames of Ranges and Clothes Dryers and this applies to counter-mounted cooking units. This refers to 250.134 and 250.138. Based on this I will need 8/3 w/G.

(Thanks Charlie)

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David - St. Louis,MO
 
Re: Electric Built-In Cooktop

If the unit does not require a neutral conductor, you do not need to install a 4 wire cable to the cooktop.
Your reference to 250.140 is for units the require a neutral conductor.
 
Re: Electric Built-In Cooktop

on the other hand if your boss told you to do, it might be in your best interest to do it. its not necessary but there may be other reasons to do it.

like maybe they don't stock the 2W cable but do stock the 3W cable.

and you never know what might get put in place of this unit down the road that might need a 3W connection.

[ October 13, 2005, 10:46 AM: Message edited by: petersonra ]
 
Re: Electric Built-In Cooktop

Some cooktops require a nuetral, some do not. If you run 4 wire circuit, you are safe. You may not need the nuetral, but someone else may in the future. If you do not run 4-wire, you should be sure that you do not need it. Also, most cooktops need no more than 10/3 copper and 30 amp breaker. Although 8/3 40 amp might be a good idea for same reasons as 4-wire instead of 3-wire.
 
Re: Electric Built-In Cooktop

We wire all cook tops and wall ovens in 8/3 as the normal install.There are so many different manufacturers out there that out size a 10/3 nm.But at the same time look at a 3.8 GE profile wall oven for instance all it needs is a 20 amp ocpd.Most cook tops we install have 5 kw and up,So to play it safe 8/3 is company policy.
Now if we were a small company that does a couple of hundred homes a year then we would get the specs. on rough and that #10 costs allot less than #8 does and the difference would have to be considered .But when you average 3000 homes a year thats over 57 homes a week averaged out.whereas 300 homes a year compared to 300 homes a year thats a bit over 5 @ week and at that ratio it pays tp be frivolous and see what exact kw rating will be.
 
Re: Electric Built-In Cooktop

Originally posted by dpenbert:
on a 40 amp circuit in a residence?
Thanks,

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David - St. Louis,MO
Click to expand...
210.19 (A) (3) Household Ranges and Cooking Appliances. Branch-circuit conductors supplying household ranges, wall-mounted ovens, counter-mounted cooking units, and other household cooking appliances shall have an ampacity not less than the rating of the branch circuit and not less than the maximum load to be served. For ranges of 8? kW or more rating, the minimum branch-circuit rating shall be 40 amperes.
Click to expand...
No one had answered the part of the 40 amp so I have added my two cents worth.
:)
 
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