240V Range - Part 2


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Old 07-14-14, 07:03 AM
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240V Range - Part 2

I'm about to give a friend advice on if he should purchase an electric or gas oven. I want to make sure I'm right.

He has a 40A Circuit, 1 Black, 1 White, and Bare Ground.

This doesn't sound right to me. I think (For 3-Wire Grandfathered Rule)

It should be 2 Hot Wires and 1 Insulated Neutral.

So should I tell him "No Go" on the Black, White and Bare Ground??

Thanks.

(He had an electric oven there before with clock and controls, could these controls have been 240V??)
 
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Old 07-14-14, 07:09 AM
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I would go with an electric over but it sounds like he may need to run more wire.
 
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Old 07-14-14, 07:12 AM
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He has a 40A Circuit, 1 Black, 1 White, and Bare Ground.

This doesn't sound right to me. I think (For 3-Wire Grandfathered Rule)

It should be 2 Hot Wires and 1 Insulated Neutral.

So should I tell him "No Go" on the Black, White and Bare Ground??
IF it's a 240 volt appliance, all that is needed is two insulated conductors and 1 ground, bare or green. That being said, electric ranges are normally 120/240 volt and need a neutral in addition to the two insulated hot wires, but you state this is just an oven and some ovens only require a 240 volt circuit. The 3-wire grandfathered rule you mention is for 120/240 volt range circuits. In this case, I suggest consulting the appliance installation manual to determinbe the actual voltage and overcurrent protection required. If you post the manufacturer's name and model number, someone here can help you.
 
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Old 07-14-14, 09:21 AM
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My Bad,
This is a free standing range, or a slide in.

I don't think you're going to find many (or any) ranges running off straight 240.

Agreed? Should he even bother looking?

Thanks.
 
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Old 07-14-14, 09:31 AM
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This is going to depend on the wiring method. If you have SE cable you have two hots and a neutral.
 
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Old 07-14-14, 10:07 AM
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This is going to depend on the wiring method. If you have SE cable you have two hots and a neutral.
Agreed. SE cable would probably be grandfathered if it is an existing range circuit. But, if the cable is NM cable (aka romex) such as 8-2 w/G or 6-2 w/G it was never compliant and must be replaced with a 4-wire circuit.
 
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Old 07-14-14, 10:53 AM
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But, if the cable is NM cable (aka romex) such as 8-2 w/G or 6-2 w/G it was never compliant and must be replaced with a 4-wire circuit
My question is answered. I will recommend he pulls new cable or abandon Idea of electric range.

But I always want to learn more. If someone has the time:

I looked at SE Cable, It looks the same as Romex to me. It has insulated conductors within sheathing, with ground.

What's the difference, Colors of Wires within? Or maybe the configuration of wires? I noticed SE is wrapped in plastic and then sheathed. My best guess is that it can withstand higher temps.

Thanks for your time.
 
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Old 07-14-14, 01:47 PM
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SE cable was listed for use for stoves. The bare could be used as a neutral. Type NM cable was not allowed to use the bare as the neutral.
 
 

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