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220V stove wiring

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  • 220V stove wiring

    Hi all,
    First post here. I am going to purchase a replacement stove with a 7.4kw @240 V requirement. It uses a NEMA 14-50 plug. The current stove uses a 20A breaker in each leg of the circuit and is wired with 8 ga. When I do the math for the new stove, I get ~30A @240V. Does that mean that each hot leg of the circuit needs a 30A breaker?
    Thanks
    Jonathan

  • #2
    Re: 220V stove wiring

    i live in indiana. if you were here we would put in a 50a 2 pole breaker. are you 2 20a breakers side by side? if so take them with you and go buy the proper breaker. is this job going to be permitted? if so ask inspector. breid.............

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    • #3
      Re: 220V stove wiring

      Originally posted by summilux View Post
      Hi all,
      First post here. I am going to purchase a replacement stove with a 7.4kw @240 V requirement. It uses a NEMA 14-50 plug. The current stove uses a 20A breaker in each leg of the circuit and is wired with 8 ga. When I do the math for the new stove, I get ~30A @240V. Does that mean that each hot leg of the circuit needs a 30A breaker?
      Thanks
      Jonathan
      Your new stove requires a 40 amp 2 pole breaker. NEC 240-3(b). Number 8 wire is good on a 40 amp breaker. NEC Art. 310.16. 60 degree chart. (Romex) NM.
      Formula - 7.4kw x 1000 = 7400 Watts. 7400 watts divided by 240 = 30.83 Amps. So your wire size is fine, but you should install a 40 amp 2 pole breaker. You cannot install a 50 amp breaker if you have NM (Romex 60c) wire. The 50 amp cord and plug on the stove (range) can be combined with a 50 amp receptacle like you mention in your post.

      You are lucky to have #8 wire, as a 20 amp circuit only requires #12.
      Are you in the US.?

      If the stove is listed for a 50 amp circuit then you must use a 50 amp circuit. The KW you post is only 30.83 amps. Double check. Something does not sound right.
      Last edited by John Valdes; 05-12-2010, 07:48 PM.
      Licensed Electrician

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      • #4
        Re: 220V stove wiring

        Originally posted by John Valdes View Post
        You are lucky to have #8 wire, as a 20 amp circuit only requires #12.
        Are you in the US.?

        If the stove is listed for a 50 amp circuit then you must use a 50 amp circuit. The KW you post is only 30.83 amps. Double check. Something does not sound right.
        I am happy to have #8. The previous owner of out house did somethings really right with his renovation. The kitchen has 5 separate circuits (one each for fridge, DW, microwave, outlets and then lights). Other things are really sketchy: 2nd floor Jacuzzi has an extension cord dropped through the framing and then plugged into the basement workshop room. He also tiled the DW into the countertop!

        I am mystified as to why the new stove has a 50A plug on it. There is no need for it.

        I'm in Canada (Ontario) if that matters.

        Jonathan

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        • #5
          Re: 220V stove wiring

          Originally posted by summilux View Post
          I am happy to have #8.

          I am mystified as to why the new stove has a 50A plug on it. There is no need for it.

          I'm in Canada (Ontario) if that matters.

          Jonathan
          The reason for a 50 amp plug, is they don't make a 30 amp plug for a range.
          You can get a 30 amp plug for a dryer, or a 50 for the range.

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