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Thread: 50A receptacle on 40A circuit okay?

  1. #16
    Plumber jimbo's Avatar
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    Just remember.....anything you say after hj has the last word, starts a new thread completely!

  2. #17
    DIY Senior Member SteveW's Avatar
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    Quote Originally Posted by Ian Gills View Post
    You did not say that. You said you could put any receptacle you want on a circuit as long as the breaker and the wire are sized correctly.

    You could not put a single 15 amp receptacle on a 20 amp circuit, for example. At least I wouldn't.

    Common sense.
    I realize this is quite correct as far as the NEC, but the logic of it escapes me.

    I don't see how a 15-amp receptacle on a 20-amp circuit is a safety hazard. What am I missing?

  3. #18
    Retired Defense Industry Engineer jadnashua's Avatar
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    Most receptacles can pass through more current than they can source at an individual outlet and Ian is wrong...you can use 15A devices on a 20A circuit. Although, if you have some one thing that can monopolize the circuit's max current, it's sort of nice to size the outlet for that user.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #19
    DIY Member Artie's Avatar
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    For what its worth, twice a year, (Thanksgiving and Christmas), pretty much every burner on the cooktop, and both ovens of the double oven, are going full speed.

  5. #20
    Plumber jimbo's Avatar
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    IN THEORY....a 15 amp equipment could have an internal fault, and since the breaker wouldn't pop until 20, damage or overheating could occur since internally, the equipment is designed to be protected by 15 amps max. This is a stretch of an argument, and the NEC apparently feels comfortable enough to allow it. I do understand that the Canadian Electrical code does NOT allow it.

  6. #21
    Electrical Contractor/Instructor jwelectric's Avatar
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    Quote Originally Posted by SteveW View Post
    I realize this is quite correct as far as the NEC, but the logic of it escapes me.

    I don't see how a 15-amp receptacle on a 20-amp circuit is a safety hazard. What am I missing?
    As long as there are more than one receptacle then 15 amp devices on a 20 amp circuit is permissible per the NEC. Look at the receptacles in your ktchen and bath

  7. #22
    Electrical Contractor Bobelectric's Avatar
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    I make the extra step and "pig Tail "all my receptacles rather than feed through.

  8. #23
    Senior Robin Hood Guy Ian Gills's Avatar
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    Good for you. That's good work.

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