US apppliance power limits

Discussion in 'General Electronics Chat' started by headingwest, Sep 26, 2012.

  1. headingwest

    Thread Starter New Member

    Sep 26, 2012

    I'm designing an appliance controller and need to rate my triacs. What is the maximum amperage for a domestic appliance in the US on a standard circuit?

    It's easy in Australia, you can have a maximum 2400W on 240V = 10amps.

    But I can't find the same guidelines for the US.

    Thanks for your help.
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    Household or commercial appliances?
    Frankly you need to review the NEC (NFPA 70) and ALL other UL standards that your device will fall into...
    Could be 20 Amps all the way up to 150 Amps for commercial.

    If your "device" does not have a certified UL listing you aren't going to be selling it here.. Get out your checkbook.. Its NOT cheap by any means..
  3. Audioguru

    AAC Fanatic!

    Dec 20, 2007
    An ordinary North American household 120V receptacle is fused or has a circuit breaker of 15A but short duration surges can be much higher.

    A "special" 120V receptacle can be 30A.

    My 240V stove and clothes dryer use 40A breakers.
  4. PackratKing

    Well-Known Member

    Jul 13, 2008
    Greetings Guru !! Right on all points.............however, if you look closer at your dryer, one hot lead runs the drum motor, and the other feeds the heat coil, unless I have hoof-in-mouth and your dryer is gas........:D
  5. Audioguru

    AAC Fanatic!

    Dec 20, 2007
    I have never seen the wiring diagram for my clothes dryer since it is against a wall and the vent pipe does not allow it to be moved.
  6. shortbus

    AAC Fanatic!

    Sep 30, 2009
    I think you'll find that one of the "hot" leads and neutral feed the motor and controls in a dryer. And the heaters use both "hot" leads, no neutral.