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Is it acceptable by US NEC standards to have two switches in a double wall box that operate on entirely different circuits in a late 50's house?

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    Related: diy.stackexchange.com/questions/7958/…
    – Niall C.
    Commented Oct 16, 2012 at 14:53
  • As long as the voltage between adjacent devices does not exceed 300 volts (NEC 404.8, 406.4), and the box fill values (NEC 314.16) are not exceeded, there should be no problem.
    – Tester101
    Commented Oct 16, 2012 at 18:12
  • @Tester101 I can't even think of a home appliance that exceeds 300 volts. I think I am okay there ;-) Commented Oct 16, 2012 at 18:22
  • @maple_shaft You are correct, it's not likely you'll have to worry about that. Just figured I'd point it out.
    – Tester101
    Commented Oct 16, 2012 at 18:40

1 Answer 1

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Yes, it is.

As long as other requirements for wiring at met, there is no problem with two circuits (or 3, or 4!) in a box.

Consider, in fact, that code requires this for dishwasher and disposal installs today: Split the bridge on a receptacle and wire each outlet to a different circuit.

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