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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. Oct 16 '12 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 Oct 16 '12 at 18:12
@Tester101 I can't even think of a home appliance that exceeds 300 volts. I think I am okay there ;-) – maple_shaft Oct 16 '12 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 Oct 16 '12 at 18:40
up vote 4 down vote accepted

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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