cwilliamson
New member
If you have a single gang box in an existing bathroom wall is it okay to bring the 277v light wires and the 120v fan wires to a double pole-single throw switch or should I change the box and use dividers?
2002 NEC
404.8(B) Voltage Between Adjacent Devices. A snap switch shall not be grouped or ganged in enclosures with other snap switches, receptacles, or similar devices, unless they are arranged so that the voltage between adjacent devices does not exceed 300 volts, or unless they are installed in enclosures equipped with permanently installed barriers between adjacent devices.
Barriers are required between switches that are ganged in a box and used to control 277-volt lighting on 480Y/277-V systems where two or more phase conductors enter the box. Permanent barriers would be required between devices fed from two different phases of this system because the voltage between the phase conductors would be 480 volts, nominal, and would exceed the 300-volt limit. Barriers are required even if one device space is left empty because the two remaining devices fed from different phase conductors would still be adjacent to each other. This requirement now applies to switches ganged together with any wiring device where the voltage between adjacent conductors exceeds 300 volts.
That sounds like a requirement on a multiwire branch circuit that I agree with, but the part that gets me is the 120v for the fan ......and then the 277v for the light.Originally posted by stamcon:
Two circuits suppling a single yoke device requires a 2 pole common trip breaker.