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Monday, November 16, 2020
Question:
Hello,
Can I install two switches in a two-gang switch box for 277-volt lighting switch legs without having a barrier between the switches? There is only one circuit in the box. Thanks for the help.
Max Truland
A
Answer:
Hi Max,
Thanks for the question. A barrier between the switches is required if the voltage between the circuits exceeds 300 volts. In this case, based on the question, the voltage in the box does not exceed 277 volts to ground. See NEC Section 404.8(B).