Hugh W
Member
- Location
- Mebane, NC
Is the neutral bus bar required to be bonded in lighting panel being supplied by 480V 4-wire breaker?
Neutral Bonding on 480/277V Lighting Panel
- Thread starter Hugh W
- Start date
- Status
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
It does not matter whether this is a lighting panel or whether it serves HVAC equipment. It also does not matter whether it is 480/277 volts or 120/208 volts. If there is a panel upstream (i.e., this is not the first panel that is connected to a transformer secondary), then its N and G bars must not be connected to each other.
jaggedben
Senior Member
- Location
- Northern California
- Occupation
- Solar and Energy Storage Installer
When you say '4-wire breaker' you're being very unclear. Presumably you should be saying '4-wire feed', since there aren't many systems where 4 wires go to the breaker. Beyond that, do these 4 wires consist of 3 hots and a neutral, or 2 hots, 1 neutral, and 1 ground? If the former, you'd better have some other form of ground, such as metal conduit. In any case I agree with the previous post: no, you don't bond the neutral.
Hugh W
Member
- Location
- Mebane, NC
Thanks for the replies. Should have stated 4-wire feeder.
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