NEC 210.6.D

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jriling

Member
Location
Ohio
A JOB I AM ASSOCIATED WITH HAS A 175W MH FIXTURE MOUNTED ON A 15' POLE FED WITH A 480V CIRCUIT.
I SAY THIS IS A VIOLATION. AM I RIGHT OR WRONG?
THE ENGINEER AND LOCAL INSPECTOR SAY THIS IS NOT A VIOLATION SINCE THE CIRCUIT FEEDING THE PANEL IS 480/277 3PH 4W. I SAY SINCE THERE IS NO NEUTRAL IN THE CIRCUIT FEEDING THE FIXTURE AND THE GROUND IS NOT A CIRCUIT CONDUCTOR THIS IS A VIOLATION.

ANY COMMENTS??

THANKS

JLR
 

hbendillo

Senior Member
Location
South carolina
Re: NEC 210.6.D

In your case, the voltage to ground should not exceed 277 volts so this should be alright. You do not need a neutral, just an equipment ground.
 

jmc

Member
Location
Massachusetts
Re: NEC 210.6.D

Section 210.6(C) of the NEC permits branch-circuits operating at 277 volts to ground. The fixture operates at 480 volts, but if you measure the voltage to ground it is 277 volts.
 

iwire

Moderator
Staff member
Location
Massachusetts
Re: NEC 210.6.D

480 volt HID lighting is a very common and efficient way to light large spaces. With the higher voltage you can either put more lights on a circuit, or you can decrease wire and conduit size.
 
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