210.6D

[Michael Napolitano]

Does 210.6D mean a 480-volt (single phase) lighting circuit can not be used to power a light fixture below 22 feet on a parking lot pole?
I don't know how I could ever measure more than 277-volts to ground on a 480-volt ( phase to phase) circuit.

 

[iwire]

480 from a 480Y/277 (Wye) supply is fine.

480 from corner grounded delta would not, 480 corner grounded delta would have two phases at 480 volts to ground.

 

[Smart $]

Does 210.6D mean a 480-volt (single phase) lighting circuit can not be used to power a light fixture below 22 feet on a parking lot pole?
I don't know how I could ever measure more than 277-volts to ground on a 480-volt ( phase to phase) circuit.

Your assuming the supply is going to be grounded 480/277. The requirement covers the possibility that it is not.

 

[Cavie]

480 volt to ground is common in highway lighting. Probably won't find it in a parking lot.