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Voltage: 480v Delta circuit

Will the 480v lead work on a delta circuit or if it is on a wye (Y). 

 

The 2005 NEC had a rule change about 480V ungrounded delta circuits, not allowing luminaires on these circuits. See attached 2014 NEC reference.

It may be that there are currently fixtures installed (under a previous version of the Code), but installing new fixtures would be a violation.

So our recommendation is to not use these (TWP LED) luminaires in this application.

There was also some trepidation on behalf of our driver supplier, providing further reason to avoid this application. That said, 

Grounded 480V delta circuits are OK.

 Ungrounded 480V delta circuits are not OK.

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