Labeling of Panelboards

[Isaiah]

The client has a number of 3ph, 4W 480/277V Panelboards he wants to use as power panels, that is, 480V 3ph 3W- no neutral. To me this is misleading but does it violate the NEC?


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[Dsg319]

The client has a number of 3ph, 4W 480/277V Panelboards he wants to use as power panels, that is, 480V 3ph 3W- no neutral. To me this is misleading but does it violate the NEC?


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Can’t think of a reason why it would be an issue as long as the loads are straight 3phase.

 

[jim dungar]

The manufacturers label equipment based on their maximum possible voltage not on their supplied voltage.

If the source is 3 phase 4 wire a neutral conductor only needs to be present if there are Line -Neutral loads at that location.

 

[infinity]

The manufacturers label equipment based on their maximum possible voltage not on their supplied voltage.

If the source is 3 phase 4 wire a neutral conductor only needs to be present if there are Line -Neutral loads at that location.

I agree but it would be nice if the panelboard were field labeled 3Ø, 3W for anyone coming along in the future.

 

[Danielt]

I would get an insulated neutral bar kit, and run the neutral, unless these panels are already installed
I have cursed aloud when needing to add a circuit, only to find the panel 10' away has no neutral