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Can an NQ panel be used on a 240V 3PH Delta system ?
Issue:
NQ panelboards rated for a 240V 3 phase 3 wire delta voltage system

Product Line:
Panelboards

Environment:
NQ

Resolution:
Yes. Branch breakers must be 3P or QO--H / QOB--H and must carry a full 240V rating.
NOTE: This is not the same as a 240D/120VAC 3PH 4W system.
https://download.schneider-electric.com/files?p_enDocType=Catalog&p_File_Name=0100CT1901.pdf&p_Doc_Ref=0100CT1901&_ga=2.26496317.1434407716.1686064075-258592155.1681310191

Schneider Electric USA

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