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Is it permissible to use a 3 phase RTI (ready to install) NQ panel for a 120/240v, 3ph-4w high-leg delta system?

Issue:
Electrical System application

Product Line:
Panelboards

Environment:
NQ

Cause:
High-leg 3phase

Resolution:
A standard 3 phase NQ panel can be used, but the user must abide by the notations provided in the Information Manual that is supplied with the panel. These notations state that "When wired for Delta Systems, phases A and C must be 120V to neutral, Phase B 208V to neutral. Connect only circuit breakers rated 240V AC minimum, NOT 120V or 120/240V, to phase B."

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