Paragraph 8 Polyphase meters

Every polyphase meter shall be tested on a circuit having a phase relationship for which the meters were designed. However, three phase, four wire polyphase meters may be tested without current in the neutral conductor.

When testing polyphase meters, 3 single phase or 2 single phase working standard precision kilowatt-hour meters or working standard watthour meters as appropriate may be used instead of polyphase working standard instruments.