Do you know what NFPA standard would dictate when a switchgear is required between a transformer secondary and 690v VFD panel? Would you know what section in the code book would specify the criteria for making this decision? Thank-you for your help.
NFPA 70B is a recommended practice that is used for preventive maintenance of electrical equipment. ... It is my opinion that OSHA drives this standard as well as the National Electrical Code (NEC) and NFPA 70E that deals with electrical safety.
In NFPA 70B you will find recommended and general industry standards for the frequency and type of maintenance to perform. That, in my opinion would be a good place to start.
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