Hi,
I have an ungrounded transformer 23kV-1242Volts feeding a Variable frequency drive. We have 50/51 relay upstream and an outdoor breaker protecting the cables and transformers, VFDs. As the design requires, the system is ungrounded and does not include ground fault protection.
Is it required per NEC or ANSI/NEMA that ground fault protection (for personnel) is required for such systems? If so, how can that be accomplished?
Thanks for your help.
I have an ungrounded transformer 23kV-1242Volts feeding a Variable frequency drive. We have 50/51 relay upstream and an outdoor breaker protecting the cables and transformers, VFDs. As the design requires, the system is ungrounded and does not include ground fault protection.
Is it required per NEC or ANSI/NEMA that ground fault protection (for personnel) is required for such systems? If so, how can that be accomplished?
Thanks for your help.