Grouch1980
Senior Member
- Location
- New York, NY
Hi all,
So for a hotel project i'm working on, the incoming service to the building is 120/208 volts, 3 phase, 4 wire. We have a 2500 amp service switch (@ 120/208 volts) that feeds a 750 KVA step up transformer, thereby stepping up the voltage to 277/480 volts to feed equipment on the roof of the building. The 750 KVA transformer has a secondary disconnect switch (for secondary protection) sized at 1200 amps, with 1200 amp fuses (@ 277/480 volts). My question is, does this 1200 amp secondary switch / fuse need ground fault protection in accordance with section 230.95 of the NEC? I'm being told it does require it... but to me, the 1200 amp switch isn't a service switch... or is it?
Thanks!
So for a hotel project i'm working on, the incoming service to the building is 120/208 volts, 3 phase, 4 wire. We have a 2500 amp service switch (@ 120/208 volts) that feeds a 750 KVA step up transformer, thereby stepping up the voltage to 277/480 volts to feed equipment on the roof of the building. The 750 KVA transformer has a secondary disconnect switch (for secondary protection) sized at 1200 amps, with 1200 amp fuses (@ 277/480 volts). My question is, does this 1200 amp secondary switch / fuse need ground fault protection in accordance with section 230.95 of the NEC? I'm being told it does require it... but to me, the 1200 amp switch isn't a service switch... or is it?
Thanks!