Ole electric
Member
- Location
- MetroWest Boston
Hello all,
Electrician here that may need a transformer wiring refresher on a common problem!
I have a machine that requires 240v 3 phase 50a and I chose to supply through a 480x240/120 center tap delta/delta 30kva xfmr since my building has 480 or 208 available.
there is no terminal XO, just X4 for the 120
I have no reference to ground from any phase on the secondary at the machine disconnect. Do I need to provide? Not sure if I have to corner ground??
I don't think there is a delta/wye xfmr at these voltages like the common 480x120/208
Thanks!
Ole Electric
Electrician here that may need a transformer wiring refresher on a common problem!
I have a machine that requires 240v 3 phase 50a and I chose to supply through a 480x240/120 center tap delta/delta 30kva xfmr since my building has 480 or 208 available.
there is no terminal XO, just X4 for the 120
I have no reference to ground from any phase on the secondary at the machine disconnect. Do I need to provide? Not sure if I have to corner ground??
I don't think there is a delta/wye xfmr at these voltages like the common 480x120/208
Thanks!
Ole Electric