wirebender
Senior Member
- Location
- North Central Texas
I have an 800A fused 277/480 wye service entrance disconnect on the outside of a metal building feeding 2-400 panels immediately inside and directly behind the disco.
One panel feeds a 75kva 480/208 transformer sitting right next to it, with the 208 panel right next to the transformer on the other side.
The building steel does not qualify as an electrode, it is basically just the metal frame of the building.
No metal water piping.
Can I run the GEC for the transformer from the bonding point in the outside disconnect through the indoor panel with the feeders and then through the FMC with the supply conductors to the transformer?
Also, while researching this in the archives, I have come to the conclusion that the 225A, 208 wye panel will have to have a main breaker even though, IMO, it is protected by the 100 amp breaker feeding the transformer. Is this correct?
And do the 2-400A panels require main breakers?
It's past my bedtime, so I will check back tomorrow to answer any questions.
Thanks.
One panel feeds a 75kva 480/208 transformer sitting right next to it, with the 208 panel right next to the transformer on the other side.
The building steel does not qualify as an electrode, it is basically just the metal frame of the building.
No metal water piping.
Can I run the GEC for the transformer from the bonding point in the outside disconnect through the indoor panel with the feeders and then through the FMC with the supply conductors to the transformer?
Also, while researching this in the archives, I have come to the conclusion that the 225A, 208 wye panel will have to have a main breaker even though, IMO, it is protected by the 100 amp breaker feeding the transformer. Is this correct?
And do the 2-400A panels require main breakers?
It's past my bedtime, so I will check back tomorrow to answer any questions.
Thanks.