Hey all,
I have a 3ph 75kVA transformer that is fed from MCC bucket with breaker of 200A from 2 phases only. So I have 3/0 from each phase (2 only) to the transformer. Now I know the ground wire is the EGC and I sized it to be #6. The confusion I have is because I'm running 2 sets of 2/0 in the secondary to ATS and then to multiple panels.
The SSBJ sized to be #2, the SBJ is sized to be #2, and the GEC for the transformer is sized to be #2. It feels weird kinda "tapping" #6 with two #2.
Am I missing something? I know it's not carrying current and I would argue the fault from the secondary is greater than the primary and the transformer GEC cover both. But want to make sure.
Second question:
I consider all the cable from the transformer to ATS to the junction box to panels to be SSBJ. Is that correct? The cable to each panel is smaller in size and so is the SSBJ for the panels.
I have a 3ph 75kVA transformer that is fed from MCC bucket with breaker of 200A from 2 phases only. So I have 3/0 from each phase (2 only) to the transformer. Now I know the ground wire is the EGC and I sized it to be #6. The confusion I have is because I'm running 2 sets of 2/0 in the secondary to ATS and then to multiple panels.
The SSBJ sized to be #2, the SBJ is sized to be #2, and the GEC for the transformer is sized to be #2. It feels weird kinda "tapping" #6 with two #2.
Am I missing something? I know it's not carrying current and I would argue the fault from the secondary is greater than the primary and the transformer GEC cover both. But want to make sure.
Second question:
I consider all the cable from the transformer to ATS to the junction box to panels to be SSBJ. Is that correct? The cable to each panel is smaller in size and so is the SSBJ for the panels.