dave121
Member
- Location
- Central Wisconsin
A couple grounding questions. The power co. supply is a corner grounded delta. 3 wires only. B phase is grounded at the service disconnect. This feeds a 3 phase 480 v. primary, 120 v./ 208 v. secondary delta/Y transformer.
First part. Correct me if I'm wrong, but the secondary, 0 term. is to be bonded to the trans. frame, and connected to the grounding system, ( building structure or water pipe ) and electrode. With the 0 term also being the neutral terminal for the 120 v. load if any.
Second. Feeding the primary side from the service disconnect, 3 wires only to the transformer, no bonding to the frame, and no 4 th. wire from the service disconnect? In the disconnect slugs in the B phase instead of fuses.
First part. Correct me if I'm wrong, but the secondary, 0 term. is to be bonded to the trans. frame, and connected to the grounding system, ( building structure or water pipe ) and electrode. With the 0 term also being the neutral terminal for the 120 v. load if any.
Second. Feeding the primary side from the service disconnect, 3 wires only to the transformer, no bonding to the frame, and no 4 th. wire from the service disconnect? In the disconnect slugs in the B phase instead of fuses.