buzzbar
Senior Member
- Location
- Olympia, WA
- Occupation
- Electrical Contractor
Hi all,
I'm working on a marina, that has a transformer out in the middle of a floating dock. There is 480V feeding the primary side, and 120/208V on the secondary side. My question is about the grounding electrode conductor.
The transformer is being fed from shore with G cable. What requirements would all of you see for the grounding electrode conductor on the separately derived system? I'm thinking that a #6 CU going from the secondary side of the transformer, back to a ground rod driven at the shore line would comply.
Or, I was also thinking that one of the ground wires in the G cable (there are four of them) could be used as the GEC.
Or, is it okay to just bond to the metal on the primary side, with a wire sized according to 250.66?
Any thoughts?
I'm working on a marina, that has a transformer out in the middle of a floating dock. There is 480V feeding the primary side, and 120/208V on the secondary side. My question is about the grounding electrode conductor.
The transformer is being fed from shore with G cable. What requirements would all of you see for the grounding electrode conductor on the separately derived system? I'm thinking that a #6 CU going from the secondary side of the transformer, back to a ground rod driven at the shore line would comply.
Or, I was also thinking that one of the ground wires in the G cable (there are four of them) could be used as the GEC.
Or, is it okay to just bond to the metal on the primary side, with a wire sized according to 250.66?
Any thoughts?