KthOtto
Member
- Location
- Spokane WA
- Occupation
- Electrician
I work on a hospital campus with a single "Service Point" which I assume to be the load side of the MV meter to the 13.2MV main utility breaker in our hospital owned primary switchgear. From there we use 13.2KV loops around the campus. 13.2KV/208/120Y stepdown transformers sit outside facilities. As designed 10-15 years ago, we treat these transformers like they are utility owned and do not pull a ground into the facilities. We establish a ground at the main panelboard, bond the neutral, etc. We have new projects in the works and the A/E wants a ground pulled for the transformers to the building main. I assume he's treating these transformers like Separately Derived Systems downstream from the "Service". If we do this, I'm thinking I will need to pull grounds into any other facilities powered from the same transformer and float the neutral so I don't have two paths for fault current. A bit cloudy on this as is the Electrical Contractor.