A panel is being added on the outside of this transformer. 120/208 3PH w/ 100A main c.b. ---- A, B, C and N--- Can the G come from the existing rod in the bottom of pic or does a new one need added.....outside of the xfmr? Thanks much.
Adding Panel
- Thread starter zooby
- Start date
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Is this a utility transformer? Will the new panel be a service?
13200/ 120-208 we own them. ?well.... is being added to feed a hay chopper about 10ft away from the panel being added. Circuits will not serve the existing building that is fed out of the xfmr. panels inside building are full. So I am not sure if its a "service" or not.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
If the transformer is after the service point then your panel will not be a service and the feeder conductors from the transformer would require a SSBJ. If using a type of metal raceway that qualifies as an EGC no wire type SSBJ would be required. If you're installing a wire type SSBJ then it would be sized according to 250.102(C).
Infinity....I apologize if I am being dense here. Would our "service point " be where POCO enters our campus then? I guess technically , after the first POCO equipment we own everything else. Am I making too much of who owns what?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
No apology needed this stuff can be word soup.
If this new panel were a service panel it would contain a service disconnect. Between that panel and the transformer you would need only 4 conductors (A-B-C-N). The neutral would be bonded in the panel.
If this is not a service panel (which it sounds like it isn't) then you would need a SSBJ (5th conductor) between the transformer and the panel. The "5th conductor" can be a metal raceway.
Thanks very much. I get to reading and re-reading definitions until nothing adds up. Have a great weekend.No apology needed this stuff can be word soup.
If this new panel were a service panel it would contain a service disconnect. Between that panel and the transformer you would need only 4 conductors (A-B-C-N). The neutral would be bonded in the panel.
If this is not a service panel (which it sounds like it isn't) then you would need a SSBJ (5th conductor) between the transformer and the panel. The "5th conductor" can be a metal raceway.
Fred B
Senior Member
- Location
- Upstate, NY
- Occupation
- Electrician
are you suggesting actually physically drilling in and attaching to the xfer case?
- Location
- Illinois
- Occupation
- retired electrician
I don't see an issue with that. A local utility requires that for their CT meters installed with a pad mount transformer. The CTs are on the cables inside the low voltage compartment and the meter can is installed on the side of the low voltage compartment using a chase nipple and bolts.
Of course you do have to be careful where you drill.
Yes. I know it would be better to set it off to the side but circumstances are going to dictate otherwise this time. I have some appropriate shielding to use and when the time comes I'll place it in "Loop-Thru" for terminations.
Yes, when a campus owns its electrical distribution system, the service where the POCO (Power Company) enters the campus is the point where the POCO's lines connect to the campus's owned system. This point is the first point of contact for the POCO's electrical power within the campus's property.
The above AI answer helps me to get it thru my thick skull about what Infinity was saying in post #6.
