brantmacga
Señor Member
- Location
- Georgia
- Occupation
- Former Child
I'm at a building w/ three tennant spaces, and two of them I am doing the remodel on. The first has a 200A service, and the second has a 400A service. The space next door has a 600A service.
Now the question:
The two spaces I have used to be one space, but were divided several years ago. In the space w/ the 400A service, the service used the copper water pipes in the slab as the grounding electrode. This connection was made at a water heater. The water heater has been removed and that area is now part of a hallway, and the pipes are being cut flush w/ the floor. The pipes went into the slab and fed the space next door, and I have no pipes accessible to me to ground this service to. Would it be acceptible to move the 1/0 GEC to the building steel and satisfy 250.58? Before answering, read on.
Now:
The 200A service in my other work area has its own grounding electrode, an 8' rod. The 600A service on the opposite side has a ground rod as well, and I don't know if it is bonded to the water pipes. So, would the best thing be to drive a couple of ground rods for my 400A service? Also, these panels are surface mounted on backer-boards; would the best thing be to A) run an EGC on the exterior of the building and connect the two services, or B) is running a bonding conductor to the building steel acceptable? I don't know if that 600A service in the other space is connected to the steel (other than the conduit straps) or the pipes. That space is currently occupied by a grocery store. My 400A service has also has a CT can that was connected to a ground rod (???), and that GEC has been cut in two; I've got to tie that back in to the main disconnect inside as well.
Anyway, if you've made it this far, thanks for a reply. I'm mostly concerned w/ moving this GEC to the building steel and being able to clear a fault. Maybe I need to seek permission to go in the grocery store and check out their service grounding.
Now the question:
The two spaces I have used to be one space, but were divided several years ago. In the space w/ the 400A service, the service used the copper water pipes in the slab as the grounding electrode. This connection was made at a water heater. The water heater has been removed and that area is now part of a hallway, and the pipes are being cut flush w/ the floor. The pipes went into the slab and fed the space next door, and I have no pipes accessible to me to ground this service to. Would it be acceptible to move the 1/0 GEC to the building steel and satisfy 250.58? Before answering, read on.
Now:
The 200A service in my other work area has its own grounding electrode, an 8' rod. The 600A service on the opposite side has a ground rod as well, and I don't know if it is bonded to the water pipes. So, would the best thing be to drive a couple of ground rods for my 400A service? Also, these panels are surface mounted on backer-boards; would the best thing be to A) run an EGC on the exterior of the building and connect the two services, or B) is running a bonding conductor to the building steel acceptable? I don't know if that 600A service in the other space is connected to the steel (other than the conduit straps) or the pipes. That space is currently occupied by a grocery store. My 400A service has also has a CT can that was connected to a ground rod (???), and that GEC has been cut in two; I've got to tie that back in to the main disconnect inside as well.
Anyway, if you've made it this far, thanks for a reply. I'm mostly concerned w/ moving this GEC to the building steel and being able to clear a fault. Maybe I need to seek permission to go in the grocery store and check out their service grounding.
