olly
Senior Member
- Location
- Berthoud, Colorado
- Occupation
- Master Electrician
It is legal to run 4/0 SER underground outside in a 2" conduit?
It is legal to run 4/0 SER underground outside in a 2" conduit?
It's not legal to run SEU or SER underground, regardless of whether it is in or not in a conduit. 338.12(A)(2). IMO, I don't understand why, or what the real life consequences of this are.
My understanding is that that water enters the conduit with all the mineral contents from the soil in it. It then seeps into the jacket and can eat away at the bare equipment grounding conductor.
Probably a manufacturers rule but no NEC rule that I know about. I got my info from southwire. Bare aluminum cannot be within 18 inches of the ground for termination and I suspect there is a reason for that so logic would suggest to keep it out of a conduit in the ground. I would definitely check the manufacturer-- I bet it would be a NO NOIs there any rule against pulling a bare AL EGC in an underground conduit?
Bare aluminum cannot be within 18 inches of the ground for termination
For GECs.
All I am saying is I don't understand the rule, I can use SER in wet locations. I can install bare AL EGCs in underground PVCs. But I cant put SER in an underground PVC.
I am not getting the logic used.
FWIW I am sure we will keep putting SER in PVC underground for temp feeders on construction sites.
My understanding is that that water enters the conduit with all the mineral contents from the soil in it. It then seeps into the jacket and can eat away at the bare equipment grounding conductor.