Service Entrance Ground Sizing

[infinity]

Are you sure 3" is correct ?
It works for COMPACT conductors....table C.1(A) but NOT for standard stranding table C.1.
I didn't think CU compact conductors were a normal product line....typical for aluminum.

You're correct, I said Sch80 but actually read the table for RMC. The OP didn't specify raceway type, for RMC he's good.

 

[wwhitney]

You're correct, I said Sch80 but actually read the table for RMC. The OP didn't specify raceway type, for RMC he's good.

From Chapter 9, Table 4, it appears that the wall thickness on RMC corresponds to something between Schedule 30 and Schedule 40. I'm assuming that the outer diameter of RMC follows the standard Iron Pipe Sizes.

Cheers, Wayne

 

[charlie b]

But was I wrong to say that an SSBJ is needed, and that it needs to be 700 MCM?

I am now thinking that I was wrong, at least about the size. Apparently, the rule about a full-size EGC in each parallel conduit is not applicable to the SSBJ. I now believe that 250.102(C)(2) says to size the SSBJ in each conduit based on the ungrounded conductors inside that conduit. So if you have a 500 MCM as the ungrounded conductor in each of 11 conduits, the SSBJ in each conduit needs to be only 1/0 copper. Can I get a cross check on this?

I am going to open a new thread just to talk about the SSBJ.