I have found an odd thing here in local area that electricians are telling me and again I am looking for some NEC guidance to support it.
In the past and from my experience it was acceptable in compliance to run 4/0-4/0-2/0 for service entrance conductors (using a 2/0 for the grounded conductor, or neutral).
For some reason people are stating that the local municipality doesn't want you to size the grounded conductor more than 80% different than the conductors. Which of course means that you can't use 2/0, the common SEC used in the local area is 4/0-4/0-4/0.
I ask, is this and can this be supported by the NEC or is it a local rule. FYI, I have read the local rules and have seen nothing in there that supports this.
rw
In the past and from my experience it was acceptable in compliance to run 4/0-4/0-2/0 for service entrance conductors (using a 2/0 for the grounded conductor, or neutral).
For some reason people are stating that the local municipality doesn't want you to size the grounded conductor more than 80% different than the conductors. Which of course means that you can't use 2/0, the common SEC used in the local area is 4/0-4/0-4/0.
I ask, is this and can this be supported by the NEC or is it a local rule. FYI, I have read the local rules and have seen nothing in there that supports this.
rw