Trevor, 250.148 states that if there is a splice in the ungrounded conductors, then the EGC must be bonded to the box. That might not mean we have to break it and splice it to bond it, but chances are good that you do.
Originally posted by georgestolz:
I'm well qualified. I took a stand on the wrong side of this section recently, and got my shoe handed to me.
Don't ask me what that means.
[ January 07, 2006, 03:31 AM: Message edited by: LarryFine ]
No, Trevor was correct in his statement. If you had a box where none of the ungrounded circuit conductors were spliced in the box, no splice (or bond to the box) would be required.
The good example of this would be a set of large conductors say 750Kcmil in EMT going through a pullbox. You wouldn't be required to bond the EGC to the box after the pull. You would simply put the cover on.
I agree and have simply put the cover on many times.
Well I must be missing something, give the code reference so I can correct my way of interpeting 250.148.
And why wouldn't you bond the EGC for the 750kcmil, it wouldn't be that hard, a big pull box, plenty of room, for the say a #2 thhn EGC?
Originally posted by Jhr:
Well I must be missing something, give the code reference so I can correct my way of interpeting 250.148.
250.4(A)(3) is the key to your thinking, Jhr. Yes, the box must be bonded, because 250.4(A)(3) says so. But 250.148's opinion on how it should be done is mute, since there are no spliced circuit conductors in the box. Just because .148 can't be applied doesn't relieve the requirement that the box must be bonded in general.
And why wouldn't you bond the EGC for the 750kcmil, it wouldn't be that hard, a big pull box, plenty of room, for the say a #2 thhn EGC?
First to be clear the metal can must be bonded, but that can be accomplished through the metal raceway.Originally posted by Jhr:
Well I must be missing something, give the code reference so I can correct my way of interpeting 250.148.
Ok, but lets say I'm installing some underground circuits: 3/4" PVC, metal 6x6x4 Nema 3 J-Boxes and in two of theses boxes the ungrounded conductors pass thru no splice, do I not bond the EGC to the box
. Besides the example of the 750 Kcmil is way off target, those type of runs are usually reserved for service applications.I don't know but I think we got way off the original question and there he should bond.
The metal box must be bonded. If the conduit is EMT and the conductors only pass through then no connection to the EGC (if there is one) is required. If the conduit is PVC then the box must be bonded to the EGC since the raceway will not be an EGC.
Underground?
Now come on don't misqoute me I never said the larger conductors are "ONLY USED FOR SERVICES", but if you feel the EGC dosent have to be bonded to the box fine, but where does it say in the code, 250.148 also says circuit conductors that are been supported by the box, what does that mean.
