Natfuelbilll
Senior Member
Here is the situation.
Medium voltage three phase feeder is being extended from existing manhole with three shielded cables and an insulated EGC. The feeder is to be installed in nonmetallic conduit and run into new manholes. Each new manhole has a local ground rod and bonding to installed metallic components (cable, rack, metal frame, etc.). Where splices are made in manholes the cable splice kit shield ribbon will be bonded to the EGC and the local manhole bonding.
At the last manhole the nonmetallic conduit extends out and then is adapted to metal sweep elbow and metal conduit that will exit the earth. The metal conduit will be connected to a metal box and additional metal conduit system. This first box is a pull-through box and will therefore not contain any splices.
1. Does the EGC need to be bonded to the box/conduit at the first metal box? It will be bonded at other downstream boxes where splices are to be made.
2 Does the end of the underground metal conduit need to be bonded where it meets the nonmetallic conduit? How?
Any specific NEC references are welcomed.
Thank you all Veterans for your service!
Medium voltage three phase feeder is being extended from existing manhole with three shielded cables and an insulated EGC. The feeder is to be installed in nonmetallic conduit and run into new manholes. Each new manhole has a local ground rod and bonding to installed metallic components (cable, rack, metal frame, etc.). Where splices are made in manholes the cable splice kit shield ribbon will be bonded to the EGC and the local manhole bonding.
At the last manhole the nonmetallic conduit extends out and then is adapted to metal sweep elbow and metal conduit that will exit the earth. The metal conduit will be connected to a metal box and additional metal conduit system. This first box is a pull-through box and will therefore not contain any splices.
1. Does the EGC need to be bonded to the box/conduit at the first metal box? It will be bonded at other downstream boxes where splices are to be made.
2 Does the end of the underground metal conduit need to be bonded where it meets the nonmetallic conduit? How?
Any specific NEC references are welcomed.
Thank you all Veterans for your service!