hhsting
Senior Member
- Location
- Glen bunie, md, us
- Occupation
- Junior plan reviewer
Attached sketch shows 4# 500kcmil service conductors from utility CT meter cabinet into trough. From trough cable 4#500kcmil is tapped 4#3/0AWG into each 200A fused service disconnect. The trough does not have any neutral bus, any phase bus only phase and neutral cables.
The two service disconnects 200A has main bonding jumper shown attached sketch and grounding and bonding method is NEC 2014 section 250.64(D)(1) . Each service disconnect is tapped with #4 AWG grounding electrode conductor tap which is routed in same conduit that contain 4#3/0 AWG phase and neutral conductors each 200A fused disco conduit to 0.25 inch x 2 inch ground bus bar in the trough.
The ground bus bar inside trough has grounding electrode conductors to steel, water pipe underground, concrete encased electrode. Their is also bonding jumper from ground bus bar to trough.
Question:
1. NEC 2014 section 250.80 says all grounding and bonding supply side need to be by neutral. I don’t have neutral bus only neutral cable which is tapped to provide conductors for service disco. How can one place bonding jumper from neutral cable to trough?
2. Would bonding jumper from trough to ground bus bar acceptable or does it have to come from neutral cable?
3. If neutral cable has bonding jumper to trough enclosure then would ground bus bar also need to have the bonding jumper to trough enclosure?
4. How does one do grounding and bonding in trough with service phase and neutral conductor and ground bus bar for 250.64(D)(1) in trough line side of service disco based on NEC 2014 250.80 or 250.92 or some other section? If other section then which one?
The two service disconnects 200A has main bonding jumper shown attached sketch and grounding and bonding method is NEC 2014 section 250.64(D)(1) . Each service disconnect is tapped with #4 AWG grounding electrode conductor tap which is routed in same conduit that contain 4#3/0 AWG phase and neutral conductors each 200A fused disco conduit to 0.25 inch x 2 inch ground bus bar in the trough.
The ground bus bar inside trough has grounding electrode conductors to steel, water pipe underground, concrete encased electrode. Their is also bonding jumper from ground bus bar to trough.
Question:
1. NEC 2014 section 250.80 says all grounding and bonding supply side need to be by neutral. I don’t have neutral bus only neutral cable which is tapped to provide conductors for service disco. How can one place bonding jumper from neutral cable to trough?
2. Would bonding jumper from trough to ground bus bar acceptable or does it have to come from neutral cable?
3. If neutral cable has bonding jumper to trough enclosure then would ground bus bar also need to have the bonding jumper to trough enclosure?
4. How does one do grounding and bonding in trough with service phase and neutral conductor and ground bus bar for 250.64(D)(1) in trough line side of service disco based on NEC 2014 250.80 or 250.92 or some other section? If other section then which one?