Adding an EGC

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ammklq143

Senior Member
Location
Iowa
Occupation
Electrician
I have a project that has a detached garage with a 200 amp service. Many years ago, they built a house and fed it with a 100 amp 3 wire out of the garage panel. Recently, they added a shop between the two so they are tied together now and the inspector said it needs an EGC added to tie them together. Is there anything that says the EGC can be run separately from the service conductors? Is there anything that would allow for a person to run a conduit from the garage panel to the house panel with the #8 EGC? I have one inspector that has allowed that but this one doesn't seem like he will.
Thanks
 
Assuming the present conductors are in a conduit:
300.3(B) Conductors of the Same Circuit. All conductors of the same circuit and, where used, the grounded conductor and all
equipment grounding conductors and bonding conductors shall be contained within the same raceway, auxiliary gutter,
cable tray, cablebus assembly, trench, cable, or cord, unless otherwise permitted in accordance with 300.3(B)(1)through
(B)(4).
 
augie47 said:
Assuming the present conductors are in a conduit:
300.3(B) Conductors of the Same Circuit. All conductors of the same circuit and, where used, the grounded conductor and all
equipment grounding conductors and bonding conductors shall be contained within the same raceway, auxiliary gutter,
cable tray, cablebus assembly, trench, cable, or cord, unless otherwise permitted in accordance with 300.3(B)(1)through
(B)(4).
Click to expand...
Also applicable if they are in a cable
 
augie47 said:
Assuming the present conductors are in a conduit:
300.3(B) Conductors of the Same Circuit. All conductors of the same circuit and, where used, the grounded conductor and all
equipment grounding conductors and bonding conductors shall be contained within the same raceway, auxiliary gutter,
cable tray, cablebus assembly, trench, cable, or cord, unless otherwise permitted in accordance with 300.3(B)(1)through
(B)(4).
Click to expand...
Unfortunately, the cables were direct buried from the garage to the sub panel that's in the house when it was done back in the 70's I believe.
 
I get it-- the garage is now attached to the house vis the shop. The inspector is correct and the 3 wire cable should have been replaced when the shop was added. Can you not run across the shop to get a new feeder to the garage?
 
Dennis Alwon said:
I get it-- the garage is now attached to the house vis the shop. The inspector is correct and the 3 wire cable should have been replaced when the shop was added. Can you not run across the shop to get a new feeder to the garage?
Click to expand...
Part of the new addition is a bedroom/bathroom, etc. and is finished so we can't run through there. Would have to trench in a new feeder.
 
The nec doesn't give us advise on that. Some inspectors may accept it but IMO, when the addition was adding then you changed the application of the feeder and it should be brought up to code.
 
You'll need to upgrade the feeder to include an EGC, unless you want to use the 3-wire feeder to install a transformer to create 4-wire system with a neutral.
 
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