sub panel in garage

[jad]

If a sub-panel is run to a garage from the house, which has 200amp 1 phase 3wire, does the ground wire need to be run with the conductors to the sub panel,(4 conductors) or can a ground electrode be installed at the garage and thus eliminate the ground wire in the pvc? The house is where the service entrance is and the conductors are buried in pvc to the garage. The neutral is isolated at the sub panel also.

 

[ryan_618]

Re: sub panel in garage

See 250.32 and 250.4(A)(5).

 

[infinity]

Re: sub panel in garage

Is this an attached or detached garage?

 

[ty]

Re: sub panel in garage

read my answer in your other thread. :roll:

 

[ty]

Re: sub panel in garage

It says:

There is not enough information to give you the absolute correct answer.

It might be possible to run 3-wires.
It depends on weather or not there are any other metallic paths between the two structures.
(If this is a detached garage).

Either way (if this is detached) you will need ground rod(s).

So,
Question #1:
Is this a detached garage?

Question #2:
Is there any metallic pathway between the 2(if it is detached)?

 

[romeo]

Re: sub panel in garage

Adding to ty's post. if the all requirements of 250.32(b)(2) are meet the grounded neutral conductor may serve as the ground fault current path,rather than using a 4th equipment bonding conductor.Yow said that the neutral was isolated at the sub panel it would have to be bonded to the panel enclosure and be grounded by way of a ground rod. IMO the 4 wire system is the safest and better method.

romeo