ATS grounding..

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B4T

B4T

Senior Member
Location
Long Island, N.Y.
I have a few questions on (2) different installations I am doing..

1) 200a ATS.. (3/0 CU.) with no WP.. have (2) existing #6 to grd. rods to ATS.. from ATS to panel do I need #4 CU. or #6 as per 250.66?

2) 400a service.. (500 KCM CU.) with (2) 200a ATS.. no WP.. do I run #2 CU. as per 250.66 between ATS's and to existing grd. rods?

This section is my grey area..but is main electrode and not supplemental..


(E) Supplemental Electrode Bonding Connection Size.
Where the supplemental electrode is a rod, pipe, or plate
electrode, that portion of the bonding jumper that is the sole
connection to the supplemental grounding electrode shall
not be required to be larger than 6 AWG copper wire or 4
AWG aluminum wire.
 
Assuming your ATS units are service rated, from your 200 amp since you have OCP a #6 is all that's needed per 250.122

On your 400 amp, if you have (2) ATS that are service equipment you can run (1) GEC from each to your ground rods or you can one one common GEC and tap to it from each unit again with a #6 as that is the largest needed for a ground rod.
If you were going to a water line your common conductor would probably be a 1/0
 
augie47 said:
Assuming your ATS units are service rated, from your 200 amp since you have OCP a #6 is all that's needed per 250.122

On your 400 amp, if you have (2) ATS that are service equipment you can run (1) GEC from each to your ground rods or you can one one common GEC and tap to it from each unit again with a #6 as that is the largest needed for a ground rod.
If you were going to a water line your common conductor would probably be a 1/0
Click to expand...

The ATS on both jobs are service rated..

On the 400a job I am trying to sell them an upgrade on the grounding since a WP has been installed.. so the 1/0 might be a better idea..

If they go for the upgrade.. I would need a #4 cu. from each ATS to 200a panel?
 
augie.....

I have a post going real close to this one.............if there were no wp , you could drive 2 rods hit them with #6's even on a lets say a 1200 amp service?
 
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