1000 amp ATS

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We are installing a 1000 amp Automatic Transfer switch after the Main 1000 amp service switch,
Ther a re 3 lugs marked for the equopment grounds.What do I do with the grounds coming from the generator and from the service switch?
Please Help Thanks
 

ron

Senior Member
I'm not following the question. If there are 3 lugs, then one for incoming source 1, one for source 2 and one for the load equipment grounding conductors? Is there not enough to receive the quantity of conductor terminations?
 

augie47

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Tennessee
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State Electrical Inspector (Retired)
I forgot to say this is a 3 phase service

ron's answer in post #2 is correct on single phase or 3 phase.

sidebar: Is the neutral switched by the ATS ? Is the neutral bonded at the generator ?
 

augie47

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Location
Tennessee
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State Electrical Inspector (Retired)
No It is not switched at the ATS and yes it is bonded at the Generator
FWIW, that scenario does not go together. (fairly common problem, that's why I asked :D)
If the neutral is bonded at the generator and not switched by the ATS, you have a violation of 250.24(A)(5).
 

don_resqcapt19

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Location
Illinois
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retired electrician
Switched or not, there still needs to be terminal space for 9 ungrounded conductors and 3 grounded conductors if the system is a 3 phase wye system. It sounds like he has terminals for 3 EGCs and not for 3 grounded conductors.
 
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