200 amp service rated Generac T Switch

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jeramiepluemer

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Location
Wisconsin
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Electrician
My Master electrician uses 4/0 alum to sub panel that use to be main panel in house. We place t switch outside and run 3 4/0 alum 2 hot 1 neutral. Then he runs a 6awg copper ground wire to the subpanel which was main panel. Then he separates the neutrals and ground in sub panel (which was main panel). Code say we need to run #4 copper for ground. Please help
 
Are you asking about the GEC (Grounding Electrode Conductor), or EGC (Equipment Grounding Conductor)? If GEC, table 250.66 would indicate a #4, but if you read section 250.66(A) if these conditions are applicable a #6 is acceptable.

Added: if you are referring to the EGC, section 250.122 applies and table 250.122 has for starting point @200 amp requirements for a minimum of a #6 EGC.
So by these references it would seem the installation is compliant.
 
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Fred B said:
Are you asking about the GEC (Grounding Electrode Conductor), or EGC (Equipment Grounding Conductor)? If GEC, table 250.66 would indicate a #4, but if you read section 250.66(A) if these conditions are applicable a #6 is acceptable.

Added: if you are referring to the EGC, section 250.122 applies and table 250.122 has for starting point @200 amp requirements for a minimum of a #6 EGC.
So by these references it would seem the installation is compliant.
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thanks...there is so much to learn
 
jeramiepluemer said:
nobody in my area will teach me. they are afraid i will take some of there work. i am committed to getting my masters
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Nothing stops you from getting a copy of the NEC publication. Learn it. Learn how it is laid out. FIRMS Fast Finder is another source publication to help find code references via an expanded index of codes. Another very good source of getting education Materials is from Mike Holts
www.mikeholt.com

Mike Holt Enterprises - the leader in electrical training.

Mike Holt's electrical training products help people pass exams the first time, learn the NEC easily, and take their careers to the next level. See how we can help you.
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