George

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Bob - Your giving good design advice but as an inspector, I can't enforce it

Thanks, however I do believe it is enforceable.

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250.122 Size of Equipment Grounding Conductors.
(A) General. Copper, aluminum, or copper-clad aluminum equipment grounding conductors of the wire type shall not be smaller than shown in Table 250.122 but shall not be required to be larger than the circuit conductors supplying the equipment. .....

And

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250.122(B) Increased in Size. Where ungrounded conductors are increased in size, equipment grounding conductors, where installed, shall be increased in size proportionately according to circular mil area of the ungrounded conductors.

Personally I do not see any doubt that if you install a grounding conductor it must comply with 250.122(B). [Linked Image]

JMO, Bob

Bob Badger
Construction & Maintenance Electrician
Massachusetts