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Old 05-07-2011, 07:03 PM   #1
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Code History -- Reduced size ground conductors okay


I know that currently grounding conductors in NM cables (Romex) need to be the same size as the current carrying conductors. I also have seen older wiring where the ground is sized smaller. This was common in the 1960's. Does anyone know when the code was changed?

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Old 05-08-2011, 04:14 AM   #2
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Code History -- Reduced size ground conductors okay


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Originally Posted by Perry401 View Post
I know that currentlly grounding conductors in NM cables (Romex) need to be the same size as the current carrying conductors. I also have seen older wiring where the ground is sized smaller. This was common in the 1960's. Does anyone know when the code was changed?
I think it was in 1973 or little before that I may check with one guy he know the history on that so I may ask him for backtrack a littel to see how far it was but IIRC it was about the same time the older Alum branch conductors were no longer legit { old #12 , #10 AWG AL only }

Merci,
Marc

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Old 05-08-2011, 04:43 AM   #3
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Code History -- Reduced size ground conductors okay


In 1977 I was building a cottage in western Mass. NM cable with the smaller ground was still being used. Common practice was to wrap the ground back along the cable sheath and secure with the clamp of the metal box.

Al cable was also being used for small branch circuits, I passed on that.
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Old 05-08-2011, 07:49 AM   #4
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Code History -- Reduced size ground conductors okay


Joe Tedesco would know!
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Old 05-08-2011, 09:28 AM   #5
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Code History -- Reduced size ground conductors okay


Ahhh the wrapping of the ground. I've heard it called the Boston back wrap but I'm not sure where it originated.
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Old 05-08-2011, 09:36 AM   #6
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Code History -- Reduced size ground conductors okay


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Ahhh the wrapping of the ground. I've heard it called the Boston back wrap but I'm not sure where it originated.
Brings back memories but that is what it was called:

http://www.contractortalk.com/f32/bo...ck-wrap-16273/

Don't replay to the thread on ContractorTalk - it is old.

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