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Old 03-03-2011, 01:21 AM   #16
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Ground wire connections in metal junction box.


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Originally Posted by J. V. View Post
250.148 Continuity and Attachment of Equipment
Grounding Conductors to Boxes.


(C) Metal Boxes. A connection shall be made between the
one or more equipment grounding conductors and a metal
box by means of a grounding screw that shall be used for
no other purpose,
equipment listed for grounding, or a
listed grounding device.

I am of the opinion the screw does have to be green, since all the ground screws that are listed for the purpose are green.
Any 10/32 machine screw the way I see it would be a violation.
Not quite but with standard machine screw as long you have at least two threads in the box you are allright but JAMAIS { NEVER } use the self tappers the thread is way too course unless you have self tapping machine screws.

I know majtory of the inspector are used to see the green grounding screw but few case some don't I know few Canadian boxes I have see they are not green unless you got the modern one which I did see it few time when I was living in Québec for while.

Merci.
Marc

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Old 03-03-2011, 12:13 PM   #17
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Ground wire connections in metal junction box.


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Originally Posted by frenchelectrican View Post
Not quite but with standard machine screw as long you have at least two threads in the box you are allright but JAMAIS { NEVER } use the self tappers the thread is way too course unless you have self tapping machine screws.

I know majtory of the inspector are used to see the green grounding screw but few case some don't I know few Canadian boxes I have see they are not green unless you got the modern one which I did see it few time when I was living in Québec for while.

Merci.
Marc
The screw must be listed for the purpose. The only screws I know of that are rated for this purpose are green.
So, I must disagree with you on the color and agree it must engage at least two threads in addition to being green in color.

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