equipment ground
- Thread starter rbarbrey
- Start date
- Status
electricmanscott
Senior Member
- Location
- Boston, MA
Re: equipment ground
In general the box would be grounded by a metalic raceway or egc but the device would still have to be bonded to the box.
In general the box would be grounded by a metalic raceway or egc but the device would still have to be bonded to the box.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Re: equipment ground
If an equipment grounding conductor is present in a metal box and is spliced or connected to a device within the box, than it must be connected to the box even if the box were fed with a grounded metallic raceway. (This wouldn't apply to an IG conductor). You couldn't feed a metal box with NM cable and simply terminate the ground wire on the device. You would be required to connect the equipment grounding conductor to the box as well as to the device as in 250.146.
See also 250.148
If an equipment grounding conductor is present in a metal box and is spliced or connected to a device within the box, than it must be connected to the box even if the box were fed with a grounded metallic raceway. (This wouldn't apply to an IG conductor). You couldn't feed a metal box with NM cable and simply terminate the ground wire on the device. You would be required to connect the equipment grounding conductor to the box as well as to the device as in 250.146.
See also 250.148
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Re: equipment ground
250-146(A) allows metal-to-metal contact between the device yoke and the box for surface-mounted boxes, and even for cover-mounted devices if the parts are listed for such.
250-146(B) allows for the device-mounting screws to provide the continuity if designed and listed for such, even in flush-mounted (in-wall) boxes.
250-146(A) allows metal-to-metal contact between the device yoke and the box for surface-mounted boxes, and even for cover-mounted devices if the parts are listed for such.
250-146(B) allows for the device-mounting screws to provide the continuity if designed and listed for such, even in flush-mounted (in-wall) boxes.
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