12x12 J box-bonding

[wankster]

I've got a 12X12 j box that says on the lid it is grounded by incoming conduit or mc cables. Does this mean I need to use a bonding bushing if the conduit is to be its bonding means? I'm tempted to just drill a hole an use a machine screw with nut and loop the ground wire instead.

Thoughts?

 

[petersonra]

Regular fittings can be used for this purpose, even just a lock nut on either side of the jbox wall.

I have real misgivings about doing it this way, having seen so many loose fittings over the years, but it is code legal.

 

[Dennis Alwon]

I've got a 12X12 j box that says on the lid it is grounded by incoming conduit or mc cables. Does this mean I need to use a bonding bushing if the conduit is to be its bonding means? I'm tempted to just drill a hole an use a machine screw with nut and loop the ground wire instead.

Thoughts?

If you use emt or other metallic raceways then there is no need to ground the box, however if you use mc cable I believe you need to bond the box based on 250.148

 

[raider1]

If you use emt or other metallic raceways then there is no need to ground the box, however if you use mc cable I believe you need to bond the box based on 250.148

I agree, EMT can be used to bond the box but if MC cable is used then the box must be bonded using the EGC within the MC cable and not by the MC cable fitting.

Chris

 

[wankster]

Thanks guys. I will be feeding it with emt and I think I'm gonna go ahead and loop a ground on a nut and bolt just for fun.

 

[Dennis Alwon]

Thanks guys. I will be feeding it with emt and I think I'm gonna go ahead and loop a ground on a nut and bolt just for fun.

I was just looking at 250.148 again and if you splice a ground wire, even if it is in emt, then you need to bond it to the box.

 

[raider1]

I was just looking at 250.148 again and if you splice a ground wire, even if it is in emt, then you need to bond it to the box.

Agreed.

Chris

 

[danickstr]

don't forget to scratch off the paint, inspectors like it when you do that.

 

[infinity]

don't forget to scratch off the paint, inspectors like it when you do that.

Even for EMT?

 

[danickstr]

i was being partially facetious, but I wouldn't put it past an inspector.