[pdxoregon]

... a threaded hole or stud.

Is there an 'approved' method for doing this. The boxes I have are plenty thick enough but does say adding the hole and threading it break any codes by changing the boxes listing for example.

Or drill a hole for the screw and fasten it to the box first then lugs and a final nut ?

Or have a stud welded on the inside ?

 

[Luke M]

How big is the ground wire? If it's an ordinary 12g, then perhaps a grounding clip?

 

[Arrow3030]

Grounding clip was my first thought too. My second thought was how many old/new boxes I've tapped with a 10-32 without thinking of the boxes UL. Maybe I need to rethink my ways but I use a drill bit that taps a lot. Also, ground clips suck to work with IMO.

 

[pdxoregon]

Will will be #12 or #10. Since this time all the labor is 'free' so going a bit over board.

I never liked using the wireway/conduit as my ground. I'm starting to lean toward having a10-32 stud welded to the boxes I have without pre drilled & tapped ground holes.

But need to find if adding the stud by welding violates any NEC or AHJ codes by "modifying" the boxes.

 

[jbfan]

I never gave it a second thought to tap a 10/32 hole and use a bond jumper.

Other boxes I've used 1/2 20 bolts and lock washers and a ground lug.

 

[Arrow3030]

http://www.walmart.com/ip/21737067?...44193218&wl4=&wl5=pla&wl6=65983106335&veh=sem
Not sure about welding and its efficiency for continuity.
The link is to a similar drill bit I use when I need a bond point.

 

[jbfan]

http://www.walmart.com/ip/21737067?...44193218&wl4=&wl5=pla&wl6=65983106335&veh=sem
Not sure about welding and its efficiency for continuity.
The link is to a similar drill bit I use when I need a bond point.

$9 bucks. A Greenlee set only cost about $20 or so.

Harbor freight is $12.99 for a set.

 

[brric]

I never gave it a second thought to tap a 10/32 hole and use a bond jumper.

Other boxes I've used 1/2 20 bolts and lock washers and a ground lug.

Where do you get 1/2 20 bolts? :surprise:
Or did you mean 1/4 20 by 1/2" long?

 

[Arrow3030]

http://www.walmart.com/ip/21737067?...44193218&wl4=&wl5=pla&wl6=65983106335&veh=sem
Not sure about welding and its efficiency for continuity.
The link is to a similar drill bit I use when I need a bond point.

$9 bucks. A Greenlee set only cost about $20 or so.

Harbor freight is $12.99 for a set.

I use a fancy Greenlee set too. It has a great case. I haven't lost a bit in the five years I've had it. I wanna say it was $30 for 5 different taps and a short extension.

I honestly didn't look at the price and posted the first link that popped up.

 

[jbfan]

Where do you get 1/2 20 bolts? :surprise:
Or did you mean 1/4 20 by 1/2" long?

Thanks. I meant 1/4 20 by whatever length needed to get a nut on the other side.

FFS!

 

[MrElectricianTV]

... a threaded hole or stud.

Is there an 'approved' method for doing this. The boxes I have are plenty thick enough but does say adding the hole and threading it break any codes by changing the boxes listing for example.

Or drill a hole for the screw and fasten it to the box first then lugs and a final nut ?

Or have a stud welded on the inside ?

Are these boxes painted black? If so they would not be UL listed to today's standards anyway. What about clamps? Sometimes you can remove an extra clamp and use that screw hole for a ground connection. G clips are another possibility.

 

[pdxoregon]

Are these boxes painted black? If so they would not be UL listed to today's standards anyway. What about clamps? Sometimes you can remove an extra clamp and use that screw hole for a ground connection. G clips are another possibility.

Hubbell Wiegmann SC series gray painted most with knockouts

 

[MrElectricianTV]

Hubbell Wiegmann SC series gray painted most with knockouts

It's odd that there is no grounding hole already tapped into the enclosure. In the other series of boxes the catalog says that there are grounding provisions. I would contact the factory to see if they have a grounding solution. If you haven't already purchased the boxes, go to an electrical supply company to see what they have available.

http://www.hubbell-wiegmann.com/catalog/sectionA.pdf

 

[pdxoregon]

I have 16 @ 4x6x4, and 4 @ 10x8x4, that cost me a total of $50. Came from a lot of stuff that was from an insurance payoff. It is the 4x6x4 that don't have a grounding provision. The 4 10x8x4's do. I've sent an email to the regional office.