Junction boxes without ground bump

[bluedog225]

I ended up with a bunch of steel city junction boxes without ground bumps. I’m going to mount them on a concrete wall. Are grounding clips the way to go or should I drill and tap? Or it doesn’t matter?

Thanks

 

[mm08822]

Recycle all ground clips........they ****.

The smaller hole in the back of the box may already be threaded unless they are super old.
You could tap them all before installing just to get it done.
May want a pilot hole on the wall behind screw hole for screw clearance so you aren't fighting with the screw/concrete.

 

[Chuckster in NJ]

Ground clips meet the code and you can use them but they ****…….. Just drill a 1/4”x1/4” deep hole in the wall to accommodate the ground screw where it pokes through the box.

BTW! I have never seen a junction box without a threaded ground screw hole.

 

[bluedog225]

Ground clips meet the code and you can use them but they ****…….. Just drill a 1/4”x1/4” deep hole in the wall to accommodate the ground screw where it pokes through the box.

BTW! I have never seen a junction box without a threaded ground screw hole.

Ok. No ground clips. Good to know.

They all have threaded holes. I was just trying to figure out whether it was easier to tap a new hole in the side. Though a 1/4” hole in the wall wouldn’t be a big deal. There are only 16 boxes I need to do.

Thanks

 

[sparky 1971]

If everything is in EMT back to the panel and raised covers with crushed corners are used, get self grounding devices and forget the ground altogether. Just make sure all of the fittings are tight.

 

[mm08822]

BTW! I have never seen a junction box without a threaded ground screw hole.

Now you have.

 

[JohnX14]

I've seen plenty without a threaded ground screw, just not many that have been made in the last 50 years.

 

[JohnX14]

I'd drill a 1/4" hole as others suggested for the ground screw. Nothing wrong with using the emt as a ground, but I'd run a grounding conductor.

 

[Chuckster in NJ]

Now you have.

I assumed the OP was referring to modern equipment.

Well preserved example of a 1950’s ceiling box when they didn’t use ground wires.…….. I saw these used in post war homes where they used 2 wire Romex with that "silver cloth like" jacket OR where they used BX.
Grounding of boxes became "code" in 1962.

WARNING! Make sure you are up to date with your tetanus shot before you handle this rusty antique box that came out of a Newark, NJ demo site.

 

[mm08822]

I assumed the OP was referring to modern equipment.

Well preserved example of a 1950’s ceiling box when they didn’t use ground wires.…….. I saw these used in post war homes where they used 2 wire Romex with that "silver cloth like" jacket OR where they used BX.
Grounding of boxes became "code" in 1962.

WARNING! Make sure you are up to date with your tetanus shot before you handle this rusty antique box that came out of a Newark, NJ demo site.

Never used. This is NOS for certain.

Was purchased post '54 by my dad for his new (then) house to finish the basement. All bx in house, snap switches, 2-prong recepts, porcelain lamp holders, Wadsworth split-buss 60A fuse panel.

I never used it b/c I was too lazy to notch the joists so the rock sat flat.

 

[bluedog225]

Funny, you should say that, some of the stuff I’m trying to use came out of my dad‘s old ham shack store room. I hate to waste stuff.

 

[35Ford]

I agree with the others, skip the ground clips. A 1/4" hole in the block is probably the best option. In a pinch, put a 10/32 nut on the ground screw before you thread it into the box. With the nut and a ground wire under it, the ground screw will barely protrude past the back of the box.

 

[bluedog225]

I agree with the others, skip the ground clips. A 1/4" hole in the block is probably the best option. In a pinch, put a 10/32 nut on the ground screw before you thread it into the box. With the nut and a ground wire under it, the ground screw will barely protrude past the back of the box.

Got it. Lots of good options. I‘m guessing a little bolt and nut through the side is also acceptable. I could crank those out pretty quick.

 

[sparky 1971]

Got it. Lots of good options. I‘m guessing a little bolt and nut through the side is also acceptable. I could crank those out pretty quick.

It's supposed to be a threaded hole with two threads in contact with the box.

 

[dscheidt]

Give them to someone running EMT who doesn't have to worry about grounding them with a wire.