Mounting A Box To Uni-Strut.....

[Seven-Delta-FortyOne]

I have a steel building that I need to mount about 60 receptacle boxes on the ceiling. (Don't ask )

I'm going to use beam clamps or bolts, haven't decided yet, to hang rows of Uni-Strut.

I'm having trouble finding a single gang receptacle box that mounts to Uni-Strut.

So I'm looking at a 4Sq with a bracket. I can't remember if the holes are big enough to use spring nuts?

Electrical wholesaler is closed, I'll call them in the morning. Just wondering if you guys have a good solution for this.

I see they make a channel cover for Uni-Strut, but I doubt that was designed for drilling into to install boxes.

Thanks

 

[480sparky]

I just smack the center KO of the box out and use a fender washer and bolt to run through to a strut nut.

 

[Hv&Lv]

Link won’t work right...

 

[tom baker]

Agree use KO and fender. If you mount the boxes on a long run of strut, there are clamps you can use so don't have bend kicks.
Caddy should have some

 

[jimport]

A 1/4x20 bolt fits through the holes in a 1900. Just need a strut nut.

 

[480sparky]

A 1/4x20 bolt fits through the holes in a 1900. Just need a strut nut.

Then the conduit won't line up with the KOs on the side of the box if you strut straps.

 

[infinity]

A 1/4x20 bolt fits through the holes in a 1900. Just need a strut nut.

I agree, two 1/4" bolts with "square nuts". Two bolts in the 1/4" holes will ensure that the boxes line up.

 

[jusme123]

Agree with using quarter inch holes with 1/4-20 bolts and kindolf nuts

 

[Greentagger]

Mineralac straps( stand off straps) with bolt and fender washer will line up with box ko’s. Handy boxes or 4 square with single gang rolled edge covers.

 

[jusme123]

 

[Seven-Delta-FortyOne]

Then the conduit won't line up with the KOs on the side of the box if you strut straps.

If you use the middle KO, it should line up without a kick, right?

 

[480sparky]

If you use the middle KO, it should line up without a kick, right?

Yuuup!

 

[Bluegrass Boy]

These were on GraybaR site. Says snap in, but oh my , the price?!

 

[Seven-Delta-FortyOne]

Yea I saw those.

Platt has them for 130 something. apiece. If you call and check availability first.

 

[Bluegrass Boy]

Yea I saw those.

Platt has them for 130 something. apiece. If you call and check availability first.

Wow! At that price they should have all of their first shipment they got, still available.

 

[LarryFine]

Then the conduit won't line up with the KOs on the side of the box if you strut straps.

Only in one direction; just turn the box 90 degrees.

 

[winnie]

If you use the middle KO, it should line up without a kick, right?

If you bolt the box to the strut then none of the conduit will be flush with the strut, so to use the straps that hold the conduit to the strut you would need a kick.

I think this is what post 9 is about, using standoff mounting for the conduit straps.

The crazy expensive boxes made for strut open up another option: using the strut itself as the raceway. You need solid strut, a cover for the open side, and various other special fittings. And if you think those snap in receptacles were expensive......I saw this used as surface mount raceway in a residence where industrial was the design aesthetic, and it looked nice....

Jon

 

[SSDriver]

I bolt the boxes to the strut with a fender washer and put one of those square strut washers behind the box. It spaces it of enough that you don't need a kick if your strap is a mini.

 

[lordofthisworld]

I have a steel building that I need to mount about 60 receptacle boxes on the ceiling. (Don't ask )

I'm going to use beam clamps or bolts, haven't decided yet, to hang rows of Uni-Strut.

I'm having trouble finding a single gang receptacle box that mounts to Uni-Strut.

So I'm looking at a 4Sq with a bracket. I can't remember if the holes are big enough to use spring nuts?

Electrical wholesaler is closed, I'll call them in the morning. Just wondering if you guys have a good solution for this.

I see they make a channel cover for Uni-Strut, but I doubt that was designed for drilling into to install boxes.

Thanks

4" X 2 1/8" square box, 1/4" x 20 bolts with 1/4 spring nuts. duplex mulberry cover

 

[Seven-Delta-FortyOne]

4" X 2 1/8" square box, 1/4" x 20 bolts with 1/4 spring nuts. duplex mulberry cover

Thats what I went with.

Screw holes in a handi box are offset from center, so that makes the conduit not line up.

Easier just to use a 4 square.

Thanks for all the help folks.