[ArknSpark]

I have about 30 rigid conduits stubbed up through a slap on an electrical room wall, they will provide raceways for branch circuits from 3 seperate normal power 120/208 3 phase panels.

I am going to mount a 6x6x72" hoffman box over these conduits and then run 1 2 1/2" up to each panel.

Since some conduits vary from one another from finish floor 3" to 3 1/2" to the top, (damn concrete guys lol) I figured it would be easier just to spin on rigid couplings and use chase nipples into them through the box, killing two birds with one stone by using 1 rigid coupling and 1 chase nipple vs. 2 rigid locknuts and one plastic bushing per pipe.

Is this legal? Grounding is my concern, its under 250volts and I will be drilling my own holes into the wireway.

 

[backstay]

I have about 30 rigid conduits stubbed up through a slap on an electrical room wall, they will provide raceways for branch circuits from 3 seperate normal power 120/208 3 phase panels. I am going to mount a 6x6x72" hoffman box over these conduits and then run 1 2 1/2" up to each panel. Since some conduits vary from one another from finish floor 3" to 3 1/2" to the top, (damn concrete guys lol) I figured it would be easier just to spin on rigid couplings and use chase nipples into them through the box, killing two birds with one stone by using 1 rigid coupling and 1 chase nipple vs. 2 rigid locknuts and one plastic bushing per pipe. Is this legal? Grounding is my concern, its under 250volts and I will be drilling my own holes into the wireway.

A chase nipple into a coupling will not be an effective ground. I'd make my own nipples to what ever length was needed.

 

[ponyboy]

A chase nipple into a coupling will not be an effective ground. I'd make my own nipples to what ever length was needed.

X2. Dust off the nipple chuck and get threading.

 

[ArknSpark]

Maybe I could thread a locknut onto the chase nipple then insert the chase nipple through the the enclosure and into the coupling? All conduits will have grounds pulled through them by the way, I should of said bonding was my concern.

 

[Bkessler]

I've done that a few times. When I get some slobs mismatched stub ups. I think it works great.


When's lunch?

 

[ponyboy]

Are they on deep strut off the wall? Maybe you could cut them all even and hand thread them in place.

 

[360max]

a chase nipple into a coupling will not be an effective ground. i'd make my own nipples to what ever length was needed.

x2. dust off the nipple chuck and get threading.

...x3 ...

 

[Mich drew]

Cut them all even and use set screw rigid connectors.

 

[ArknSpark]

they are set 7/8" off the wall, mounted to strut below the slab. When they backfilled for gravel before the pour they must have dumped a whole bobcat bucket on the pipes. Worst case I buy 2" threaded nipples and cheat the short ones a 1/4" on each side. Just wanted to avoid it becasue it wouldnt look as professional.

 

[ArknSpark]

Cut them all even and use set screw rigid connectors.

Spec book says no lol

 

[Jlarson]

We do that all the time. On a painted can scratch the paint first.

Manufacturers sell chase nipples for this exact app.

I also use 2 chases and a couple to go between starters and control cans to a wire way.

 

[backstay]

X2. Dust off the nipple chuck and get threading.

I have one and it gets a lot of use.

 

[ponyboy]

I have one and it gets a lot of use.

I'll go weeks without using it and then I'll need it a dozen times in a day

 

[ponyboy]

We do that all the time. On a painted can scratch the paint first. Manufacturers sell chase nipples for this exact app. I also use 2 chases and a couple to go between starters and control cans to a wire way.

I've done that with panelboard tubs. Chase, coupling, chase.

 

[stuiec]

I've done that with panelboard tubs. Chase, coupling, chase.

I don't know why, but when you say it, it just sounds dirty.

 

[wildleg]

cplg+chase, cplg+close+locknut, whatever floats your boat

 

[Southeast Power]

I have about 30 rigid conduits stubbed up through a slap on an electrical room wall, they will provide raceways for branch circuits from 3 seperate normal power 120/208 3 phase panels.

I am going to mount a 6x6x72" hoffman box over these conduits and then run 1 2 1/2" up to each panel.

Since some conduits vary from one another from finish floor 3" to 3 1/2" to the top, (damn concrete guys lol) I figured it would be easier just to spin on rigid couplings and use chase nipples into them through the box, killing two birds with one stone by using 1 rigid coupling and 1 chase nipple vs. 2 rigid locknuts and one plastic bushing per pipe.

Is this legal? Grounding is my concern, its under 250volts and I will be drilling my own holes into the wireway.

Sounds like a nice wire friendly way to do it.
30 stub ups?
I would go at least 8x8 on that gutter, maybe even 12x12, you won't regret it if you have room for it. The next guy will be even happier.

 

[ponyboy]

Sounds like a nice wire friendly way to do it. 30 stub ups? I would go at least 8x8 on that gutter, maybe even 12x12, you won't regret it if you have room for it. The next guy will be even happier.

8" deep gutter is clown shoes, 12" is simply absurd. Unless you're piping into with 4" there's no need for all that extra metal

 

[ArknSpark]

Sounds like a nice wire friendly way to do it.
30 stub ups?
I would go at least 8x8 on that gutter, maybe even 12x12, you won't regret it if you have room for it. The next guy will be even happier.

The electrical panels are 6" deep, I wanted the wire way to finish the same from the wall :thumbup:

 

[ponyboy]

The electrical panels are 6" deep, I wanted the wire way to finish the same from the wall :thumbup:

Exactly