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Discussion Starter · #1 · (Edited)
Just out of curiosity, we had some boxes installed in concrete for receptacles in a mechanical room 48" to the bottom. Fed from the panel to the bottom of the box and out the top into a drop ceiling. Now the plugs were deleted and an ac was added. The pipes in the deck are big enough to feed the ac at the box in question.

Is it legal to put a metal blank with a chase nipple and locknut on the box then mount a disconnect with another locknut on the chase nipple? (Supported with tapcons on the concrete wall.)

The ac unit is a top fed unit. The issue I'm unsure of is, covering the box with a disconnect and line/load conductors sharing a chase nipple.
 

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ET rocks
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Why not use a box extension with KO's and blank cover, and mount disco next to it.
 

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Discussion Starter · #5 ·
Was trying to make it look clean. The GC doesn't want a lot of exposed pipe, though this box is getting deleted I was going to accommodate. Also the box has a single gang mud ring on it.

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Just out of curiosity, we had some boxes installed in concrete for receptacles in a mechanical room 48" to the bottom. Fed from the panel to the bottom of the box and out the top into a drop ceiling. Now the plugs were deleted and an ac was added. The pipes in the deck are big enough to feed the ac at the box in question.

Is it legal to put a metal blank with a chase nipple and locknut on the box then mount a disconnect with another locknut on the chase nipple? (Supported with tapcons on the concrete wall.)

The ac unit is a top fed unit. The issue I'm unsure of is, covering the box with a disconnect and line/load conductors sharing a chase nipple.
As long as everything is wrench tight you're good to go.
 

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Discussion Starter · #7 ·
OK, I've been researching it. Just wasn't sure if I was missing anything.

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ET rocks
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So your leads are long enough and no splices in box?

Seems to me like you would still have at least an equipment ground splice inside the buried box.

In 5 years, the next troubleshoot might call you a hack, but i guess you could blame it on the GC.

GC's need to pay up to do it right.

i would cut the shallow concrete around the 4S and extend it to blank it and mount the switch next to it with short nipple.

Sorry, just can't stand GC's right now.:laughing:
 

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Discussion Starter · #9 ·
It's pvc pipe to a metal box, with a ground tail or a bond bushing, using metal cover chase etc, I could ground the box inside the disconnect to the ground bar.

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Estwing magic
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Why not use a box extension with KO's and blank cover, and mount disco next to it.
That's the right way to do it. Leave your JB exposed. Too bad if the GC doesn't think it's pretty.

If you put the disconnect over the JB and the inspector doesn't like it, how much room do you have to argue? Then you have to take it apart and do it over again.
 

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Why put a blank cover on it?

Just mount the disco over it with a chase nipple to protect the wires. Obviously leave the wires long enough to hit the disco so there are no splices in the jb.. If you need to access the box, it's only 4 screws.

And use screws instead of tapcons so someone can remove it if necessary!!
 

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220/221 said:
Why put a blank cover on it?

Just mount the disco over it with a chase nipple to protect the wires. Obviously leave the wires long enough to hit the disco so there are no splices in the jb.. If you need to access the box, it's only 4 screws.

And use screws instead of tapcons so someone can remove it if necessary!!
I agree. That's how I would do it. As long as you bond the box to the disconnect.
 

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Discussion Starter · #14 · (Edited)
The tapcons can be removed, it's on a block wall. I could use plastic anchors I suppose. Just trying to work with material I have. I just think it would look better to cover the box. Though I don't want to do anything illegal. I was seeing if anyone had any code saying I couldn't. I'll definitely ask the inspector good thoughts before anything is completed.
 

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Cover the box. I've done tons of precast jobs from the ground up and this is the way it's done even if you know the disconnect is needed
 

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I've done this before without the plate. I drill two holes and directly screw disconnect to 6/32 box yokes. The screws also complete a grounding path back to the box .

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