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Old 10-17-2016, 09:53 PM   #1
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NM from interior wall direct to exterior WP.


Hello everyone,

Hope I'm able to explain my question correctly.

I got some input from an electrician who is assisting.

We need 10/3, 220v, 20amp circuit in a junction box mounted on a brick exterior wall.

The NM 10/3 has been run down the interior wall and now needs to be ran through the brick exterior wall.

My question: Best method. These options were provided.

1: Could 90* gray 3/4" pvc be used in the wall to bring the cable out directly to the back of the box?
●Pvc pipe with male adapter connects to the back waterproof box.

2: Should a metal box be install inside the home, gray 3/4" pvc in back of it. Pvc pipe connects to the back of the outside metal waterproof box?
●Cable runs in the top of interior box, secured with clamp.
●Short pvc pipe has male adapter that connects to inside and outside boxes.

3: Run NM cable through the wall, no conduit, directly into the back of the exterior box. NM cable secured using romex clamp on junction box?
● Cable stapled to interior studs. Once cable is ran through the wall, clamped to connector in back of box , fill void with silicone. Run a bead of silicone to top and sides of box.

Thanks in advance.

Joe

Last edited by xjfan; 10-17-2016 at 10:03 PM.
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Old 10-17-2016, 09:59 PM   #2
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Re: NM from interior wall direct to exterior WP.


Option 1 is what i do.
Why 10/3 for the 20 amp circuit?
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Old 10-17-2016, 10:04 PM   #3
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Re: NM from interior wall direct to exterior WP.


1: Could 90* gray 3/4" pvc be used in the wall to bring the cable out directly to the back of the box?
●Pvc pipe with male adapter connects to the back waterproof box.


Yes, you can do that. Its more than what's needed......no need for PVC pipe in the wall.

2: Should a metal box be install inside the home, gray 3/4" pvc in back of it. Pvc pipe connects to the back of the outside metal waterproof box?
●Cable runs in the top of interior box, secured with clamp.
●Short pvc pipe has male adapter that connects to inside and outside boxes.


No need for a metal box on the inside. That interior box would require accessibility in the future, which could complicate your future interior plans. No need for it.

3: Run NM cable through the wall, no conduit, directly into the back of the exterior box. NM cable secured using romex clamp on junction box?
● Cable stapled to interior studs. Once cable is ran through the wall, clamped to connector in back of box , fill void with silicone. Run a bead of silicone to top and sides of box.

Yes, in my opinion, this is your best option.

NOTE: If this is for an AC condenser, you'll need a manual disconnect on the outside instead of a junction box.

Hope this helps.

Last edited by Power-; 10-17-2016 at 10:08 PM. Reason: Missing text
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Old 10-17-2016, 10:24 PM   #4
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Re: NM from interior wall direct to exterior WP.


It's a sewer grinder pump. Distance from electrical panel to pump control panel is approx 125'. We thought it'll be safer to run 10/3 instead of 12/3.
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Last edited by xjfan; 10-17-2016 at 10:32 PM. Reason: added text
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Old 10-17-2016, 10:38 PM   #5
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Re: NM from interior wall direct to exterior WP box.


I was reading on various sites. Some indicates nm needs to be protected because a small amount us exposed.

Others indicate, just run the cable through the wall directly to the back of the box.

I wasn't sure which way was best.

Plumbing part will be inspected, not sure about electrical. I'll follow up with plumber to confirm.

Last edited by xjfan; 10-17-2016 at 10:43 PM.
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Old 10-17-2016, 10:44 PM   #6
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Re: NM from interior wall direct to exterior WP.


In the commercial industry, we call those ejection pumps.

You may want to run another low voltage cable with your 10/3 out to the pump. REASON: Some customers want hi-level audible alarms to inform owners the tank is too full. Black water waste tanks have floats that control the ON/OFF of the pump, but also have a hi-level alarm float that is used for warning about a pending overflow.
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Old 10-17-2016, 10:52 PM   #7
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Re: NM from interior wall direct to back of exterior WP box...


Good idea. I know the panel has alarm and light. I'll look into running low voltage also. Might as well. Wall has been opened up. Thanks.
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