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Thread: outdoor to indoor wiring question.

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  1. #1

    Default outdoor to indoor wiring question.

    I have mounted an outdoor box on an exterior wall and have drilled a hole for a conduit nipple to go through the wall. Can I put Romex through that hole and continue the Romex to the nearest electrical box inside? The wire would be coming stright through the nipple and then immediately by stapled to the nearest studs on the way to the electrical source. Thanks.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    The nipple will create a "sharp edge" and the Romex® will not be anchored so it could rub against the raw edge. Use a shorter nipple, then a threaded coupling, and a wire clamp/connector into it. Slide the wire through it and tighten the clamp screws.
    Licensed residential and commercial plumber

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    DIY Senior Member Homeownerinburb's Avatar
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    HJ is right, but:

    There are two considerations when wire enters a box, generally speaking.

    Abrasion must be avoided. On MC there are little red plastic anti-short bushings. For MC (the stuff you are asking about) there are rated plastic and metal devices that will fit the box and protect the sheathing from abrasion. There must be a dozen different concepts on the market.

    The other issue when any wire or cable comes into a box is that it cannot be pulled back out. For MC the various devices that prevent abrasion also clamp the cable.

    Some of the plastic boxes on the market have no provision to hold the wire from being pulled out, and when used it is expected that the wire be stapled to the framing within 8".

    There are anti-short bushings (collars) that screw over the threads of rigid conduit and present the wires or cable with a much smoother surface to work against.

    All that said, I could imagine replacing the metal conduit that you have with some plastic, and stapling the wire down if you can get at it. Or use a plastic nipple for the second box (the source) that has a good grab on the wire.

    Make sure that you have enough room in the source box,

    Remember: the sheathing must be visible in the box. 1/4 to 1/2 inch is expected.

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    Test, Don't Guess! cacher_chick's Avatar
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    If the nipple is EMT conduit, there is a standard EMT to NM (Romex®) fitting which clamps the NM cable and circumvents the need to use bushings. They are not uncommon, as I get them from the local big-box store.

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    Electrical Contractor/Instructor jwelectric's Avatar
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    Quote Originally Posted by Homeownerinburb View Post
    HJ is right, but:

    There are two considerations when wire enters a box, generally speaking.

    Abrasion must be avoided. On MC there are little red plastic anti-short bushings. For MC (the stuff you are asking about) there are rated plastic and metal devices that will fit the box and protect the sheathing from abrasion. There must be a dozen different concepts on the market.
    First the original poster is talking about Non-Metallic cable not Metal-Clad cable

    Second there is not requirement to use the anti-short bushing for MC. They are required for Armored Cable or AC cable
    See 320.40 and 330.40

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    Licensed Electrical Contractor Speedy Petey's Avatar
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    WHY the nipple at all?? Just bring the NM into the back of the box. Make sure to seal around the box really well.

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    DIY Senior Member Homeownerinburb's Avatar
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    Quote Originally Posted by jwelectric View Post
    First the original poster is talking about Non-Metallic cable not Metal-Clad cable

    Second there is not requirement to use the anti-short bushing for MC. They are required for Armored Cable or AC cable
    See 320.40 and 330.40
    No "requirement", but personally, I would not skip them. And the fact that there is always a bag of bushings with the stuff when I buy it suggests to me that I am not alone.

    I brought up the MC in order that the OP would understand that each system has its requirements; I could have been more verbose, but my post was pretty long as it stood.

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