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Thread: Subpanel location, mounting on the joist

  1. #31
    DIY Senior Member Homeownerinburb's Avatar
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    Quote Originally Posted by electrotuko View Post
    Exactly, that was the goal for having an elegant solution. Drill one hole in the floor to get to crawl space from the main panel. Run one 50' cable (easy to mount to each joist) through that hole to subpanel and from here easy split multiple NM-B's to all directions.
    Looks like the subpanel still an option.
    Few last things to clarify:
    It is not required to have a concrete floor in the area subpanel mounted? It is a gravel in the crawl.
    What is required minimum distance from the bottom/center of subpanel to the floor?
    When you get to the end of your questions, and have only those specific to your region, you might want to go ask your local authority.

    Speaking of what CA is asking of us here now: when running NM under the floor in a crawl space, they want for us to install nailers such that nothing can be hung on the cable as it goes from one joist to the next.

    As I understand it, you need to secure the cable every 4' or there abouts. Not to each joist.

  2. #32
    DIY Member electrotuko's Avatar
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    jwelectric, you mentioned:

    you could sit the panel on the ground if you so desired. In order to have the required working space the top of the panel must be below the floor joist.
    But earlier you pointed out to 110.26(A)(1)(2)&(3) and noted:
    and have a head room of at least 6 feet.
    Just to clarify, can the subpanel be mounted 4 feet above the ground? How about the headroom of 6 1/2' you mentioned.
    It would be mounted on your suggested 3/4" ply board, making in the same high of my I eyes when sitting on the floor.

  3. #33
    Electrical Contractor/Instructor jwelectric's Avatar
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    [QUOTE=electrotuko;408266]jwelectric, you mentioned:
    Quote Originally Posted by jwelectric View Post
    you could sit the panel on the ground if you so desired
    Quote Originally Posted by electrotuko View Post
    But earlier you pointed out to 110.26(A)(1)(2)&(3) and noted:
    Quote Originally Posted by electrotuko View Post
    Just to clarify, can the subpanel be mounted 4 feet above the ground? How about the headroom of 6 1/2' you mentioned.
    It would be mounted on your suggested 3/4" ply board, making in the same high of my I eyes when sitting on the floor
    Look closely at 110.26 and you will see that the working space, or the space in which one would be standing while working in the panel is required to be 30 inches wide, 36 inches deep and 78 inches high. This working space is the area in which one will be standing while working in the panel.

    The panel itself can be mounted anywhere between zero inches and 79 inches to the center of the grip of the highest breaker.

    In a dwelling unit I have never in 47 years pulled out a ruler to measure the panel. I mount the panel at a good working height for me.

    If your heart desires to mount the panel so you can sit on a nail keg to work in the panel that is your choice. You can mount it as high as your heart desires as long as the highest breaker in the panel is no higher than 6’ 7” above finish grade.

    You said you have 6 feet of head room under the house so you will need to dig a hole that is at least 30 inches by 36 inches so you can achieve a head room of 6.5 feet. Mount the panel at any height your heart desires as long as it is no higher than the bottom of the floor joist.

    If your heart desires to install hooks so you can hang by your feet to work on this panel then by all means sit it on the ground although in my personal opinion this would be a lot of work for nothing and then you might have a family of Armadillos trying to bite your nose while you are working on that panel.

    By the way have you ever had armadillo stew? Does it really taste just like chicken?

  4. #34
    DIY Member electrotuko's Avatar
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    Thanks!

  5. #35
    DIY Member ImOld's Avatar
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    Quote Originally Posted by electrotuko View Post
    Thanks!
    Interesting thread but............................

    If the OP is in fact in Chicago, you know, the city with it's own electrical code.

    Please don't reply with remarks such as "but it's just the same ".

    It's not.

    Something to ponder.

  6. #36
    DIY Member electrotuko's Avatar
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    The work is in a finishing up stage.
    Just curious if this is acceptable.
    The main panel is installed between studs on the outside wall. Now having added wires coming out to crawl.
    There are approx. 10 wires NM-B going down and 15 up from then panel. I was thinking of putting insulation in the area surrounding panel, between studs, were are the wires. Now worrying if this is OK to cover that whole area with the fiber glass insulation, since many wires over there, can get preheated. Wires not bundled, going in a parallel pattern. Is this Ok to insulation as per NEC?

  7. #37
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by electrotuko View Post
    The work is in a finishing up stage.
    Just curious if this is acceptable.
    The main panel is installed between studs on the outside wall. Now having added wires coming out to crawl.
    There are approx. 10 wires NM-B going down and 15 up from then panel. I was thinking of putting insulation in the area surrounding panel, between studs, were are the wires. Now worrying if this is OK to cover that whole area with the fiber glass insulation, since many wires over there, can get preheated. Wires not bundled, going in a parallel pattern. Is this Ok to insulation as per NEC?

    Can you take pictures ?


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  8. #38
    DIY Member electrotuko's Avatar
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    I can take few pictures, in a few least questionable areas, to void some criticism...

    Just to reiterate my worry:
    Can I cover the area (insulate wall) with fiberglass R-16 below and above the panel where many NM-B wires going up/down from the panel. Afraid to have temp rise or so. Is NEC OK with this?

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