Garage & Exterior wiring questions

Discussion in 'Electrical Forum discussion & Blog' started by dgold, Nov 9, 2007.

  1. dgold

    dgold Product R&D

    Joined:
    Dec 6, 2006
    Occupation:
    Product R&D - Swimming Pool Industry
    Location:
    Carlsbad, CA
    When installing an exterior outlet on my home I need to pass the wire through brick. When installing an additional circuit to my garage, I need to pass wire through block.

    What is the preferred way to do this? Can I just drill a hole and feed interior 14 gauge Romex through the hole? Or do I need to use UF, MC, or conduit? In no case will there be any direct sunlight exposure as I plan to mount the exterior box directly to the wall and feed the wire through a hole in the back side of the box.

    Also, is there any rule regarding the size of the hole? To my garage for instance, I want to run 3-conductor wire through block, in order to add two 110v 20A circuits (one off the black, one off the red). I plan to split them in a junction box to get one circuit down each side of my garage. Then I plan to use a 20A GFCI outlet as the first outlet on each side, immediately after the split, to get GFCI protection throughout -- since as I understand it, I cannot use GFCI breakers with a shared neutral or ground wire.

    Any help is appreciated.
    Thanks.
     
  2. Mikey

    Mikey Aspiring Old Fart, EE, computer & networking geek

    Joined:
    Nov 8, 2005
    Occupation:
    Consumer
    Location:
    Central Florida
    In Florida, I use NM conduit when going through brick or block, mostly to keep the critters out of the boxes. Drill a hole for the conduit, stick a male adapter in the outside box, use plenty of caulk, and fasten the box to the outside wall (Tapcons work well). Put a male adapter in the inside box, cement in a piece of conduit of the proper length, caulk again, put cement on the end of the conduit, push it thru the hole to join up with the outside, and secure the box to the inside wall. Makes a nice clean installation.

    Obviously, the size of the hole is determined by the size of the OD of the male adapters (1 1/8" for 1/2" NM, 1 3/8" for 3/4"). I personally don't like sharing the neutral at all. Using 2 GFCI receptacles is cheaper than a single GFCI breaker, I'm pretty sure.
     
    Last edited: Nov 9, 2007
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. dgold

    dgold Product R&D

    Joined:
    Dec 6, 2006
    Occupation:
    Product R&D - Swimming Pool Industry
    Location:
    Carlsbad, CA
    I've never used the nm conduit before, but sounds a lot like working w/ plastic plumbing pipe. Thanks for the advice.
     
  5. Speedy Petey

    Speedy Petey Licensed Electrical Contractor

    Joined:
    Jun 16, 2007
    Occupation:
    Licensed Electrical Contractor
    Location:
    NY State, USA
    Even easier. No cleaner required.
     
Similar Threads: Garage Exterior
Forum Title Date
Electrical Forum discussion & Blog Garage electrical outlets & appliances (water softener, etc) Tuesday at 8:17 AM
Electrical Forum discussion & Blog Yet Another Garage Subpanel DIscussion Jun 20, 2014
Electrical Forum discussion & Blog Exposed NM-B in Garage... What year not legal? Jan 17, 2013
Electrical Forum discussion & Blog Looking for some help on garage sub panel Aug 31, 2012
Electrical Forum discussion & Blog Subpanel in attached garage adjacent to living space May 3, 2012

Share This Page