Preferred Method for feeder wires to Main panel

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nojohnny101

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Location
North Carolina
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IT
First time poster on here. I have found the posts on here incredibly helpful so I thought I would ask a question regarding my current project to get feedback as I couldn't find much for searching.

the project: electrical sub panel for a shed. plan to have a 100amp subpanel being fed from a 200amp main panel in my garage.

I am running AL 2-2-2-4 about 350' feet through 2" gray conduit buried at minimum 18" deep. I already have the trench dug, conduit laid, but haven't pulled yet. That's because I'm trying to make sure I have a plan for the end connections.

My question: I have the 90 degree stubbed up out of the ground on the side of my house. What is the best way to go through the outside of my house to my main panel? The wall is an exterior one that is not insulated and is the garage. I have located the panel's location on the inside (inside the garage) and outside of the wall (exterior of the house).

I have read about two methods:
  • punch through the back of the main panel from the outside and connect (not ideal from I can see from my research)
  • punch through the wall and then go up into the main panel from within the wall (I think this is preferred method).
    • some questions if this is indeed the route that I should go:
      • at what height should I go up the house before punching in?
      • does someone have some guides for creating a clean hole (just a hole saw bit?) for the LB conduit box I have?
      • does this mean I have to remove some drywall from side to help feed the wire up?
      • once inside wall and going up to the main panel from the bottom, does it need to be in any more conduit?

thanks everyone for the help!
 
Yes it needs to be in conduit the whole way, unless you transition to a cable type wiring method. I would probably come right into the back of the panel from outside with an LB. Take the appropriate KO out of the back of the panel, or drill your own hole with a 2-3/8 hole saw. DONT drill all the way thru the siding, but go just far enough until the pilot pokes thru. Now go from the outside with the appropriate size HS that matches the nose of the LB and a TA. Sometimes you need to get creative depending on the spacing. You can use a box adapter directly into the nose of the LB if you dont have enough room for a TA. You can strap the PVC to strut too, which buys you more real estate for a TA if needed.
 
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