Transitioning Flex from in-wall to exterior panel

[Solar_ice_caps]

Running a circuit in a detached garage (exposed truss) and am looking for some guidance on fittings.

My current plan is to run (3/4” needed) Flex along trusses, down the inside of the wall (behind sheetrock) and then bend and terminate inside the exterior surface-mount panel with a flex screw-in connector.

My concern is that I should not/can’t bend the conduit that tightly within the confines of the framing (3.5”). Conversely, I could put a 90 connector on the end but I don’t think it would have enough length to terminate through the exterior wall into the panel.

 

[Todd0x1]

I'd come out of the bottom of the panel and into the wall with an LB. Cut in a double gang old work box behind where the LB enters the ext wall. Nipple between the LB and the old work box. Drop your flex down into the top of the old work box.

If you penetrate the ext wall behind the surface mount panel, you don't really have any way to seal your penetration on the outside of the wall.

 

[Solar_ice_caps]

I'd come out of the bottom of the panel and into the wall with an LB. Cut in a double gang old work box behind where the LB enters the ext wall. Nipple between the LB and the old work box. Drop your flex down into the top of the old work box.

If you penetrate the ext wall behind the surface mount panel, you don't really have any way to seal your penetration on the outside of the wall.

Good idea. I was trying to avoid cutting up the drywall and my alternative there was to go all the way through and mount a box on the interior wall

 

[Todd0x1]

Good idea. I was trying to avoid cutting up the drywall and my alternative there was to go all the way through and mount a box on the interior wall

Forgot to add, in my method you obviously need perfect alignment for the nipple between the back of the LB and the KO in the box. Drill from outside in with a long SDS or masonry bit, 1/4" and go all the way through the interior wall. Then punch the ko in the back of your box and center it over your pilot hole. Now trace the box for your cutout. Then go back with your hole saw using the pilot hole you just made and make the hole for the LB/nipple.

 

[LarryFine]

If you penetrate the ext wall behind the surface mount panel, you don't really have any way to seal your penetration on the outside of the wall.

I usually apply a thick ring of caulk around the hole in the wall, the KO, or both if the gap is large enough.