Clearances for exterior surface-mount j-box?

13 years ago

Setup: Plain flat concrete wall of residential quad-plex; single drop from pole comes to goose-neck, RIGID conduit down to splitter box, 2 meter boxes to each side of splitter; short RIGID nipple out bottom of each meter to main panel a few inches below--bottom knockouts of main panels are 60" above grade; all of these boxes are surface-mount.

Finally, two or three 1/2" and 3/4" RIGID conduits emerge from bottom of each main panel and run straight down, almost to grade. Panels have a couple unused bottom knockouts...

Would like to surface mount a single-gang j-box (for GFCI recep) below one of the middle panels, BETWEEN existing vertical parallel conduit runs, if clearances allow... otherwise will have to "omega"(?) a conduit horizontally over to a nearby clear space on wall.

SO... what ARE the clearances involved? J-box to panel, j-box to nearby conduit, j-box to ground?

Thanks in advance.

PS: What is the proper name of the "omega" or "passover" conduit fitting, you know, straight-semi-circle-straight, used to intersect or "hop over" existing conduit?

__:--:__ ??

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Comments (2)

stlrocker
13 years ago
if i understand your question correctly, there are no clearance restrictions.

there are no restrictions for clearance from a panel or another conduit to a j-box, or receptacle.

a chase nipple would be acceptable, which puts the box right up against the bottom o the panel. in your case, since it sounds like its outdoors,you probably will need a pipe stub just long enough to give you room to open your in-use cover and thats it.

i dont know of a fitting like the "omega" thing you are talking about, but usually to cross another pipe you use a bend called a three point saddle.
fixizin
Original Author
13 years ago
COOL!... I was thinking as much, given the rather "crowded" NEW installs I'd seen--and knew to be inspected--on larger residential and commercial bldgs.

I've got a 6" RIGID nipple that should be perfect for my app., and keep recep well above ground-splash zone.

"Three-point saddle" YES!... that's what I'm talking about... even though I won't need one... this time... GOOD to know. Hard to find them pre-fab'd. Could perhaps make my own using 2 (Z-shaped) offset nipples.

Thanks again.
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