Conduits In A Slab

[Fulthrotl]

I will always put as much as possible under the slab. I try to only put 2 ckts max in each pipe to allow for adds or goofups. I always run 4" to the transformer pad and if possible put in a spare 4" (commercial) and I never use 1/2" under-slab. 3/4 or larger. The only thing that I have learned does not belong under-slab is shielded wire. PVC inevitably will have some water in it and one little nick in a shelided wire can cause all kinds of troubleshooting. I also recommend using rigid 90s to come up out of the slab and I have almost never been allowed to put anything in a slab on deck. One last bit of advise. If you do decide to go underneath don't just put some first year monkeys out there to run it or all the time and money you would have saved will be lost to saw cutting and jack hammering.:happysad:

ah. old school. ;-)

what he said... yep. all of it. especially the 1/2" not being used. ever.

i like yard ells coming out of the pour, saves putting on a nipple.
and every yard ell has a coupling on it, and pull string in it, BEFORE
THE POUR. i'll leave 6 feet of string extra on each end, shove it into
the pipe, and screw a pipe plug in... you can buy the cheap plastic ones
and leave a few inches of string out the pipe, with the plug screwed into
it to anchor it.

i'll put lighting home runs in a tilt up, in the pour strip if i can.

and EVERY yard ell will have written on it what it is, in sharpie.
if possible, i also NUMBER each pipe the same on both ends.
just start serializing them at #1. saves an ungodly amount of time
later.

and i put in extra pipes. always.

and if i come up in a wall with the plumber, and my layout disagrees
with the plumber, i follow the plumber. at least i'll have company, and
they will move a wall a bit for a plumber. they never move walls for sparkys.

not screwing up the underground was the most important thing i learned
in the first two years i worked at this.

i'm currently following behind a contractor, trying to sort their underground
that was put in two years ago.... the customer is not pleased, my labor
is over $5k, this month. we aren't done yet. it's fugly. three 4" pvc, lost
3' deep under concrete, 3/4" and 1" conduits lost in the slab, etc.

well, those 4" conduits aren't lost. i put a seesnake in till i hit mud, and
used a locator to map them.... so they can be dug up and fixed later.