Outlets mounted on concrete walls

Jim Port

He is trying to fit two runs of cable in the 1/2" EMT. Without the sheath it fits easier.

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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.

hammerlane

You're right. That is his dilemma. Didn't catch that part.

ryan50hrl

Yep.....I want to run down to one set of outlets.....up to the next.......and i've already got the 1/2 inch cut and assembled....I think i'll go with stick's idea.....a central junction box and run out to the outlets with a single run of romex...

jbfan

Use two pieces of conduit to each box.

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hammerlane

Two sticks of 1/2" EMT to each box...another good option

Attached Images

 

stickboy1375

I didn't look, but it always needed protection from physical damage, I just hardly ever see this an issue... so you are saying no matter what it needs to be protected when strapped to a wall? I find that a little obsure.

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kbsparky

I can fit 2 pieces of 12-2 into a single piece of ½"EMT. As long as you keep `em flat, no twists, kinks, etc, it goes right in!

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stickboy1375

it's not the fact that it doesn't physically fit, but a code issue.

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ryan50hrl

I'm trying to stick to the letter of the code as much as possible......so I've been trying to watch things like box and conduit fill requirements.....

Hey Stick.....got a nice chart like that for box fill requirements???

stickboy1375

http://ecmweb.com/code-basics/box-fill-calculations

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Jim Port

From the 2011 334.15

(C) In Unfinished Basements and Crawl Spaces. Where
cable is run at angles with joists in unfinished basements
and crawl spaces, it shall be permissible to secure cables
not smaller than two 6 AWG or three 8 AWG conductors
directly to the lower edges of the joists. Smaller cables
shall be run either through bored holes in joists or on running
boards. Nonmetallic-sheathed cable installed on the
wall of an unfinished basement shall be permitted to be
installed in a listed conduit or tubing or shall be protected
in accordance with 300.4. Conduit or tubing shall be provided
with a suitable insulating bushing or adapter at the
point the cable enters the raceway. The sheath of the
nonmetallic-sheathed cable shall extend through the conduit
or tubing and into the outlet or device box not less than
6 mm (1⁄4 in.). The cable shall be secured within 300 mm
(12 in.) of the point where the cable enters the conduit or
tubing. Metal conduit, tubing, and metal outlet boxes shall
be connected to an equipment grounding conductor complying
with the provisions of 250.86 and 250.148.
334.17 Through or Parallel to Framing Members. Types
NM, NMC, or NMS cable shall be protected in accordance
with 300.4 where installed through or parallel to framing
members. Grommets used as required in 300.4(B)(1)
shall remain in place and be listed for the purpose of
cable protection.

After reading this I may want to rethink my statement above. This just seems to say that conduit sleeves are allowed, but not required. Maybe the update class gave me the thought sleeves were required, and running boards were out.

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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.

stickboy1375

I agree...

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ryan50hrl

So how do I calculate how many can be in a box?

Jim Port

plastic boxes will be labeled with the number of allowable conductors. For metal boxes you use Table 314.16(A).

Table 314.16(A) Metal Boxes

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stickboy1375

Read the entire link I posted below the pics I posted...

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