Piping back to back squares in block wall?

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Old 03-11-11, 06:50 PM
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Piping back to back squares in block wall?

What would be your method of installing conduit (1/2 emt) to 4 square on both sides of a block wall (back to back)? I couldn't come up with much aside from really destroying the block on one side to get room to fasten the connector, your thoughts please.
 
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Old 03-11-11, 07:32 PM
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A rigid nipple would work great, you can put outside locknuts on, install the box, and install the inside nipples.
 
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Old 03-11-11, 07:35 PM
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If you punch a hole large enough for the connector you can install the connector on both ends of the conduit. Connect the one end to the first box and insert into the hole. Place the second box over the end of the connector and install the locknut. You will need to align the boxes and mark the holes for the anchors to secure the box to the wall. Also drill a small indent behind the ground screw hole. you will need to measure the conduit length to match the wall thickness minus the slight thickness of the connector flange. Be sure to use the correct knockout so the boxes align.
 
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Old 03-11-11, 08:01 PM
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Could I use chase nipples instead, with locknuts?
 
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Old 03-12-11, 02:22 AM
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Chase nipples would be fine if you can find the correct length.
 
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Old 03-12-11, 06:09 PM
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True. That was dumb on my part... Probably end up going sch. 40 with a male terminal adapter, less block to remove, the slip side is only about 5/8" long. I figure the outside of the wall will probably spall on me and I wont have to chisel much at all
 
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Old 03-14-11, 12:37 PM
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If you have a hammer drill, you can drill a few pilot ~3/16", ~1/4" holes in a circle, then whack it right in the center with a hammer. You can get a pretty good circle broken through the block with this method.
 
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Old 03-14-11, 12:48 PM
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Today 03:37 PMibpooks
If you have a hammer drill, you can drill a few pilot ~3/16", ~1/4" holes in a circle, then whack it right in the center with a hammer. You can get a pretty good circle broken through the block with this method.
I'll have to rember that. I'm guessing you will have to brill in a conical shape to drill through concrete.
 
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Old 03-14-11, 01:01 PM
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But concrete block (AKA cinder block) is a lot easier to drill then real concrete. Just drill in perpendicular. My father would have just used a 3 pound hammer and a star drill.
 
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Old 03-14-11, 01:42 PM
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Real concrete you will need a big Hilti impact drill or a diamond core drill rig (a.k.a. business card of a concrete cutting/boring subcontractor).

(Or a steel-drivin' man like Ray's dad)
 
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Old 03-14-11, 02:59 PM
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Or a steel-drivin' man like Ray's dad
lol! That needs to be a smilie.

My father would have just used a 3 pound hammer and a star drill
What's a star drill?
 
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Old 03-14-11, 03:10 PM
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A hardened steel rod with a star-shaped point. Combined with a hammer, it was tool by which one bored through rock without machinery.
 
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Old 03-14-11, 03:13 PM
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A star drill is shown with a 3 lb hammer on this site

Google Image Result for http://hammerheadstoneworks.com/blog-images/quoins/lintel-star-bit.jpg

Check out the meter socket location. OOOPs.
 
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Old 03-14-11, 04:33 PM
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That picture would be a good canidate for a what's wrong here/diy don'ts sub-forum.
 
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Old 03-14-11, 05:51 PM
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What's a star drill?
It's basically a hammer drill less the hammer, you supply that! Once was enough for me! But, cinder block is another matter entirely, a chisel and a hammer will make a hole quickly.
 
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Old 03-14-11, 06:04 PM
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O/T
A few years back before one of the Summer Olympics North Korea built a huge stadium in a effort to impress the Olympic committee. One picture I saw showed scores of workers installing 10s of thousands of seats using star drills to install the bolts for the seats. Having actually used a star drill I didn't know whether to cry or laugh.
 
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Old 03-15-11, 08:45 AM
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You can see a view of that stadium during an astonishing propaganda show depicted in the "Vice Guide to North Korea". If you've got an hour or two to kill, look up the video series on Youtube. It's like looking through a lens into 1950 USSR, amazing people still live that way in 2011.
 
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Old 03-15-11, 12:34 PM
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Wink

About 50 mild hits in the same spot with a 2 lb ball pien hammer (using the ball end), makes a surprising clean 1" hole in the wall of a CMU.

more O/T: with my own eyes, I witnessed a crew of Chinese workers using mallets and chisels scoring old asphalt for removal, just ahead of automated asphalt laying machinery. Major 6 line highway, many, many miles long
 
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