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Old 02-11-2008, 08:26 PM   #16
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Bending EMT conduit around 90 degree corner


They don't allow MC or flex in Chicago???


Wow.



It seems to me that a 1/2" EMT 90 would fit in a 2x4 wall.



Can you remove the stud and notch it from the back side?


Can you drill it and slip short sections in?

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Old 02-11-2008, 10:30 PM   #17
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Bending EMT conduit around 90 degree corner


If you could post a pic, I could totally help. NEVER bury a jake fitting, LB or other conduit body. Couple of ways you can do this. One: Get yourself a short radius bender. Not making this up. This tool exists and can be used in a pinch. The other is simply bend an offset AWAY from the face of the stud. Then when the 90 is in the corner, it will have more room to clear the sweep. When you make the turn, keep it towards the back, and offset it to hit your next box. I'm a computer dummy, but I'll try to draw something up that I can show you better with.
Bending conduit is what I do.
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Old 02-11-2008, 10:31 PM   #18
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Bending EMT conduit around 90 degree corner


If you want to see my credentials, check out the picture post: switch gear pipe work.
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Old 02-11-2008, 10:53 PM   #19
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Bending EMT conduit around 90 degree corner


Here is my poor rendition of what I was talking about. I know it looks like a child's drawing. Forgive me. Hope it helps. Yes, you will need to couple a few pieces together. For the record, Chicago does allow Romex, but only for temporary lighting. Also BX is limited to existing installations where you have to fish behind walls. Greenfield is same, and if exposed can only run six feet.
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Bending EMT conduit around 90 degree corner-box-box-90.jpg  

Last edited by goose134; 02-11-2008 at 10:55 PM.
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Old 02-12-2008, 12:01 AM   #20
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Bending EMT conduit around 90 degree corner


Might be a poor drawing but I think that is a pure genius idea.
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Old 02-12-2008, 12:53 AM   #21
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Bending EMT conduit around 90 degree corner


Stubbie .,, I know you done alot of commercal / Industrail work so far but did you recall see one EMT bender it have small bending radius ??

I have old bender with that tight bending radius but i dont use it often unless it is a last restort useage.

that bender it have either 3 1/2 inch radius or 4 iam not sure which one is which but it sure pretty tight bend compared to standard EMT benders most are usally about 5 inch radius

Merci, Marc
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Old 02-12-2008, 04:28 AM   #22
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Bending EMT conduit around 90 degree corner


I am even worse at drawing than goose so I will try to explain a possible remedy. it will take two 90 bends.

first, as the conduit nears the end of the wall, make a 90 bend do that it goes up or down (whatever works for you) and the resulting vertical pipe is against the next flat you want to be on. Then bend a 90 bend so that it turns the direction horizontal again. It does change the elevation about 8 inches so it is not always usable but it removes the problem you are having. It can be made so it is totally inside the the studs this way if you want or it can be surface mounted as well.

well, for some reason I cannot upload my crummy drawing so hopefull the written explanation is understandable.

If thisis surface mounted, you can use an LL or LR to make the corner as well and it will allow youto be able to pull the wire around the corner.

Last edited by nap; 02-12-2008 at 04:30 AM.
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Old 02-12-2008, 06:33 AM   #23
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Bending EMT conduit around 90 degree corner


Quote:
I have old bender with that tight bending radius but i dont use it often unless it is a last restort useage.
Marc, I think we are talking about the same bender. And yes, it ONLY gets pulled out in desperation. nap, what you suggest would absolutely work as well. I was simply trying to minimize bends.
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Old 02-12-2008, 07:19 AM   #24
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Bending EMT conduit around 90 degree corner


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nap, what you suggest would absolutely work as well. I was simply trying to minimize bends.
well, if OP wants it in the wall, that is about the only way tp have the conduit in the wall. What OP could add to this if degree of bends is a problem is install a 4 square box with mud ring both before and after this double 90 set-up and use blank plates to cover them once the wall is finished. (I would use 2 gang since it would make access easier)

If he wants the boxes at the same level as each other, he could even throw another 90 bend and bring it back down to the same level as he started at. If he doesn;t want them so close together, he could run either horizontal longer so they are spaced apart.

Next problem.
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Old 02-12-2008, 09:26 AM   #25
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Bending EMT conduit around 90 degree corner


Let's see now... Starting at an outlet box 14 inches above floor level for a receptacle, conduit runs horizontally towards corner. Do a 90 degree bend to vertical upward. Do a 90 degree bend to horizontal but going out the next wall. We're about 24 inches above floor level. Do a 90 degree bend to vertical and a 90 degree bend to horizontal to resume 14 inches above ground and arrive at the next receptacle box.

What is the practical limit for how many degrees of bend between junction boxes or pull openings (such as a flap at an elbow)? I thought it was 270 degrees regardless of direction or combination of directions. If this is true, the above routing would not work without an access in the wall somewhere.

Last edited by AllanJ; 02-12-2008 at 09:28 AM.
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Old 02-12-2008, 11:06 AM   #26
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Bending EMT conduit around 90 degree corner


Thank you all, this is proving extremely valuable to me. My basic understanding of Chicago-area code is that I am allowed 4 bends in a run, not sure if there is a total degree limit to that or not (anybody who can verify?). On the point of bends, does an offset count as 1 or 2? Seems if it counts as 2 then I quickly run out (an offset on each side plus a 90 puts me at 5 bends). Finally, to everybody out there really good at the math involved in making bends of the right lengths, are there any good cheat-sheets out there that you would recommend? I've already found a few that I think are useful, but that's from my uneducated brain Thanks again, if nothing else I am at least learning!
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Old 02-12-2008, 12:10 PM   #27
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Bending EMT conduit around 90 degree corner


Yes Marc we used them a lot ( well actually a little) they are called hickey benders. But they take some practice to get the knack of getting the sharper 90 bend without collapsing the pipe. I couldn't justify bringing that up cause he would have to buy one most likely for one lousy bend.


Last edited by Stubbie; 02-12-2008 at 03:19 PM.
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Old 02-12-2008, 05:31 PM   #28
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Bending EMT conduit around 90 degree corner


Quote:
Originally Posted by AllanJ View Post
Let's see now... Starting at an outlet box 14 inches above floor level for a receptacle, conduit runs horizontally towards corner. Do a 90 degree bend to vertical upward. Do a 90 degree bend to horizontal but going out the next wall. We're about 24 inches above floor level. Do a 90 degree bend to vertical and a 90 degree bend to horizontal to resume 14 inches above ground and arrive at the next receptacle box.

What is the practical limit for how many degrees of bend between junction boxes or pull openings (such as a flap at an elbow)? I thought it was 270 degrees regardless of direction or combination of directions. If this is true, the above routing would not work without an access in the wall somewhere.
it is 360 between pull points (per NEC. I don't know if Chicago has a different limit) so you are not past that but you do not need to do the last 90 to horizontal. Simply come into the top of the box an that would reduce it down to 270 so, yes, my directions will work the way you ran the pipe but the way I would have run it, I even have 90 of bend left if I needed it.

and if you are putting this in the wall why do you need an offset?

what size conduit are you using and what brand bender do you have? (the measurements for bending are dependant on both of those)

Last edited by nap; 02-12-2008 at 05:34 PM.
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Old 02-12-2008, 07:58 PM   #29
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Bending EMT conduit around 90 degree corner


Stubbie, Marc what you are referring to is a hickey. It only works for rigid. I'm sure you both know this. What I am talking about is an actual bender with a small foot pedal, radius on the bottom and usually green. Short radius bender. Not a hickey.
Chicago same as NEC regarding bends in pipe. No more than 360 deg.

nap, my way will work. I've roughed a lot of houses in my early days. Your way will work but take a lot of unneeded work.

Last edited by goose134; 02-12-2008 at 08:01 PM.
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Old 02-12-2008, 08:12 PM   #30
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Bending EMT conduit around 90 degree corner


Actually what we used was a hickey bender for rigid but we used a lot of emt also. I'm not sure if I ever used your short radius bender but I confess it does exist. I had to call a good friend who is a conduit bender for a local industrial contractor and sure enough he says there is one.....not that I doubted you....but I frankly have never used one. But below is an image of what you are talking about....I think...


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