Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-24-2008, 09:40 PM   #1
Member
 
Join Date: Dec 2005
Posts: 32
Share |
Default

Do conduit offsets count as bends?


Question to all the electricians that work with conduit in the Chicago area. The NEC state that a single run of conduit shall have no more than the sum of four 90 degree bends. I can read that in two ways. The first says that I can have no more than 360 degrees in a run. But if that were the case, wouldn't they have just said that? My question is, can I have four 90 degree bends, plus an offset or two? Or was my first assumption correct?

alvanos is offline   Reply With Quote
Old 02-24-2008, 09:57 PM   #2
Sparrky
 
Join Date: Feb 2008
Location: Northern California
Posts: 79
Default

Do conduit offsets count as bends?


well for whats its worth I am not in the Chicago area but here the off-sets which are degreed bends would count . . .more over . .the intent of the common sense rule was not allow more degrees of bend that could possible allow wire to pass

if you have spent anytime pulling wire...three 90% with solid wire is tough . . .4 is nye impossible . . .resulting in snapped or lost wires...insulation tore off...shorts

put in a junction box or so...and make the pull do-able

Kingsmurf is offline   Reply With Quote
Old 02-24-2008, 10:09 PM   #3
Power Gen/RS Engineer
 
Join Date: Jun 2006
Location: Oak Park, Illinois
Posts: 751
Default

Do conduit offsets count as bends?


Quote:
Originally Posted by alvanos View Post
Question to all the electricians that work with conduit in the Chicago area. The NEC state that a single run of conduit shall have no more than the sum of four 90 degree bends. I can read that in two ways. The first says that I can have no more than 360 degrees in a run. But if that were the case, wouldn't they have just said that? My question is, can I have four 90 degree bends, plus an offset or two? Or was my first assumption correct?
Christ, here we go!

I'm not an electrician but I've always understood this requirement to mean 360 degrees total bend in the run, whether it's 90's, kicks, offsets, etc. I've always installed pipe according to my understanding of this rule and in fact, I rarely put more than 270 degrees worth of bend in a pipe (based on advice that I was given from an old-timer IBEW GF).

Remember: you have to pull the wires and the more bends, the more resistance to pulling them. I'm not sure what your situation is, but it's always ok to throw in a 1900 box here and there.

TTFN,
Jimmy
__________________
Well, now, there's what's right and what's right and never the twain shall meet.
BigJimmy is offline   Reply With Quote
Old 02-24-2008, 10:26 PM   #4
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 5,407
Default

Do conduit offsets count as bends?


360 is the max total cumulative of all bends including offsets.


warning; the following advice is in contrast to code requirements and may result in a nice "red tag" from your local inspector.

With that said, I have snuck in an offset or 2 in a run that did have 360 in it already. If you use very low degree bends in your offsets, they do not tend to cause a problem. There are lubricants (Ideal yellow 77 is my preferred lube) to help reduce the friction.

You can (and should) place boxes to maintain max 360 in your run though. You can sometimes run a different route that resuces the bends required as well.

Stranded wire is definately easier to pull as well.
nap is offline   Reply With Quote
Old 02-24-2008, 10:28 PM   #5
Power Gen/RS Engineer
 
Join Date: Jun 2006
Location: Oak Park, Illinois
Posts: 751
Default

Do conduit offsets count as bends?


Quote:
Originally Posted by nap View Post
warning; the following advice is in contrast to code requirements and may result in a nice "red tag" from your local inspector.

With that said, I have snuck in an offset or 2 in a run that did have 360 in it already. If you use very low degree bends in your offsets, they do not tend to cause a problem. There are lubricants (Ideal yellow 77 is my preferred lube) to help reduce the friction.

You can (and should) place boxes to maintain max 360 in your run though. You can sometimes run a different route that resuces the bends required as well.

Stranded wire is definately easier to pull as well.
Nap-

All good points and I've cheated myself in the past, esp. with 10 deg. box offsets.
__________________
Well, now, there's what's right and what's right and never the twain shall meet.
BigJimmy is offline   Reply With Quote
Old 02-25-2008, 12:56 AM   #6
My License Ain't 4 Sale..
 
Join Date: Feb 2008
Location: Atlanta, Ga/Hamilton, Al
Posts: 1,813
Default

Do conduit offsets count as bends?


Quote:
Originally Posted by BigJimmy View Post
Nap-

All good points and I've cheated myself in the past, esp. with 10 deg. box offsets.
No cheat there. Box offsets don't count.

InPhase277
InPhase277 is offline   Reply With Quote
Old 02-25-2008, 05:42 PM   #7
Newbie
 
Join Date: Feb 2008
Posts: 9
Default

Do conduit offsets count as bends?


You can be liberal with your bends if your running stranded, but please be conservative with solid. Don't go over 360 degrees either way.
lg 38 is offline   Reply With Quote
Old 02-25-2008, 09:24 PM   #8
Union Electrician
 
goose134's Avatar
 
Join Date: Nov 2007
Location: Chicago, USA
Posts: 615
Default

Do conduit offsets count as bends?


As others have said, every bend counts. 360 degrees is the max. Just because you CAN pull it, doesn't mean you want to. Totally agree with the solid/stranded comment as well.

goose134 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Measuring EMT conduit for bends alvanos Electrical 4 02-15-2008 09:30 PM
Wire size and type in Rigid Metal Conduit Al the Diy guy Electrical 5 02-05-2008 08:31 PM
Pvc Conduit bobo60 Electrical 1 11-14-2007 09:52 PM
Conduit issues - help needed nymackem Electrical 19 11-05-2007 06:45 AM
Conduit through basement wall. bdalekid Electrical 13 01-31-2007 08:35 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.