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#54847 - 08/08/05 09:36 PM Maximum distance between boxes?  
bot540  Offline
Member
Joined: Sep 2004
Posts: 174
Vernon Hills, IL
I'm having trouble finding the article that discusses the maximum distance allowed for conduit between boxes. Thanks.


Jesus may have been a capenter,but God was an electrician.Genesis1:3

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#54848 - 08/08/05 09:48 PM Re: Maximum distance between boxes?  
ShockMe77  Offline
Member
Joined: Jun 2005
Posts: 821
Rahway, New Jersey
Well, what kind of conduit?

Chapter 3 of your code book covers all kinds of conduit.


#54849 - 08/08/05 09:54 PM Re: Maximum distance between boxes?  
bot540  Offline
Member
Joined: Sep 2004
Posts: 174
Vernon Hills, IL
I was always told that you can't have more than 100 feet between boxes, but I can't find it in the code book.


Jesus may have been a capenter,but God was an electrician.Genesis1:3

#54850 - 08/08/05 10:07 PM Re: Maximum distance between boxes?  
e57  Offline
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Joined: May 2003
Posts: 2,876
S.F.,CA USA
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"Well - I oughta....." -Jackie Gleason

#54851 - 08/08/05 10:40 PM Re: Maximum distance between boxes?  
Fred  Offline
Member
Joined: Apr 2001
Posts: 449
Straughn, IN 47387
The maximum length of conduit between boxes is the circumference of the earth. More than that and you will have over 360º of bends in your run. But seriously, it's not restricted by distance, it is restricted to 360º degrees of bends between pull points. I have pulled wire through 700'runs of conduit using a Mightymouse.


#54852 - 08/10/05 01:05 AM Re: Maximum distance between boxes?  
Larry Fine  Offline
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Joined: Feb 2005
Posts: 693
Richmond, VA
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#54853 - 08/10/05 07:18 AM Re: Maximum distance between boxes?  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
The only other restirction, is the pulling force and sidewall pressure that will result when the conductors are pulled into the raceway. If this is a long pull with large conductors, then you need to do a pulling calculation to make sure that the conductors won't be dammage when pulled into the raceway.
Don


Don(resqcapt19)

#54854 - 08/13/05 01:58 PM Re: Maximum distance between boxes?  
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
Saw an artical in EC&M a while back that had calculations and formulas for pulling. Side wall and drag resistance, ect. thought I saved it, but.... lost somewhere in this box next to me....

I'll have to admit, I never learned them, and have gone on experiance for this type of thing, and over-build/design if at all worried....

Found it: http://ecmweb.com/mag/electric_simple_calculations_cable/index.html


Mark Heller
"Well - I oughta....." -Jackie Gleason

#54855 - 08/13/05 02:33 PM Re: Maximum distance between boxes?  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
You can also check out this free online tension calculator.
http://www.electrician.com/electa1/ductwirepull.html


Bob Badger
Construction & Maintenance Electrician
Massachusetts


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