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Maximum distance between boxes? #54847 08/08/05 09:36 PM
Joined: Sep 2004
Posts: 174
B
bot540 Offline OP
Member
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
Work Gear for Electricians and the Trades
Re: Maximum distance between boxes? #54848 08/08/05 09:48 PM
Joined: Jun 2005
Posts: 821
S
ShockMe77 Offline
Member
Well, what kind of conduit?

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

Re: Maximum distance between boxes? #54849 08/08/05 09:54 PM
Joined: Sep 2004
Posts: 174
B
bot540 Offline OP
Member
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
Re: Maximum distance between boxes? #54850 08/08/05 10:07 PM
Joined: May 2003
Posts: 2,876
E
e57 Offline
Member
How long is your fish tape?


Mark Heller
"Well - I oughta....." -Jackie Gleason
Re: Maximum distance between boxes? #54851 08/08/05 10:40 PM
Joined: Apr 2001
Posts: 449
F
Fred Offline
Member
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.

Re: Maximum distance between boxes? #54852 08/10/05 01:05 AM
Joined: Feb 2005
Posts: 693
L
Larry Fine Offline
Member
[Linked Image from toonopedia.com]


Larry Fine
Fine Electric Co.
fineelectricco.com
Re: Maximum distance between boxes? #54853 08/10/05 07:18 AM
Joined: Nov 2000
Posts: 2,148
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resqcapt19 Offline
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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)
Re: Maximum distance between boxes? #54854 08/13/05 01:58 PM
Joined: May 2003
Posts: 2,876
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e57 Offline
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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
Re: Maximum distance between boxes? #54855 08/13/05 02:33 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
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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