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Joined: Sep 2004
Posts: 174
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bot540 Offline OP
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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
Joined: Jun 2005
Posts: 821
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Well, what kind of conduit?

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

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bot540 Offline OP
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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
Joined: May 2003
Posts: 2,876
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e57 Offline
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How long is your fish tape?


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

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[Linked Image from toonopedia.com]


Larry Fine
Fine Electric Co.
fineelectricco.com
Joined: Nov 2000
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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)
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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
Joined: Jan 2003
Posts: 4,391
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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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