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#165301 - 06/25/07 11:17 AM Pull calculation  
mr_electrician  Offline
Member
Joined: Jun 2007
Posts: 106
London, Ontario
Does anyone remember the formula used to calculate how much force is needed to pull wire through a conduit?


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#165312 - 06/25/07 01:14 PM Re: Pull calculation [Re: mr_electrician]  
togol  Offline
Member
Joined: Sep 2005
Posts: 421
NW In. USA
here is a.pdf from Southwire it's kinda long but I think
the stuff you're probably looking for starts near pg.10

http://www.southwire.com/Southwire/Documents/Power%20Cable%20Installation%20Guide.pdf

Last edited by togol; 06/25/07 01:15 PM. Reason: forgot to add the link

Tom

#165313 - 06/25/07 01:31 PM Re: Pull calculation [Re: togol]  
togol  Offline
Member
Joined: Sep 2005
Posts: 421
NW In. USA
here is some more
the max tension should not exceed .008 times of the CM when pulled with a pulling eye attached to the copper conductor

Tm =.008 x N x CM

Tm = max pulling tension,9lbs)

N = number of conductors being pulled

CM = circular mill area of each conductor

there is a bit more to this than I typed..now I'm curious, are you having problems pulling that wire out ??

Last edited by togol; 06/25/07 01:33 PM. Reason: punctuation

Tom

#165315 - 06/25/07 01:36 PM Re: Pull calculation [Re: togol]  
mr_electrician  Offline
Member
Joined: Jun 2007
Posts: 106
London, Ontario
Originally Posted by togol
here is a.pdf from Southwire it's kinda long but I think
the stuff you're probably looking for starts near pg.10
This is not quite what I was looking for, but it is a very interesting manual to print off and keep. I will have to dig through my old notes from when I was an apprentice. It is not something you would use everytime. I am just curious on the force that will be needed so I can purchase a non stretch rope for the pull mentioned in "1200A shorted wire"......or something like that! Thanks for the help. It has been awhile since I have done any work that a contractor does. I got out of working for a contractor about 4 years ago and work as a maintenance electrician now.

http://www.southwire.com/Southwire/Documents/Power%20Cable%20Installation%20Guide.pdf


Never trust an electrician with no eyebrows!!

#165325 - 06/25/07 05:41 PM Re: Pull calculation [Re: mr_electrician]  
togol  Offline
Member
Joined: Sep 2005
Posts: 421
NW In. USA
there are other articles @ Southwire that might have that info too....

Last edited by togol; 06/25/07 05:46 PM.

Tom


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