Wire over wire

jglavin427

Member
Location
Denver, CO
For you low-voltage guys: Is there ever a situation where you've pulled a new wire into a conduit with wire already installed? Is there any way to do this effectively?
 

egnlsn

Senior Member
Location
Herriman, UT
Occupation
A/V/Security Technician
All the time, and it's always a pain in the neck.

See if there's a wire that you can disconnect at one end and use that to pull in a string. Then, pull it, along with the new wire, back with the string.
 

kwired

Electron manager
Location
NE Nebraska
Depends on circumstances.

Sometimes with short run little or no bends - and a raceway that is not too full you can push the added conductor in.

Sometimes you can pull out an existing conductor and pull in a replacement plus your added conductor.

Sometimes you are not pulling anything out unless you pull all conductors out.

Sometimes you are not pulling anything out period - or anything else in either.
 

hbiss

EC, Westchester, New York NEC: 2014
Location
Hawthorne, New York NEC: 2014
Occupation
EC
Also, depending on the circumstances and the kind of wire, you may want to use a pulling lube. Not only makes the pull easier but it reduces the possibility of "burning" the existing cables or conductors.

-Hal
 
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