Crawford County, Robinson, Illinois | I'll bet you have to pull all the wires, but what do you have to lose trying to pull the 6 as you take out the 2's? You need lots of electrical snot, helps a lot. I always was generous with the product, and have had some success doing what you are trying, but not always. I would probably pull 3 new wires with the old 3 wires, but it wouldn't hurt to try to pull two first, usually can always pull them back. Worst part is where the pipe bends, if you have a way to avoid pulling through a bend, it will help a lot if you only have a straight pull. I had trouble with the wires getting tangled at the bends when I replaced new wires using old ones to pull.   I use the GB Wire-Aide.
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pulling elect. wire through conduit
