There are both industrial and home owner cable pulling techniques. The former may involve heavy equipment and cable greasing and many people. Pulling cable on a small scale involves a snake and sometimes a pull cord. A snake is a coiled metal strip that you push through the conduit. When it comes out the other end or to a pull box you connect the wire and pull it back through the conduit. If more wire might be pulled later, also attach a pull cord so it will be left behind in the conduit for future use.
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A 100 foot fish tape and wire lubrication will be needed to make this wire pull.
You can pull 10 #3 gauge wires in a 2 1/2" conduit.
The chance of causing a break in the wire, or damage to the wire covering or coating. Also, it is not that you shouldn't pull on cables as in running electrical conduit in a building, it is common that the electrician has to "Pull"the wires through the conduit. The electrician generally knows how hard he can pull without damaging or chafing the wires.
Need to know the wire # size to compute wire fill in conduits
what is meant by pull back effect when pulling in electric cables in conduit