So I have a plastic conduit that goes from my house to my shop. I need to pull 3-#12 stranded wires through it. I will have a 1/8" nylon pull rope. Also I will be using wire lube.
But wondering about the "knot" or rope to wire connection.
Gizmos like https://www.homedepot.com/p/Klein-Tools-1-2-in-Pulling-Grip-KPS050SEN/100662411 work like a charm if you can get one that is the right size for the number of wires that you are pulling. You insert the wires into the mesh and as you pull on the wire the mesh grips the wires. It's like magic.
If you are pulling 3 pieces of something like #12 THHN, you shouldn't have a problem as long as there aren't any sharp bends in the plastic conduit. Certainly the lube will make it easier.
What I would do is gather the 3 wires at the one end and make one longer to create a loop, which I would tape with electrical tape together. Then tie your string with whatever knot you like to the loop and tape that too.
One trick you might think about is also pulling an additional piece of string with the wires to leave in the conduit for future needs.
I do the staggered ends, leading wire bent over, wrapped in tape thing. Get a helper to straighten and feed the wires on the other end. If possible, I find it easier to lay out the entire wire length out on the ground to streamline the pull.
I realize that this is already in the ground, but when burying conduit I like to put in bigger than needed. For the 250' run to my shop I also buried a spare 2" conduit conduit run, empty except for a rope just in case.
This is just to switch a coach lamp by the shop door from the house. I am abandoning the underground line because of a break somewhere. So I thought I would use the extra conduit I installed years ago when I ran the main power out to the shop.
I've never seen Chinese handcuffs but I have heard these pullers compared to Chinese handcuffs before. The comparison was made by someone younger than me so it must not be just an age thing.
Chinese handcuff's were bamboo cut to long strips about 1/4" wide, then woven together to made a 1/2" cylinder with both ends open. You then compressed them and stick the index finger on each hand into the end of them.
Then when you try to pull each finger out they will grab your fingers and you cannot get out of them. Supposedly!
You can of course push both index finger toward each other holding the compression with thumb and middle finger and remove each index finger.