fishing wires through conduit - Graybeard Outdoors
 
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post #1 of 9 (permalink) Old 10-11-2012, 08:52 PM Thread Starter
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Default fishing wires through conduit

Tie a cotton ball on some builders' string. Stick that end in the conduit and put a vacume cleaner on the other end.
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post #2 of 9 (permalink) Old 10-11-2012, 08:58 PM
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Default Re: fishing wires through conduit

Saw a guy do it with something like dental floss and a blower dryer.
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post #3 of 9 (permalink) Old 10-11-2012, 10:15 PM
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Default Re: Fishing Wires Through Conduit

A coworker and I were getting ready to pull some fiber optic line through about 515' of "fresh" conduit. Tied a piece of plastic, a sandwich bag I believe, to a length of regular plastic pull string and sucked it through in about 25-30 seconds, maybe less with the aid of a fairly large shop vac. I had never seen it done before and I was amazed at the speed the string peeled out of the box and how fast I was told over the radio to turn the vacuum off because the plastic and the start of the string had been "swallowed" by the vacuum cleaner on the far end. We didn't install any pull boxes for the string to go through because we had pretty much a straight shot from start to finish.

I was impressed.

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post #4 of 9 (permalink) Old 10-15-2012, 01:34 PM
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Default Re: fishing wires through conduit

I'm a retired electrician, and have used that method for a long time (since 1962). The thing we used was called a "rat", made out of plastic foam, with a stiff wire through it. If there is a burr inside the conduit, a cotton ball would either get stuck or shed some material, losing vacuum. I have had to take a lot of conduit down to clear stoppages because of foreign material in the way.

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post #5 of 9 (permalink) Old 12-01-2012, 11:25 AM
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Default Re: fishing wires through conduit


Thanks for this great information guys. I am currently working on a project, and couldn't figure out how to do this.

Mannyrock
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post #6 of 9 (permalink) Old 12-01-2012, 11:52 AM
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Default Re: fishing wires through conduit

Quote:
Originally Posted by mannyrock

Thanks for this great information guys. I am currently working on a project, and couldn't figure out how to do this.

Mannyrock
How about a fish tape? I've used the air method with conduit up to 200' long and 4" in diameter. Used a baggie and a compressor.
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post #7 of 9 (permalink) Old 12-09-2012, 10:56 AM
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Default Re: fishing wires through conduit

the screw type conduit connectors don't seal well enough. always use the compression ring type connectors.
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post #8 of 9 (permalink) Old 07-15-2014, 01:39 PM
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Default Re: fishing wires through conduit

Kroger or walmart bag on a string with a vaccum cleaner works great. It expands to fill the pipe and creates a good seal.

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post #9 of 9 (permalink) Old 07-15-2014, 04:04 PM
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Default Re: fishing wires through conduit

Around here they use a thing made to fit each size pipe that has a thin string in it that come somewhat like what a bow hunter attaches to his arrows. Or they use the foam plug with an eye bolt in it with some poly twine.




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