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#69233 - 09/02/06 01:56 PM Pulling out old feeder wires underground
skipr Offline
Member
Registered: 01/03/05
Posts: 39
Loc: Huntington Beach, Ca.
I have 4 350 mcm wires about 250 feet underground from switchgear to vault. I have tried everything to pull these wires out, they don't move an inch. Anybody have a method I can try? The 4 inch conduit needs to be reused for the school facility upgrade.Plus I have salvage rights for the copper.

[This message has been edited by skipr (edited 09-02-2006).]
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#69234 - 09/02/06 03:16 PM Re: Pulling out old feeder wires underground
LK Offline
Member
Registered: 01/21/03
Posts: 1429
Loc: New Jersey
"The 4 inch conduit needs to be reused"

May be time to find a new engineer for this job, sounds like he thinks he can save some bucks by trying to resuse the conduit, we usually never bid a job like that, with the intention that the conduit can be reused, usually what you find even if you can pull the feeders, is damaged conduit, not much good for pulling new feeders, shorter runs smaller feeders, you may have some luck, when you dig up the existing run, you will most likely find, either crimped conduit or a shift in the run near a coulping, or bend.

Just wondering, what did the old feeders meg out at?


[This message has been edited by LK (edited 09-02-2006).]
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#69235 - 09/02/06 03:16 PM Re: Pulling out old feeder wires underground
renosteinke Offline
Cat Servant
Member
Registered: 01/22/05
Posts: 5316
Loc: Blue Collar Country
You're probably out of luck.... and have some digging in your future!

It is fairly common for ponduit to be damaged during backfill, compaction, etc. This is particularily true when the pipe was installed by non-electricians, not buried deep enough, clean fill was not used, and the pavemant is subject to heavy traffic.

First I would sugest hooking up an air compressor. You might blow the blockage free. You certainly ought to be able to hear the air exit the pipe.

If you haven't done it already, trace out the line, marking the pavement as you go along. It is possible that there is a buried splice box. (See "A well buried box" in the picture forum).
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#69236 - 09/02/06 04:26 PM Re: Pulling out old feeder wires underground
Theelectrikid Offline
Member
Registered: 04/30/04
Posts: 810
Loc: Levittown, PA
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#69237 - 09/02/06 04:43 PM Re: Pulling out old feeder wires underground
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2148
Loc: IL
You could try some of this . There is also a cable removal puller that puts a tension on the cable and then vibrates it to break it loose. I don't know who makes it. I remember reading about it a few years ago.
Don
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#69238 - 09/02/06 04:46 PM Re: Pulling out old feeder wires underground
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2148
Loc: IL
I've also had some luck hooking a fire hose to one end of the conduit and letting it flush out the silt. This will only work if you have a place to let the water and silt run out on one end. When I did it, we flushed from inside of the building out to a manhole and then pumped out the manhole.
Don
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#69239 - 09/02/06 06:02 PM Re: Pulling out old feeder wires underground
Surfinsparky Offline
Member
Registered: 07/29/05
Posts: 73
Loc: merritt island fl usa
Two words

Back hoe
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#69240 - 09/02/06 06:29 PM Re: Pulling out old feeder wires underground
LK Offline
Member
Registered: 01/21/03
Posts: 1429
Loc: New Jersey
If we installed the conduits like the utility does, there would be no problem, OVERSIZED, but usually when a contractor does the job, what is the smallest i can get away with, switchgear to vault, is usually oversized, and can be pulled.

[This message has been edited by LK (edited 09-02-2006).]
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#69241 - 09/02/06 06:43 PM Re: Pulling out old feeder wires underground
Surfinsparky Offline
Member
Registered: 07/29/05
Posts: 73
Loc: merritt island fl usa
A 4" conduit with 350 mcm in it should come out.Get a choker and some muscle.
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#69242 - 09/02/06 07:29 PM Re: Pulling out old feeder wires underground
Theelectrikid Offline
Member
Registered: 04/30/04
Posts: 810
Loc: Levittown, PA
Not to be cliche, but,

"Dynamite! TNT! Things that go boom! PBX! (Plastic Bonded Explosive, thanks Alan B! ) All that fun stuff that's illegal for good reason but we have around anyways!

Ian A.
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