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Tool Talk Discussion Forum

Open 230v line

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Bill in Me.

06-27-2006 08:20:03




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I have a 230v line running 150' from my house that only has 115v on one side. How do I find where the break in the line is? I really don't want to dig up the yard anymore than necessary.




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Bill in Me

06-29-2006 18:23:00




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
Well, I have an electrician coming tomorrow with his test equipment to find the break. I want to thank all for their suggestions. This is a GREAT list.
Bill



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Stan in Oly, WA

06-28-2006 19:42:21




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
Hi Bill,

About a year ago the same thing happened at the apartment complex where I was maintenance supervisor at the time. One of the buildings lost 115V somewhere in the 250' or so between the transformer and the meter base panel furthest from it on the building. A company with equipment to locate breaks in lines couldn't locate it because their equipment wouldn't work through the blacktop of the parking lot that covered about 1/2 the run. A technician from the power company had been at the original installation ten years earlier and said he remembered seeing 2/0 aluminum cables lying in the trench without conduit, and construction debris kicked into the trench before it was backfilled. That particular instance of shoddy workmanship cost the current property owner almost $13,000. I thought it seemed like a lot of money until I saw what $500 will pay for on a commercial property, then it seemed like a good deal.

All the best, Stan

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John T

06-28-2006 14:02:50




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
Bill, Since you will have to buy the equipment or hire someone with it to locate the line break, you might wanna consider just renting a trencher and burying new UF cable or else bury conduit and run conductors inside it.

If you use ONLY 240 volt equipment at the remote site, it would only be necessary to run 3 conductor cable consisting of the two hot L1 and L2 Phase conductors plus the green/bare safety equipment ground (grounding conductor). HOWEVER if you intend to use both available legs of 120 volt PLUS 240 volt, you would need to run 4 conductor cable consisting of the two hot L1 and L2 Phase conductors plus the white Neutral (grounded conductor) plus the bare/green safety equipment ground (grounding conductor).

In the event you use a sub panel at the remote location DO NOT bond the Neutral and Equipment Ground Busses there as normally done at the Service Entrance Main Panel.

Best wishes n God Bless, dont get yer wires crossed now lol

John T

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souNdguy

06-28-2006 11:10:10




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
Beginning of this year i had the same problem... had one side of 220 die at the barn... Had a burn thru halfway between box and barn.. I bit the bullet, and dug the trnch and dropped a new line... Not fond of underground splices.

Soundguy



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JD9295

06-27-2006 23:30:52




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
I take it you have a DEAD SIDE? Your post looks to say your only getting 115 on a side. If you have a dead side and its hot a the house, rent a trencher and bury new



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Charles (in GA)

06-27-2006 19:00:02




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
Power and phone companies all have equipment that connects a transmitter to one end of the dead circuit and they can easily find the break or weak spot. Power company found a burn thru in the underground feed to my house with no effort at all. They spliced with some good machine set splices and heat shrink with sealer in it. Should last many years. They then kept checking and found two more "weak" places in the cables where they were starting to cook, but still passed current to some extent.

The equipment is out there, you just gotta find someone with it.

Charles

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buickanddeere

06-27-2006 15:08:56




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
As previously stated if the fault is in the cable she's done. And underground splice is a dodgy task to make long term. I burried the ne wrun from the house to the drive shed in 4" drainage tile. Should something ever go wrong it will pull out in a few minutes.



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genep

06-27-2006 14:09:57




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
When I was a lineman the utility co. owned a machine that was hooked to the faulty wire. The machine would build up several thousand volts in a capacitor and release it into the line. The result was a "thump" where the wire was open. Then you got to dig it up. Maybe there are better methods now.

If the wire is aluminum and the insulation has been damaged you're likely to have troubles from now on. Moisture gets in to the aluminum and turns it to powder. Unless the wire is in a really bad location you might be better served to cut a new ditch and install new wire. Make sure when you backfill that there is no debris to contact the wire as it will eventually push through the insulation and cause another failure.

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john-mi

06-27-2006 13:32:10




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
I had that happen once. Called Consumers Power Co., our power supplier. They hooked a huge generator to the line, and when they hit it with power the dirt flew into the air where the break was. Quite a sight to watch.



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RustyFarmall

06-27-2006 10:42:10




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
115 volts on one side, and the other side is dead?



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Bill in Me.

06-27-2006 12:59:21




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 Re: Open 230v line in reply to RustyFarmall, 06-27-2006 10:42:10  
I am getting power where the line exits the house and the switch on the other end is not the problem. The town dug a drainage ditch through the line and spliced it several years ago. I bet their splice came apart. Maybe they will find the break.
Bill in Me.



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fredo.

06-27-2006 10:32:59




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
Call miss dig see what she will do. She has a meeter that can find breaks. fredo.



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Richard H.

06-27-2006 08:56:36




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
Bill, Tic tracers have really come down in price over the years , sorta work like a stud finder. You may want to check and make sure the breaker is good and has a good connection in the house. With any luck it is just a fried stab on the breaker that connects it to the bus. If this is the case then your load in the shop is probably not balanced close enough. You will need to pull the breaker to inspect it correctly.
Richard

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RandyBee

06-27-2006 08:34:42




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
First check for 230 or 115 on either side at the source panel circuit breaker. Verify connections are tight and non corroded. If there is a break, I would replace the the whole run. Is this UF wire or conduit?



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old

06-27-2006 08:30:57




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 Re: Open 230v line in reply to Bill in Me., 06-27-2006 08:20:03  
That can be almost impossiable to find and you are also probably looseing power to the ground and costing you $$ unless its buryed in a pipe, which it should be by the way. About the only way I know to find it would be to go say to the middle and dig it up and check there for 230 volts if you have it there then you know its in the last half if not its in the first half and you have to go from there

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dan hill

07-06-2006 03:50:48




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 Re: Open 230v line in reply to old, 06-27-2006 08:30:57  
Ive used an rc bridge to find a break in a pump power cable.I took a capacity reading at both ends.The cable was above ground,may not work on buried cable.There was no insulation damage at the break.



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