Underground wire - cable locator

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1793

Senior Member
Location
Louisville, Kentucky
Occupation
Inspector
I have had a need lately to locate buried lines. I have rented a tracer unit manufactured by White's Electronics. I am interested in purchasing a unit like this for future use.

I'm looking for any input that others may have as to types, models and $$. This will be used primarily for residential applications.

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charlie tuna

Senior Member
Location
Florida
Re: Underground wire - cable locator

i have traced underground raceways and problems using an old 3-m circuit tracer with a nine volt battery. this unit cost me about $360.00 15 years ago.... it ain't the best--but it works!
 

tshea

Senior Member
Location
Wisconsin
Re: Underground wire - cable locator

charlie tuna said:
i have traced underground raceways and problems using an old 3-m circuit tracer with a nine volt battery. this unit cost me about $360.00 15 years ago.... it ain't the best--but it works!
I too have one of those old tracers. I wasn't as lucky as you. Most of the time it didn't work, even with fresh batteries, etc.

I did rent a "thumper" once. I was able to locate the broken wire under ground at a depth of 5'. This was in a campground. One of the phase wires was corroded completely through.

**A thumper is a piece of test equipment that injects a high voltage pulse through the line. It has an amplified "sonar" and headphones that you use to pinpoint the sound of the pulse underground. Amazingly, it sounds just like a thump.**
 

mdshunk

Senior Member
Location
Right here.
Re: Underground wire - cable locator

I use a sub for this. That tracing gear is so expensive, I never cared to own it for the 2-3 uses per year I'd get out of it. It costs me 50 to 100 bucks for a sub to do it for me.
 

charlie tuna

Senior Member
Location
Florida
Re: Underground wire - cable locator

the main problem with the 3-m unit is being able to hear it! but i have traced plenty of parking lot problems with it. it is an old unit! i'm wondering if they have improved it's capabilities? this would be an inexpensive unit and usible for service work on inside circuits!
 

1793

Senior Member
Location
Louisville, Kentucky
Occupation
Inspector
Re: Underground wire - cable locator

I have found that Greenlee has a portable unit #508S sold through Grainger for about $250.00. It appears to work for buried and in wall wire tracing.

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dcarnell

Member
Re: Underground wire - cable locator

Hello,
I need advice on how to locate low voltage (24v?)irrigation valve wiring to find a stuck valve. Two contractors have tried without success to locate the wiring, one dug up a third of my backyard, no luck.
I've tried a device called "click it" which cycles the valve solenoid on-off repeatidly so that it can be heard, but it must be buried under several inches of soil I can't hear the clicking.
Do you know of an instrument/device that can sense buried wiring 12-inches below grade?? Where can I rent the equipment?
Thanks.
Don
 

George Stolz

Moderator
Staff member
Location
Windsor, CO NEC: 2017
Occupation
Service Manager
Re: Underground wire - cable locator

You could see if a local electrician has an underground locator. We don't have a lot of tools at our shop, and we do have one of those. They can be a little tricky to use (and, let's face it, they bought one for themselves, not you), so chances are, you'd pay for a service call for someone to come out and locate it for you. Perhaps even fix it for you.

You might try a rental place.

Maybe Home Depot.

If you'd want to buy one and become a freelance locator, then try an electrical supply house. :)
 

hurk27

Senior Member
Re: Underground wire - cable locator

By dcarnell: I've tried a device called "click it" which cycles the valve solenoid on-off repeatidly so that it can be heard, but it must be buried under several inches of soil I can't hear the clicking.
I need advice on how to locate low voltage (24v?)irrigation valve wiring to find a stuck valve .
I don't think you can use "Click It" to find a valve that has a stuck plunger. :D
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
Re: Underground wire - cable locator

Find someone who can use "witching" sticks. I have seen utility locaters find things with the sticks that they could not find with their expensive electronic locators.
 

iwire

Moderator
Staff member
Location
Massachusetts
Re: Underground wire - cable locator

Originally posted by don_resqcapt19:
Find someone who can use "witching" sticks.
Don this just blows me away, a guy with so much knowledge of science and you want to turn to a couple of sticks. :p
 

hurk27

Senior Member
Re: Underground wire - cable locator

Bob there must be something with it, as back when I lived in the Everglades, Exon paid for several dousing locates and they found oil faster then the other methods. One Exon engineer came into my dads bar on the loop, and he just kept saying it can't be true, but he seen it with his own eyes. :D
 

iwire

Moderator
Staff member
Location
Massachusetts
Re: Underground wire - cable locator

Originally posted by hurk27:
Bob there must be something with it,
And that 'something' would be described as what?

Magic? :roll:

I doubt I will ever believe 'witching' is a valid locating method.

Exon paid for several dousing locates
And some police Dept's. have hired psychics, that is not proof of the effectiveness of either.

JMHO, Bob
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
Re: Underground wire - cable locator

Bob, George,
I have seen guys find things that they couldn't find with all of the expensive equipment. I never believed this stuff until about 15 years ago. We had a contractor do some locating for us in a college boiler room where we were installing a new peak shaving generator. He set up his equipment and did his thing, and then he pulled out two "sticks". I was giving him, "what's going on here, we are paying you good money for this job". He told me that he often finds things with the "sticks" that his equipment won't. I watched him walk the area and every time he was above the things that his equipment found, the sticks crossed. I said, you know where the conduits are and are making them cross...he said here try it and close your eyes as you walk...I did and they crossed for me too. He told me that he sells the expensive equipment and teaches class on the use of that equipment. In his classes he always teaches the "sticks". At the beginning of the class most do not believe, at the end every one believes, but only about half can make it work. No one has any idea of how they work, but they work.
As far as the science of this, I think it is there, but we haven't discovered it yet. I don't believe that it is a physic thing but some physical effect that we don't yet understand.
Don
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
Re: Underground wire - cable locator

George,
Would you trust witching in lieu of locates via conventional means?
Given how far off some of my "JULIE" (Illinois one call locate service) are, yes, I will trust this if I know the guy and have seen his work before. I can sort of make it work, but do not use it enough to trust me doing it. Like I said, I have seen professional locaters find stuff that the expensive equipment could not find.
Don
 

dcarnell

Member
Re: Underground wire - cable locator

Guys,
Thanks for the advice..I may try witching I have a pair of sticks...I know I know science all that stuff...but I can't explain gravity either.
Don
 

1793

Senior Member
Location
Louisville, Kentucky
Occupation
Inspector
Re: Underground wire - cable locator

I have used the "witching" method before and most of the time I can find it. The "sticks" I use are metal coat hangers cut and straightened out with a bend so I can hold them. When you come across the "live" line the "sticks" will cross each-other.

Norb

PS I did not believe it either at first but after a few attempts with success, I'm a believer.
 
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