UG pipe location trick?

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romex jockey

Senior Member
Location
Vermont
Occupation
electrician
So we have a house, and a barn, pipe w/out anything in it is suspected to travel out to the barn.

We fished it ,but could not locate it @ the barn

We pulled the fish out, and laid it on the ground,and it was well inside the barn

So , is there a tool or trick that helps ?

thx to all helpful replies

~RJ~
 

Hv&Lv

Senior Member
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-
Occupation
Engineer/Technician
Metal detector works pretty good if you don’t have a pipe horn.
hook a water hose to it and look for a muddy spot.
 

romex jockey

Senior Member
Location
Vermont
Occupation
electrician
air & water might work.....not sure about metal detector(s) in a barn full of metal......& it's a 'log barn' matching the log cabin......~RJ~
 

roger

Moderator
Staff member
Location
Fl
Occupation
Retired Electrician
A cable locator. Ours will locate a metal gas line, it sure should a metal conduit.

Tie a 16 stranded to the fiberglass fish tape. Shove it in, then locate the wire, or put the signal on a metallic fish tape.

Yep. :thumbsup:

Roger
 

synchro

Senior Member
Location
Chicago, IL
Occupation
EE
In your situation a cable locator would normally have one transmitter lead connected to the metal pipe and the other to a local earth ground (even a screwdriver stuck into the ground). If this works out that's fine.

However, the signal may die out too soon because most of the signal returns locally though the nearby earth ground. If the signal dies out too much when you move outward to the required distance I suggest the following:
Insert a small ground rod in the earth somewhat beyond where you are interested (like the other side of the barn). Then connect the transmitter's ground terminal to this ground rod using a wire that's 1.5 to 2 times longer than a direct route so this wire can be moved well away from the suspected path of the pipe. That way you have a larger current loop for the test signal, and so the ground return current doesn't interfere with the magnetic field around the pipe that you want to detect. Also, the transmitter signal current will flow through most of the pipe without significant amounts being bled off to earth ground. So you should have a strong signal to pick up.
 
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