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Underground Cable Tracing.

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An P.V.C./P.V.C.  cable is run in steel conduit underground from a farm barn to another location. It may run underground to some nearby concrete slabs previously used as a base for wooden sheds, or it may run for about 80 metres to some distant  derelict outbuildings.

I am not too familiar with all of the types of underground cable tracers available.

Which would be the best type of cable tracer to use to determine its run? There may be other buried metal to confuse some tracers. Will a signal injected into the cable be able to be detected by a cable tracer as the cable in inside steel conduit?

The cable is currently dead.

Thanks,

Z.

 

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  • 0

    Setting up a closed loop of plastic pipe with water in it isn’t a real life test.

    Two days ago on Wednesday evening I had a call from a gas distribution network operator subcontractor, they are replacing the old steel gas pipework that was installed on a housing estate in the 1940’s and 50’s and when they disconnected the old steel pipework to a meter the meter was electrically live.

    The house electrical installation is TT, but did not have an earth rod. The water pipework has been cut and adapted with plastic pipe and fittings being inserted, leaving the gas pipework as the only means of earthing for the installation. I ended up driving an earth rod in by torch light because they would not turn either the gas or electric back on until I declared it safe to do so.

    The gas guys and myself are fully aware that there is electricity flowing through the old metal gas and water supply pipework.

    Correct me if I’m wrong, but any single live electrical conductor has a detectable magnetic field around it, so a metal pipe carrying electricity will have an magnetic field around it.

    Last week I read a RICS homebuyers survey, there’s half a page about the electric substation that is on the other side of the road diagonal to the house, the surveyor hasn’t actually stated there is any confirmed health risk due to a field of influence around it, but he has put the wind up the potential purchasers by laying it on thick so they cannot come back in a few time claiming they weren’t told there might be an issue.

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  • 0

    Setting up a closed loop of plastic pipe with water in it isn’t a real life test.

    Two days ago on Wednesday evening I had a call from a gas distribution network operator subcontractor, they are replacing the old steel gas pipework that was installed on a housing estate in the 1940’s and 50’s and when they disconnected the old steel pipework to a meter the meter was electrically live.

    The house electrical installation is TT, but did not have an earth rod. The water pipework has been cut and adapted with plastic pipe and fittings being inserted, leaving the gas pipework as the only means of earthing for the installation. I ended up driving an earth rod in by torch light because they would not turn either the gas or electric back on until I declared it safe to do so.

    The gas guys and myself are fully aware that there is electricity flowing through the old metal gas and water supply pipework.

    Correct me if I’m wrong, but any single live electrical conductor has a detectable magnetic field around it, so a metal pipe carrying electricity will have an magnetic field around it.

    Last week I read a RICS homebuyers survey, there’s half a page about the electric substation that is on the other side of the road diagonal to the house, the surveyor hasn’t actually stated there is any confirmed health risk due to a field of influence around it, but he has put the wind up the potential purchasers by laying it on thick so they cannot come back in a few time claiming they weren’t told there might be an issue.

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