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Oil Pipe Bonding.

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A garden oil tank is made of plastic. It is supported on blocks off the ground. Its plastic covered metal oil pipe runs above ground along a wall into a bungalow to the oil boiler. From a visual inspection I believe that the metal pipe is NOT an extraneous-conductive-part, but have not electrically tested it yet.

But…………..there is an earth electrode at the tank position with a length of badly connected green and yellow wire that earths the metal pipe. Why do tank installers do that? So now do I:

a, Remove the earth electrode

or

b, Main bond the metal oil pipe?

Z.

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    If we are seriously worrying about PME, surely we'd certainly want to avoid diverted Neutral currents … meaning because there's an earth electrode at the tank, it would be preferable for the entire installation to be TT …

    It's what's done at filling stations - and don't forget, this pipe's not buried!

    Also worth remembering that in trying to “pull the ground up to PME", the EPR drops off over a distance of as little as 3.5 m depending on the electrode configuration, so it really depends how far the electrode is from any other buried metalwork connected to PME.

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  • 0

    If we are seriously worrying about PME, surely we'd certainly want to avoid diverted Neutral currents … meaning because there's an earth electrode at the tank, it would be preferable for the entire installation to be TT …

    It's what's done at filling stations - and don't forget, this pipe's not buried!

    Also worth remembering that in trying to “pull the ground up to PME", the EPR drops off over a distance of as little as 3.5 m depending on the electrode configuration, so it really depends how far the electrode is from any other buried metalwork connected to PME.

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