AJJewsbury:
or, 8. (presuming the gas is plastic out of the ground) Isolate the installation, disconnect supplier's earth, test between supplier's earth and water pipe/stop tap - if over 23k Ohms then water pipe can't be extraneous. (If not over 23k Ohms it's harder to tell - it still might not be as there might be parallel paths lowering the reading).
- Andy.
AJJewsbury:
or, 8. (presuming the gas is plastic out of the ground) Isolate the installation, disconnect supplier's earth, test between supplier's earth and water pipe/stop tap - if over 23k Ohms then water pipe can't be extraneous. (If not over 23k Ohms it's harder to tell - it still might not be as there might be parallel paths lowering the reading).
- Andy.
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