That sounds a bit iffy!!The total extent of their testing to prove the quality of their workmanship and my supply was to use one of these £50 check plugs before and after.
But I thought they would use something a bit more sophisticated than a £50 plug in tester? I thought they were more 'hobby' type testers? Gives me more faith using it .An earth fault loop reading, a voltage reading and a polarity check is all that is required to be carried out by the DNO.
In my area, London and the South East, it would not have been the DNO (UKPN) who arranged for the isolator as this would be the responsibility of the company who supply your electricity. Even so, the earth loop impedance should have been recorded and reported if not within spec ie. above 0.35 ohms assuming a PME supply. If this was not done and the reading is high then you should report it immediately direct to the DNO.The earth loop impedance at my meter tails is outside spec. Not a whole lot, but it's outside spec.
A plug type tester, even a good one, can't measure these low impedances with enough resolution to know that which is why I was a little surprised to see it used.
If it becomes a problem for me, i'll have the DNO back to fix it as they have an obligation to maintain a service after providing it.
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