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On the subject of pulling the DNO fuse.

alanblaby
There have been a couple of reports here of the DNO confronting electricians who have pulled their fuse.


It's getting closer to home, a work colleague was doing a CU change on a domestic house last week, no isolator fitted, so he pulled the fuse (no seals present).

South Nottinghamshire.


Around 90 minutes later there was a knock on the door, a guy from Western Power was investigating a power loss at the property, reported by the Smart Meter phoning home.

He gave the sparky a talking to, and warned they are getting strict in pursuing people who do it, he said meter fiddling was rife, so any loss of power is checked out asap.
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    Alan Capon:




    Chris Pearson:

    . . . Why do Zs with the main fuse removed; and how? With your probe in the live terminal of the service head? . . . 




    Indeed. Zs can be measured at the “customer end” of the meter tails, which is where the DNO calculate it to. This is why they tell you the length and cross sectional area of the meter tails. Measuring where you are, I am assuming you have a Class 4 tester with Class 4 leads. 



    Alan, thank you. Yes, I suppose that it is possible that the meter or the line consumer tail, or a combination of the two could have a high resistance. However, if I get a high Zs (or Ze) at the main switch (been there, done that) the DNO will come out and do the necessary. At least if they are SSE.

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  • 0

    Alan Capon:




    Chris Pearson:

    . . . Why do Zs with the main fuse removed; and how? With your probe in the live terminal of the service head? . . . 




    Indeed. Zs can be measured at the “customer end” of the meter tails, which is where the DNO calculate it to. This is why they tell you the length and cross sectional area of the meter tails. Measuring where you are, I am assuming you have a Class 4 tester with Class 4 leads. 



    Alan, thank you. Yes, I suppose that it is possible that the meter or the line consumer tail, or a combination of the two could have a high resistance. However, if I get a high Zs (or Ze) at the main switch (been there, done that) the DNO will come out and do the necessary. At least if they are SSE.

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