Its been a shocking experience!

What could give that effect where the volts are there with the cutout fuse removed is incorrect polarity.

Does the problem still exist if
1/ the circuits are switched off via the individual MCB's in the consumer unit

2/ If the consumer unit main switch is off
Sponsored Links

The plumber described the shock as not always being there he would maybe be able to grip the pipeowork for up to 20 sec before he would feel the shock.

That is not static electricity. He is gripping the pipe that shocks with one hand, where is the other hand or any part of his body near touching other metal work or damp surface or damp wall.

It might be that the local network neutral is floating ( a network fault ) and if the CPC ( earth wire ) to the house is derived from that ( as in PME ) then anything earthed ( or equipotentially bonded ) in the house is not at true ground potential. The voltage on the floating neutral would vary as other houses switched things on and off.

Its a grant vortex oil boiler. Oil supply line in copper.

Is it your individual tank or a shared tank ? Could there be a metallic connection to another house via the oil pipe work. Any trace heating on the oil pipe work. ? Though I would think that the metal oil pipe would be
connected to other pipes inside the boiler via the metal work of the boiler framework.
not touching other metalwork in general just differing parts of the boiler.

oil tank is not shared. had been thinking of local fault, is there anyway to test for this to confirm?
Sponsored Links
Hi all,
Many thanks for all your help in aiding with the solution.

To give you all a update I contacted the local supplier and explained that people were getting shocks, they claimed that they needed various readings from my spark.

Spark materialised did tests and again found no issues, however out of curiousity he put his Megger from actual ground to pipework and recorded 50 volts.

Again contacted Scottish Hydro, explained issues and explained electrocution of plumbers, etc and within 2 hrs they had supply isolated to 13 meters in total. Eventually diagnosed fault with joint box underground, supply rejointed and problem disappeared!!

thanks again to everyone it is truly appreciated!!
however out of curiousity he put his Megger from actual ground to pipework and recorded 50 volts.

Isn't it amazing how that sort of result will trigger a rapid response from the DNO emergency crews.

Yet (as in another thread) the non urgent person sent by the DNO to investigate voltage variations doesn't check the neutral to true ground voltage when a broken neutral is often the cause of voltage fluctuations.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links