small voltage about 1V on earthing cable

[DDnot]

I was doing tests and my tester sometimes did not let me to do the test as it was detecting some voltage on earth. I disconnected the earthing cable and even after that it was showing about 1V on it. After connection in sockets it is often 0 then 1 then 0. I have plenty of theories but what explanation you could give?

 

[telectrix]

try an analogue meter before delving into finding something which isn't really there.

 

[KAS1]

1volt beware

 

[Des 56]

Best check if next door are missing one of their volts,if they find out there could be potential trouble

 

[SJD]

Replacing a CU in a house with an old disused analog coax CATV feed, it turned out there was around 1V on the coax outer, which by chance was shorted to the installation E in a twin metal back box where there was a coax socket and a single 13A socket. The coax outer should have been isolated from the installation earth but had been damaged and trapped against the metal box.

The net result appeared to be a small current flowing round part of a socket RFC via this coax and bonding to gas at a boiler, and this upset the r2 continuity measurement (using a KT64), which read >1999 Ohm, until I disconnected the offending coax, when I got a sensible reading. It took a little while to work out what was going on.

 

[telectrix]

nice play on words there des.

 

[Guitarist]

Replacing a CU in a house with an old disused analog coax CATV feed.

I think that you'd be better off replacing it with another CU. Up to you though...