Earthing problem (probably)

[davesparks]

There could be multiple faults here, a fault which has resulted in a voltage appearing on the cases of equipment, and another fault which has led to the cases of the equipment not being connected to earth.

The last time I had a similar fault was after someone had fitted their own metal light switches, surprisingly had connected the CPC to the metal switch plate correctly. When I got there they were claiming to feel tingling when touching some of the light switches.
I found that when screwing back the metal plates they had nicked one of the live conductors shorting it to the CPC. But the CPC was not connected to earth so the effect was to make all of the metal switches live with reference to earth. Thanks to the wooden floors in the house nobody got a severe shock from this.
With Further investigation I found a joint box under the floor which had all of the CPCs stripped and sticking out waiting to be connected, I can only assume the person who rewired the house put the lid on the JB and forgot to then connect the CPCs (it was done in the era of connecting CPCs outside the JB)

 

[Dave OCD]

You'd have thought that only the one switch where they'd nicked the live would have voltage on the metal plate with no CPC continuity to anything else ?

 

[Marvo]

I'd agree it sounds like you may have multiple faults resulting in the tingling you get. As suggested get a decent sparky to do the tests.

 

[Des 56]

Where there are no metal parts,it seems to me static discharge the likely culprit
After having a tingle from the amplifier,has it ever happened where 2 tingles were experienced?


The washer tingle needs investigation

 

[westward10]

Sounds like a classic loss of supply earth.

 

[davesparks]

You'd have thought that only the one switch where they'd nicked the live would have voltage on the metal plate with no CPC continuity to anything else ?

There was cpc continuity between everything on the outgoing side of that JB, all of the others JBs had the cpcs connected.

 

[Dave OCD]

Ah ok that makes sense.