Shock through pipe work

[piz]

Good morning I was called to a property last Friday where a customer was complaining about getting an electric shock from the shower and taps.
system is a PME
combi boiler so no heating element to check and shower is manual so no leakage on shower.
i have cross bonded all pipe work, when I put my amp meter around the pipe I get o.o87 MA this is 87 micro amps when I touch my voltage tester on any pipe work only 1 prong I get 2 volts but when I put the voltage tester between 2 pipes ie hot and cold cold to shower or radiator to shower I get continuity.
my question is this permitted and ok

 

[piz]

Sorry meant to say when u/s lights off on mcb voltage drops

 

[telectrix]

main bonding intact??? could be static.

 

[chrish_1977]

Sounds like there is something a miss there, if the voltage drops when then upstairs light mcb is switched off, should you not be testing the circuit to see why this is causing voltage on pipework

 

[piz]

Yeah that's tomorrow's job I left circuit off over the weekend

 

[Kamikaze]

Like Tel said, I would be inclined to check the main bonding first.

 

[dim_bulb]

Like the snowman kamikaze. Do a r2 long lead from met to the shower and taps

 

[singingfraggle]

I have had a similar problem in the past do a loop test .could be the incoming neutral broken and everything going thru earth. the dno had to repair the overheads

 

[Engineer54]

If it's an old house, check if some numbty has taken an earth off the pipework in the loft, for one reason or another. Had that in my sister house before i eventually rewired the house, a bare conductor into a JB on a lighting circuit for a 500W heater in the bathroom. All cables jammed in the 5A JB whose live conductors rubber insulation wasn't up to much after 45 years or so of service.... lol!!

 

[KAS1]

Seen that before on lighting circuits with no earth (1960's) earth wire taken from bathroom light/heater to water pipe in the loft and connected by an earth clamp l

If it's an old house, check if some numbty has taken an earth off the pipework in the loft, for one reason or another. Had that in my sister house before i eventually rewired the house, a bare conductor into a JB on a lighting circuit for a 500W heater in the bathroom. All cables jammed in the 5A JB whose live conductors rubber insulation wasn't up to much after 45 years or so of service.... lol!!