Low Earth Voltage in bathroom from bonded fittings

[Pete999]

The water outlet from the pump to the shower will be in plastic, therefore the shower not extraneous conductive. Is the radiator extraneous and conductive or is there any plastic plumbing? If you are connecting non extraneous parts via some form of bond, any voltage on the earth cable will be introduced to these parts. You already implied that there is something on the earth as there was a little spark when it was disconnected from cu.
Are you not making non extraneous conductive parts into extraneous ones and then wondering why there is a voltage on them?
Clamp the earth, find the earth leakage and go from there

Don't think the OP is an Electrician or any Electrical knowledge

 

[Wilko]

When you do get a tingle (sorry not meant to sound funny) what are you standing on ?

 

[static zap]

I get the odd tingle , wince these days .
Nothing electrical , just my body telling me off for an unusual stance/position ( and my not being 25 any more)
..Nerve impulses going for a wander..
(common in the bathroom -Plenty of hard suraces)

 

[Pete999]

I get the odd tingle , wince these days .
Nothing electrical , just my body telling me off for an unusual stance/position ( and my not being 25 any more)
..Nerve impulses going for a wander..
(common in the bathroom -Plenty of hard suraces)

You as well Zap?

 

[static zap]

You as well Zap?

I know it me ,as everthing is bonded , (and have no 12V alarm cables-- battery backed ?)

 

[Pete999]

I know it me ,as everthing is bonded , (and have no 12V alarm cables-- battery backed ?)

Must be your electric personality.

 

[telectrix]

i get tingles as well, in bed. usually she just tells me to go to sleep, you randy old fart.

 

[PEG]

I think the OP needs to get some strips of copper and zinc,and sort through the fruit bowl,for lemons...

 

[KEV 1 N]

I had to investigate something like this a couple of years ago. I found that that shower cubicle was live

I foolishly drilled one of my own cables (for under cabinet lights) when fitting my kitchen last year, although I realised it was very close to where I'd drilled, I tested the cable and it appeared to be undamaged, however it turned out the screw I put in was touching the live and the metal capping, so when the lights were on, the wall was live....now this only came to light (pun intended) whilst grouting at night (lights on)...kept getting zaps when sponging the grout in and resting other hand on the cooker....had 100 or so volts between wall and earthed cooker!
Maybe you have a similar problem?

 

[Kris Dor]

Hi Mhar, Thanks for your reply, no, the rad is copper all the way so part of the earth, the shower hose is Extraneous as you said the connector is plastic. since the unit is earthed and the rad is earthed and bonded to each other I guess the difference is because the voltage is making the hose conductive through the water. Since water is a bad conductor this would account for only 0.2v on the hose and 2v on the rad (or 2v and 12v after shower is run) I haven't and wouldn't be so mad as to connect an earth from the unit to the hose given that the unit is contained and earthed thus giving the current a path to something metal I can touch in the shower.

Hi Wilko, The tingle is when I'm standing on a tiled floor near the shower.

Midwest, cheers again good advice of course but when I isolate the shower it's still giving this reading, also when I flick the switches in the CU no single circuit seems to be responsible for the voltage, as my sparky turned them of the voltage just slowly decreased.
It seems to be a few circuits combined that make a difference though, the three light circuits and one ring main although it isn't 100% clear.
If I turn off two of the lights on one lighting circuit the 2v goes to 1.9 but if I isolate that lighting circuit it stays on 1.9v

 

[Deleted member 26818]

Are you saying, that with other circuits switched off the voltage goes away?

 

[Kris Dor]

Yes for some, for instance if I just have the cooker and appliance ring on there seems to be no voltage on rad.

The 3 lighting circuits and Smoke detectors that seem to affect the reading are next to each other on the board but no single circuit kills the voltage.

If I turn off:
Lighting Upstairs
Lighting Upstairs
Smoke Detectors
Lighting Downstairs
Ring Main 1 (this has the spur for the shower)
The voltage reads 0.0v

the main ring circuit that seems to have an effect is not physically close on the board as it's RCCB protected (CU is Contactum split with some circuits not on the RCCB)

(Having said that I can only measure tenths of a volt on the multimeter so it could be 0.02v and my multimeter would read 0.0v)

 

[Midwest]

Hi Mhar, Thanks for your reply, no, the rad is copper all the way so part of the earth, the shower hose is Extraneous as you said the connector is plastic. since the unit is earthed and the rad is earthed and bonded to each other I guess the difference is because the voltage is making the hose conductive through the water. Since water is a bad conductor this would account for only 0.2v on the hose and 2v on the rad (or 2v and 12v after shower is run) I haven't and wouldn't be so mad as to connect an earth from the unit to the hose given that the unit is contained and earthed thus giving the current a path to something metal I can touch in the shower.

Hi Wilko, The tingle is when I'm standing on a tiled floor near the shower.

Midwest, cheers again good advice of course but when I isolate the shower it's still giving this reading, also when I flick the switches in the CU no single circuit seems to be responsible for the voltage, as my sparky turned them of the voltage just slowly decreased.
It seems to be a few circuits combined that make a difference though, the three light circuits and one ring main although it isn't 100% clear.
If I turn off two of the lights on one lighting circuit the 2v goes to 1.9 but if I isolate that lighting circuit it stays on 1.9v

I don't why I'm doing this, because your electrician should have an understanding of these phrases your using, but you may care to watch this video, and perhaps think again about your issue;

 

[Kris Dor]

Im sure he does, thanks for your time Midwest

 

[Kris Dor]

Thanks for the link too, all the best.