Voltage in shower waste!

[LittleHelper]

Could it not be an induced voltage with cables running near pipework?

 

[Tridentsystems]

Looks like purple abandoned us for the IET forum

 

[KAS1]

I agree, it's also in full flow on the IET forum lol

 

[snowhead]

Could it not be an induced voltage with cables running near pipework?

Causing an induced shock?

 

[ArseyDee]

Looks like purple abandoned us for the IET forum

What? A defection by the OP?

The voltage is not always leaner on the other side you know!

Sorry, that's a pathetic attempt at humour on my part.

 

[purplemaf]

Lol sorry people! I've not abandoned you honest! Just getting as much info as pos. If you've not seen yet then I'll enlighten you.

Today I found 25v on the metal studwork in 2 seperate places oon the 1st floor. Appeared to be directly energized by the lighting circuit. However once the lighting circuit was completely removed the other circuits combined brought back 7v. Af least now I have metal to test to instead of water! To experiment I put a bond to the metal work in one room which removed the 7v however it remained in another room. So this does explain why problem is upstairs only as the 2 floors are not connected with metal stud. Hunting on...

 

[purplemaf]

Very grateful for all the assistance so far.

 

[Phoenix]

Cable run through metalwork with no grommets? Only a thought...

 

[brman]

so let me get this straight.....

we have random voltages to metalwork and pipework throughtout the building. Bonding some bits doesn't affect other bits and it all depends on the load on multiple circuits?

Do I recall right this is a PME system?


Have we really ruled out the MET floating relative to the true mass of the eath?
Was it ever tested against a earth spike (not connected to anything else) with load on all the circuits? I got the impression it was but was confused what the results were........

 

[Lucien Nunes]

It was implied that the DNO had done such a test but I did re-ask the question and so far no explicit answers have been given. I was trying to rule it out but agree that we can't yet do so. However we do have numerical answers for insulation resistance that include some strange failures.