Voltage on PME

[DaveyD]

Hi

Just investigating a tingle - on our own utility sink! Its a TNC-S system, all circuits check out, bonding to utilities new and good and checks out OK, check earth contuinity on all appliances. Tingle still there when all circuits de-energised for over half and hour. ZE = 0.20 but has a voltage of 10v through me at the sink, that's without shoes on a slate floor. Can anyone help?
TIA
Regards, David

 

[johnboy6083]

is it on any other properties in the area? whats your live to earth voltage with installation isolated, and main earth disconnected?

 

[malcolmsanford]

Could be a neutral breaking down somewhere in the installation or even external.

I would have said if your measuring with a digital meter you could be geting a "phantom Voltage"

 

[DaveyD]

Could be a neutral breaking down somewhere in the installation or even external.

I would have said if your measuring with a digital meter you could be geting a "phantom Voltage"

Yes it's a fluke 1651 but just re calabrated and a decent set of new kewtec leads. When I wear rubber shoes the volts drop to 1.2.

 

[DaveyD]

whats your live to earth voltage with installation isolated, and main earth disconnected?

All power off from supply isolator side :: Line to PME 2.3v
CU, off but power from supply side :: Line to PME 238.

 

[malcolmsanford]

Sorry Davey just re-read your post and your geting it off a sink I see, which in all honesty most likely rules out phantom voltage as this is a capacitance occurance.

It would seem you may have a neutral breaking down somewhere either in your installation or external. Though with the bonding in place as you say you should not be introducing a potential from outside.

 

[DaveyD]

It would seem you may have a neutral breaking down somewhere either in your installation or external. Though with the bonding in place as you say you should not be introducing a potential from outside.

It's Saturday so please excuse my brain, can you please help me comprehend how this is so if all power is off? TIA

 

[malcolmsanford]

Have you any inductive loads in the installation that are class II appliances?

 

[DaveyD]

Have you any inductive loads in the installation that are class II appliances?

Only inductive are a WC fan (NOT ELV) and a shower fan, the same.

 

[davelerave]

if it's the DNO neutral

you should notice it on other exposed/extraneous metalwork

a simple check for voltage drop might indicate that problem

there should be no tingle with main switch off-in that case

 

[DaveyD]

if it's the DNO neutral

you should notice it on other exposed/extraneous metalwork

a simple check for voltage drop might indicate that problem

there should be no tingle with main switch off-in that case

Thanks 235v dropping to 220v with shower on.

 

[DaveyD]

That's interesting, thank you. Does that account for the voltage I'm getting between line and PE ? (As above)

 

[DaveyD]

Genius! Thanks Chris. Your theory is good. Will rod it Monday and let you all know.

 

[Chr!s]

It can be quite common, especially wet rooms etc where there may be bonded pipes etc and tiled floors, hope you sort it.

 

[DaveyD]

Did you remove your previous post Chris?