AS I mainly do commercial work .
With domestic, can any one explain Why does a metal kitchen sink/draining board not need supplementary bonding as opposed to a metal part in a bathroom,
Reason I ask
Someone told me they occasionally get shocks from the washing machine with Moulded Plug (earth continuity ok to casing) and it is worse if they also touch metal draining board (copper pipes , plastic waste) at the same time.
I realise they have a problem that needs sorting out,
But they seem to think it just needs bonding.
I disagreed and said kitchen does not have to be bonded.
They asked WHY?
As the main bond has not been located or verified
would bonding make the present situation worse , as I think It might.
The supply is pme
With the entire house all unplugged
The actual ring circuit including the washing machine point has low insulation resistance L to N of approx 1.5 megohms But L-E and N-E are in excess of 100megohms.E loop imp is 0.72ohms at the W/Machine point
This obviously needs investigating.
But could that put a voltage into the system earth causing there problem.
For my reference.
What is most likely, a problem with voltage in the electrical earthing or with some sort of voltage in the copper piping.
There is no visible main bond on the water and are in the process of organizing having a periodic inspection.