Can anyone advise on the following situation.
My sister inherited a house from her father-in-law about 3 years ago
and is know experiencing some strange faults with the plumbing and
First indications was when the hot water tank started to leek, when we
looked at this we found that it had completely rotted. After we
replaced the tank other leeks started to appear throughout the cold
water and central heating pipe work, all on the ground floor close to
external / sleeper walls. She called in several plumbers who fixed the
leeks as they appeared only for another to appear a week later. All
the plumbers indicated that this was due to the pipes not being lagged
and the acid in the lime mortar causing corrosion, although we thought
that this was strange because her father-in-law had never had a water
leek in all the years he lived at the property. After much
deliberation she bit the bullet and had a complete new boiler, heating
and plumbing system installed with every bit of pipe work replaced and
lagged at great expense.
Now three months on the leeks have started again, the brand new copper
pipworks look like it is 20 years old and full of pinhole leeks and
corrosion. I decided to take a trip over to her house and do some more
investigation on the electrical installation with the following
First check was to see if the earth bonding was correct. This was
installed although not to the current size for a PME system.
Next was a Earth Loop Impedance, this came up as 400 ohm on the socket
that indicated that there was a major fault, this was checked again at
the main earth block and again showed a Very High impedance. We called
in the supplier to check out the system and he found that the earth
strap in the head end was loose, he tightened this up and left without
any further tests etc. The earth impedance is now .2 ohms.
My Question / Worry now is that there may still be a fault on the
installation as I cant see how a faulty /
no earth on the incoming
supply would put a high current through the earth bonding and
associated pipe work to cause the damage to the copper pipe work.
Other tests carried out
Incoming cable is a 2 core 32 mm I think
PAT tested all appliances, all OK
Incoming mains water is Plastic
When a tap is left dripping it leave a blue stain.
A new electronic metre was fitted a while back, this has doubled the
elec bills from previous meter and may have something to do with the
I have fitted a new consumer unit with RCD on all ground sockets,
shower etc without any tripping
Any advice on how to check for neutral faults / any other faults would
be appreciated and an explanation on how the earth fault would cause
these problems would be greatly appreciated.