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ARW

On 01/04/2018 19:36, wrote:
On Sunday, 1 April 2018 19:31:15 UTC+1, ARW wrote:
On 01/04/2018 19:23, tabbypurr wrote:
On Sunday, 1 April 2018 18:15:29 UTC+1, Steve wrote:

I had a call a few weeks ago where the customer said he'd been taking
meter readings and he was losing about £10 of electricity a day. He
thought it was something to do with his boiler as sometimes he had some
warm water coming out of the cold tap. Sounded like a sensible bloke,
even though what he was saying was a bit odd, so I went for a look.

Supply was nominally a TT (no sign of a rod) with an old Wylex
rewireable box. Clamp meter on + tail 10.5A, clamp meter on - tail
0.5A. Pulled the fuses an found the current was flowing in the ring. A
quick look around found a socket with a very hot screw - the live had
been nicked by the screw and was providing a nice 24 ohm earth path to
the incoming lead water main. An expensive way to heat the water in the
first few feet of lead pipe and lucky not to have had a fire.

can we put that on the diy wiki?

Before or after homeownershub post it with replies in 2020, 2023 and 2525?

Only 7 years? They've done better than that many a time.

New blood here is no bad thing, but for some reason the hohers are seldom capable of anything.

:-)

Yes it ought to go into the wiki. It's also something I have encountered
a few times.

1. A garage fed from a 20A MCB with SWA from a non RCD side of a TT
supply CU (not even the 100mA RCD main switch protection that is the
minimum that ALL TT supplies are required to have on all circuits).

Rats ate the fridge freezer supply cord in the garage and created a SC
that caused a 10A earth fault back up to the CU. Big electricity bill.

2. A TN supply but the TN earth was not connected (making it a TT
supply) and there was also not any main equipotential bonding. The only
earth was from the buried pyro to the garage. Owner got a belt from the
cold tap. I earthed the TN supply and destroyed the damaged pyro when I
switched that circuit back on.

--
Adam