----- Original Message -----
From: "Can2002" can2002@nospammailDOTnet
Newsgroups: uk.d-i-y
Sent: Saturday, May 08, 2004 10:44 PM
Subject: Lights dimming


Following my last post I tried measuring my voltage with more high power
devices attached (both showers, over, microwave & kettle) and this time
the
voltage dropped to around 215-216V.

I rang EDF energy again and they sent someone out yesterday afternoon.
Strangley all he did was disconnect the main fuse and measure the voltage
coming in to the meter, which was 247V. He drew a conclusion from this
that
their line was OK and it must be my wiring!! When I pointed out that when
I
measured the voltage with minimal load it showed 247V too, and that it was
only when under load that the voltage dropped, he basically shrugged his
shoulders. The only suggestion he could make was that the high and low
power devices must be running off the same MCB, but I've already confirmed
this is not the case.

I'm not sure what they're going to do next, but it basically seems as
though
some link between the substation and my internal wiring has higher
resistance. Earlier postings from others seem to suggest it's the supply
to
my house, but I guess I should try to test the resistance between the main
isolator and my consumer unit. Does this sound like a reasonable idea?

Cheers,
Chris


I'd insist (as best you can) that they install a recorder to monitor your
supply voltage over a period of time.

From your previous comments (fan heater, oven) I'd say you're looking at a
supply impedence of between 0.4 and 0.8 ohms. I'd consider this "on the
high side" and be concerned therefore about any impact on the earth loop
impedence. If your report highlighted any earthing issues I'd hope that
they've been remedied.

I'd not be surprised if your supplier didn't want to do much about this volt
drop! What actual problem does it cause you?

JR