John Rumm wrote:
Bramble-Stick wrote:

I've noticed that when I run the shower (gainsborough energy 2000),
the bathroom light dims slightly then brightens when its switched off.
It has always done this, but I just wondered if this is normal?


Chances are it is probably normal. Showers place a very high current
load on the supply, which will in effect try to pull the voltage down a
bit. The more resistance there is in the wires supplying your property,
the more noticeable the voltage drop. Ordinary filament bulbs tend to
show up even quite small voltages changes as a change in brightness -
most noticeable when it is a big load that switched on or off.

(with our relatively "floppy" supply via overhead lines, even a 3kW
kettle will dim the lights a little)

and lights on a dimmer are evn more sensitive - you don't just get a
lower voltage but for a shorter duty cycle as well.

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