On Wed, 23 Oct 2013 23:20:47 +0100, Stephen wrote:

boiler & immersion

Hum, so if a leakage fault develops in the immersion (fairly common)
it trips off the heating... Remember N-E faults can trip and RCD,
though I guess the immersion switch will be DP. Still makes it harder
to work on one or the other independantly though.

--
Cheers
Dave.