On Mon, 19 Mar 2018 10:50:39 +0000, Brian Gaff wrote:
Its clearly daft as obviously, a fire in the electricity cupboard may
well cut the supply.
The mains interlinked ones usually have a backup battery. Our Firex ones
do.
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Use the BIG mirror service in the UK:
http://www.mirrorservice.org
*lightning surge protection* - a w_tom conductor