On Mon, 18 Nov 2019 09:13:12 -0800 (PST), Tricky Dicky
wrote:

In my earlier post I mentioned my BCO insisted I fit a Surge Protection Device (SPD). The item arrived today and because the Surge Devices web site has some information but not the full install instructions, I have scanned the instructions in case anyone else was thinking about one and would like further information.

https://www.dropbox.com/s/a8nv5zyk29...anual.pdf?dl=0

Am I correct in understanding that such devices are in general terms
only required where there are overhead power lines between the
sub-station and the premises that could potentially be struck by
lightning?