On Tuesday, 5 February 2019 11:30:17 UTC, Adrian Caspersz wrote:

That fire risk was related to the story of surge supressors being used
on a boat, where electrics could be done different - earth found
floating halfway between live and neutral, that would place a constant
voltage across the device, and a constant source of heat (and risk).

Inland it is not a worry - heat only occurs when a surge is absorbed.

Why would having the earth floating between live and neutral be worse than
the usual "inland" situation where one or other of the common mode surge
suppressors will usually have the full mains voltage across it?
It should make no difference at all for suppressors between live and neutral.
John