Please see attached table from DPWH Standard Spec 1109, Philippines.
That's their recommendations for a reliable ground cabling size for lightning protection of masts and constructions.
Myles, I guess that your jumper cable is not that size.
So your cable might only guide some of the lightning power away.
The remaining power will surely find another way, thus burning off your electronics, batteries, etc.
On Wednesday, 9 December 2020, 03:56:41 GMT+8, Myles Twete <matwete@comcast.net> wrote:
I have a jumper cable onboard…easy to throw one end overboard on that rare 1x/3yrs that I'm out on my boat, outside the covered marina in an active storm. J
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