Join Date: Dec 2002
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Rep Power: 11
Something that looks like a fuse
I''m still confused as to this device''s function.
Is it something like a Metal Oxide Varister (MOV) that only conducts at high voltages; thereby establishing a path to ground for (above threshold) lightning energy?
I knew I should stay "out" of this one - too complex to cover properly - BUT ...
The research (I''ve seen) FAILS to indicate that "Early Streamer (Ion) Dissipators" reduce the incidence of lightning strikes on land-based tall structures. The ground path DOES mitigate the dammage caused by lightning strikes.
For 2 good articles see:
IEEE Transactions on Power Delivery, Vol. 13, No 4, October 1998 (Abdul M. Mousa)
IEEE Transactions on Electromagnetic Compatibility, Vol. 33, No. 2, May 1991 (Ewan M. Thomson)
It would take thousands of words to describe the actual installation; but (in reply to yours):
45 degree change in direction: Straight conductors (to ground) are preferred; but a 90 deg. bend with a minimum radius of 8" can be accommodated.
Chain around a shroud: The (minimum #6 AWG copper)ground connection to (salt) water should present a minimum of 1 square foot of surface to the water - more is preferable, especially in fresh water. Would, rather suggest connecting a #6 AWG cable to a (min.) 1 square foot x 1/4" ground plate. This could be clamped to the bow chain plate (further from occupants),
Your concerns ("blowing a hole in boat) are well founded, and not simply addressed.
NFPA guidlines are under current review, and mostly address methodes of dammage mitigation, not prevention (which I, and others, believe to be impossible).
Witchcraft? You bet!
Thanks for all the good information & opinion from all.