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mast), it is not to be expected that lightning strikes them. Ad-
equate surge protective devices are shown in Figure 9.34.5. L
The effects of induced surges and switching overvoltages
caused by board generators and UPS systems must also be N shore SDB yacht
observed. In this case, it is advisable to use type 2 surge arrest-
ers in the distribution board (Figure 9.34.6). PE

Personal protection
The equipotential bonding measures for all connections listed
in the above “Equipotential bonding” chapter reduce the risk EBB
for persons on the yacht. In the event of a thunderstorm, per-
sons should therefore earth plate / body
¨ Not stay on deck since potential differences, which present
a risk in conjunction with wet skin, can occur due to wet Surge protective device Part No.
surfaces DEHNventil DV M TN 255 951 200
¨ Not touch shrouds, rods or other metal objects DEHNgap DGP M 255 961 101
¨ Check the lightning protection system at regular intervals Figure 9.34.6 Detailed view of the shoreside power supply system
and do not wait until thunderstorm occurs. In this context, with a lightning current carrying type 1 combined
it is important to check whether the equipotential bond- arrester
ing system, namely the connection of all conductive metal
devices on board to the lightning protection system, is in
good order and condition.
More detailed information can be found in the “Blitzschutz für
Yachten” [Lightning protection for yachts ] book by Michael
Hermann, Palstek Verlag, Hamburg, 2011 (German).

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