This International Standard establishes guidelines for the design, construction and installation of lightning-protection systems fitted on small craft of hull length up to 24 m. NOTE The probability of a lightning strike varies with geographic location and time of year, but when the conditions that create an electrical discharge between clouds and the earth exist, there is nothing that can be done to prevent the lightning discharge. Craft can be struck in open water or when tied to the dock. The presence of a lightning-protection system on a craft cannot provide complete protection from equipment damage or personal injury and such protection is not implied in this International Standard.