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AC grounding on outboard-powered fiberglass sailboats is an unresolved safety question currently under active review by both ISO and ABYC standards bodies, according to Nigel Calder.▶ 1:01 The specific scenario: a sailor wants to add AC power to an outboard-equipped sailboat, use GFCI protection on all outlets, and leave the ground floating except when connected to shore power.▶ 0:34 Calder explains that when an outboard is raised out of the water, there is no designed connection to the water — the only path exists through the motor leg when it is submerged.▶ 1:13 Shore power grounding compounds the risk: the pin-and-sleeve connections at each end of a shore power cord corrode and fail regularly, making a compromised ground back to the dock common.▶ 2:05 If both the shore power ground and the water path are simultaneously absent, a person touching a live component on the boat becomes the fault-current path to ground.▶ 2:11 The keel-as-ground question is not directly resolved. Calder states plainly that no definitive answer exists yet because the standards are still being written.▶ 2:21

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