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Jan Attenstedt and Nigel Calder define the sizing requirements for three distinct grounding conductors on a boat: the AC grounding circuit, the DC negative-to-grounding bus connection, and the grounding bus-to-water connection.0:32 The AC grounding wire typically matches the gauge of the existing AC circuit, usually 10 or 12 gauge in American systems.0:48 The connection from battery negative to the grounding bus must accommodate the highest potential fault current from heavy-duty equipment like a windlass or bow thruster, often requiring a cable size equivalent to the main negative battery cable.1:04 For the connection between the grounding bus and the water, the minimum size depends on the function: 8 gauge for general bonding and corrosion prevention, 6 gauge for lightning protection, and 4 gauge for the primary lightning rod conductor.1:50 Undersized conductors risk melting during a high-current fault.2:36 Proper sizing requires evaluating the worst-case fault current for each specific circuit to ensure the conductor can handle the load safely.2:36

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