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US shore power systems utilize 240-volt circuits configured as two 120-volt legs that are 180 degrees out of phase.0:45 This split-phase arrangement allows for 240 volts between the two hot legs.1:07 When connecting to shore power pedestals, sailors can determine if two 120-volt outlets are in phase or out of phase by measuring the voltage between the hot terminals.1:18 A reading of zero volts indicates the circuits are in phase, while 240 volts confirms they are 180 degrees out of phase.2:04 Attempting to combine these circuits manually poses significant safety risks, including the potential for back-feeding.3:06 Specialized adapters equipped with integrated test circuitry safely manage these connections by verifying phase alignment before completing the circuit.2:56 While 120-volt systems require heavier wiring than European 230-volt systems, they offer a higher margin of safety in the event of accidental contact.3:28 Proper testing and troubleshooting of AC electrical systems require a multimeter and a thorough understanding of circuit safety.4:07

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