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Wire ampacity depends on insulation temperature ratings, ambient heat, and whether conductors are bundled in sheaths or conduit. American Boat and Yacht Council (ABYC) Standard E11, Table 4A, dictates that 6-gauge wire with 105-degree insulation carries 120 amps outside an engine space but only 102 amps inside one.1:24 Bundling further reduces capacity; for example, multiple 6-gauge wires in a sheath drop to 84 amps outside an engine space and 71 amps inside.2:40 While these derating factors are critical for safety, voltage drop often limits wire length before thermal capacity limits are reached in typical mobile electrical systems.3:58 For stationary off-grid applications using solid-core Romex, the National Electric Code (NEC) Table 310.16 applies, requiring different derating calculations based on ambient temperature and bundle size.6:17 ABYC defines bundled wires as those bound for more than 24 inches, while the NEC threshold is 40 inches.7:19 Proper wire sizing requires consulting these specific tables rather than relying on general rules of thumb.

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