Wire Gauge

Wire gauge is the size of electrical conductor used in a boat’s DC or AC wiring, commonly specified as AWG or by cross-sectional area in mm². In marine systems, gauge determines how much current a wire can safely carry over a given distance while limiting voltage drop to equipment.

Correct gauge is critical because long cable runs, high loads, and damp, salty conditions increase risk. Undersized wiring can overheat, trip breakers, dim Navigation Lights, slow a Bilge Pump, or reduce performance of a VHF Radio; oversized wiring adds cost, weight, and installation difficulty.

When selecting wire gauge, consider current draw, circuit length, allowable voltage drop, insulation rating, and whether the cable is tinned marine-grade copper. Reliable wiring also supports onboard networks and devices such as DataHub, helping maintain dependable GPS, NMEA, and connectivity data at sea.