Marine Wire Size and Ampacity | West Marine Aug 08, 2019Marine Wire Size and Ampacity. By Tom Burden, Last updated: 8/8/2019. Marine grade wire is manufactured in multiple gauges for different applications. Use the charts below to determine the correct wire gauge, based on the amount of current in the circuit and the length of the wire run. Safe AC-Electrical Wiring Aboard | Cruising World Jul 12, 2012Safe AC-Electrical Wiring Aboard. Electrical grounding systems may not seem fun, but the price of overlooking them can be too high to pay. By Ed Sherman. July 12, 2012. Read Comments. More How To. 2020 Harley-Davidson LiveWire Electric First Ride. Read More. 2020 Harley-Davidson LiveWire Electric First Ride. Latest.