Some tips for marine electrical wiring include using stranded wire, using tinned wire and using crimp connectors to terminate electrical connections. Boat owners should only use wiring rated for marine use because the marine environment is much harsher than that on dry land.
Owners should select stranded wire when choosing wiring for their boats. Stranded wire is more flexible than solid wire and better endures the movement and motion experienced on a boat without breaking. Type 3 stranded wire is the most flexible and the best choice for boat use. In the marine environment, the most common cause of electrical failures is corrosion of the copper wire. A thin layer of tin on the wire strands combats the effects of corrosion and is worth the extra cost.
If a wiring fault occurs, it is most likely to happen at the end connections and not in the middle of the wire. To ensure the best connection, it is best to use a crimp connector instead of twisting bare wires together or wrapping them around a terminal. Depending on the type of terminal connection, a ring connector or a flanged spade connector is the best choice.
Electrical devices designed for household use, such as extension cables and power strips, should never be used in the marine environment. They do not have the proper water and oil resistance or the temperature rating for safe marine use.