Ancor 16/2 Safety Duplex Cable - 500' [124750]16 2 Safety Duplex Cable 500' Features red and yellow Marine Grade primary conductors in a white common jacket. ANCOR recommends yellow wire as DC negative because black is the standard color for AC hot. There have been many cases of people working on their DC systems who have inadvertently cut the live AC wire. Because of the wide spread use of inverters, power generators and shore power connections, even today? s smallest boats pose a risk of