When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Color coding is really nothing new--radio component manufacturers started doing it in the 1920s.

First on the electrical wire color code is black. “Black wires are most used as ‘hot’ wires in residential systems,” says ...

OBJECTIVE: The responder shall identify the three possible colors of high-voltage electric cables and connectors within the engine compartment of a gasoline-electric hybrid vehicle. TASK: The rescue ...