It's common sense that electricity can be dangerous. Nothing increases the risk of electrocution like poor wiring. Whether it's a failure to properly ground a circuit or just a faulty or mistakenly attached wire, not knowing your way around electrical systems can be a recipe for disaster during a DIY project.
According to studies by the Center for Injury Sciences, electrocution is the fifth-leading cause of occupational deaths. Bad wiring is the cause of more than one third of electrical fires.
Arm yourself with knowledge before starting on an electrical project. Start with this quick guide to wire coloring - it can make the difference between a professional job and a total mess.