White, black, red, and green are the most common wire colors you'll see in a home — and blue wires must be treated with caution. Here's why.

Add Yahoo as a preferred source to see more of our stories on Google. Man working on wall switch wiring - Antonio_diaz/Getty Images If you're installing an energy-efficient ceiling fan or a new light ...

Man working on wall switch wiring - Antonio_diaz/Getty Images If you're installing an energy-efficient ceiling fan or a new light switch, you may consider doing the work yourself to save on labor ...