Black wires can also be used as “switch legs” that connect wall switches outlets and appliances (like ceiling fans or lights), and become energized when the switch is turned on. Black wires should always be considered live, so taking proper safety precautions is important to avoid electrocution.

What Colour wire is the live wire?

WireColourLiveBrownNeutralBlueEarthYellow and Green

Is red or blue live?

Since around the 2000 United States presidential election, red states and blue states have referred to states of the United States whose voters predominantly choose either the Republican Party (red) or Democratic Party (blue) presidential and senatorial candidates.