Electrical wire has very convenient ways of telling you what it is. Most of the coding is standard, so with a little study, you'll be able to figure out what you have to work with. Wiring does not come in a variety of colors to make it look good. No, there is a wire color coding system that applies to most wires in your home. Most importantly, you need to know that the black, red, blue, and yellow wires are hot and green is often the ground.
Plastic boxes usually have spring-tabs for clamps and do not require tightening. Note: The ends of the individual wires should be clean, straight, and undamaged. Their insulation should be stripped 1/2 to 3/4 inch from the ends. Trim any damaged wires and/or strip insulation as needed, using wire strippers.
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