Selection of incoming lines for residential distribution boxes
1) Generally, the incoming line of power distribution box adopts five wire system, that is, a, B and C three-way phase line (the general color is yellow, green and red), one way zero line (the color is light blue) and one way ground line (the color is yellow with green. Think of the incoming line as the main artery bringing lifeblood to the entire system. Just like you wouldn't want a weak or clogged artery in your body, you don't want subpar incoming lines feeding your distribution box. The best distribution system is one that will, cost-effectively and safely, supply adequate electric service to both present and future probable loads—this section is intended to aid in selecting, designing and installing such a system. A distribution box, sometimes referred to as a panel board, distribution board, or breaker panel, is an essential part of electrical systems that makes it easier to distribute electricity throughout a structure.
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