what is DB box in electrical
as mentioned earlier an electrical panel is also called an electrical distribution board DB box. it is an enclosed steel box that basically houses various circuit breakers and other electrical components that maintain the power supply in your home.
what is a three phase line
In electrical engineering three phase electric power systems have at least three conductors carrying alternating current voltages that are offset in time by one third of the period. A three phase system may be arranged in delta or star Y also denoted as way in some areas.

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