This single-phase supply has been divided into two circuits (i., light circuit and power circuit), and separate meters, as well as the main switches, have been installed within each flat of a large building. First, you need to know which circuits are in your building. Then, a connection of the sub-circuits is made with the sub-distribution boards or switchboard, wherefrom final sub-circuits or branch circuits are drawn for lamps, fans, sockets, etc. This is a fine, balanced, and. Example: Need a circuit for your 1,800W microwave? Calculator Tip: Tools like Desmos' scientific calculator make light work of conversions. Just plug in your wattage and voltage—let it handle the decimals. You're not just calculating numbers—you're designing a system that matches how you live. A distribution board (also known as panelboard, circuit breaker panel, breaker panel, circuit breaker, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit. This innovative design featured two double circuit breakers, eliminating the need for a separate instrument room. Its primary roles are distribution, protection (using devices like.