Knowing your electrical load is the first step to pick your panel size. Add up the total power needed for your home or building. This means checking the wattage of all devices and appliances. For example, refrigerators, air conditioners, and lights add to the total load. But with some simple math and planning (don't worry, we'll walk through it!), you can design a system that works smoothly even when you're running all the gadgets. This is because accurately determining the size of main panels and load center ensures they can safely and. Choosing the right distribution board size is important for your electrical system's safety and efficiency. Power Supply is 430V (P-P), 230 (P-N), 50Hz. 6 for Non Continuous Load & 1 for Continuous Load for Each Equipment. Branch Circuit-1: 4 No of 1Phase. When the electric box is only a lighting electric box or a small power, and the incoming line is less than 10 square, if the number of switch digits is less than 20, the width of the switch is added and 20mm on each side is the width of the electric box, and the height is the switch height Add. A distribution box, also known as a distribution board, electrical panel, or breaker box, is an enclosure that houses electrical components responsible for distributing electricity throughout a building.