There are multiple wires because that is how wires are connected to gather to get from the distribution box to the farthest outlet on the circuit. If a problem like a short circuit or overload occurs, the circuit breakers will cut off the power to stop damage or fire hazards. Single Phase Distribution Box generally consists of Double Pole MCBs, Single Pole MCBs, and RCCBs. It helps control and distribute electricity to different areas. How many. A distribution box is a low-voltage electrical enclosure that receives incoming power and distributes it safely to multiple outgoing circuits through protective and switching devices such as MCBs, RCDs, RCBOs, fuses, isolators, busbars, neutral bars, earth bars, and surge protective devices.