Put SPDs at the main entrance, distribution panels, and near important equipment. This setup gives your building strong protection against surges. It is the main place where power gets sent to different areas. The box keeps. A distribution boxes acts as the load center and main distributor of electrical power within a building. A good spd layout helps panels deal with surge protection. 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.