Inside a distribution box are components like circuit breakers, earth leakage units, doorbells, and timers. The building's electrical power enters through the main feeding cable, which connects to the distribution board. Laterals can be directly connected to main trunks, but are more commonly protected by protective devices such as fuses, re-closers, or automatic sectionalizers. Overhead laterals use pole-mounted distribution transformers to serve customers and underground laterals use pad mount transformers. It is a vital part and central hub of any electrical system. From there, the power is distributed through the breakers to secondary. This ultimate guide explains what a distribution box does, its internal components, common types, real-world applications, and how to select the right DB Box for your project.
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