Emergency and standby power systems are designed to provide an alternate source of power if the normal source of power, typically the electric utility service, should fail. Reliability of these types of systems is critical and good design practices are essential. Think of it as the heart of your building's electrical system. Just as a heart receives blood and pumps it to various parts of the body, the distribution box receives the main electrical supply and. The distribution box (DB box) helps safely and efficiently distribute electrical power.