Design requirements for low voltage distribution boxes cover NEC, IEC, and safety standards to ensure reliable, compliant electrical installations. You must make safety your top priority when working with low voltage distribution boxes. It takes the incoming power and safely distributes it to different circuits throughout your building. The residential electrical code book is published by the National Fire Protection Agency (NFPA), which updates every three years. The new NEC revisions have been. Electrical systems power our homes, offices, and industrial facilities, but behind every reliable electrical setup lies a crucial component that often goes unnoticed: the distribution box. This panel acts as the heart.