Choose the right box based on environment (indoor/outdoor), load capacity, and durability. Check for proper IP/NEMA ratings and material quality. In this guide, we'll break down everything you need to know to install a distribution box correctly and confidently. Ensure safe placement: install in. In this article, we will briefly outline the seven most important points for the choice of distribution boxes based on actual needs, professional standards, and purchasing experience, so you can make smart and practical decisions. Metal shell: mainly cold-rolled steel plate, with high strength and. A distribution box, sometimes referred to as a panel board, distribution board, or breaker panel, is an essential part of electrical systems that makes it easier to distribute electricity throughout a structure.