This comprehensive guide explores best practices for busbar insulator placement in electrical cabinet design, covering material selection, spacing requirements, thermal management considerations, and compliance with international standards. In low-voltage power distribution, the cabinet is never just a cabinet, and the busbar is never just a strip of copper. Ready to Design a Reliable Busbar System? A busbar is a metal bar, usually made of copper or aluminum, that carries. Busbar systems are the backbone of industrial low-voltage panels, switchboards, and distribution assemblies.