What is the minimum cross-sectional area required for the internal bonding bus of a multisection switchboard?

The minimum cross-sectional area required for the internal bonding bus of a multisection switchboard is established to ensure adequate conductivity and safety. A cross-sectional area of 1/2 square inch is designed to handle the safe distribution of electrical current and minimize overheating due to resistance. This size reflects industry standards and code requirements, which aim to maintain performance while preventing potential hazards associated with under-sized conductors, such as excessive voltage drop or overheating.

In multisection switchboards, the bonding bus plays a crucial role in ensuring that all electrical sections are properly grounded and that fault currents can be safely directed. The specifications set forth in the National Electrical Code (NEC) and local regulations underlie this requirement, emphasizing the need for reliable grounding connections to enhance system stability and safety.