Busbar choice sets thermal margin, fault survival, voltage drop, joint reliability, and future expandability for the whole assembly. A good design balances rated current, prospective short-circuit current, temperature rise, spacing, insulation coordination, corrosion. IEC 61439 is a standard developed by the International Electrotechnical Commission (IEC) that covers design verification for low-voltage electrical products and assemblies. This standard defines the design verification, test requirements, and thermal performance of the assemblies.
