He looked at the generic breakers. "The label on these just says 'High Capacity.' That means nothing. IEC 60947-2 demands they mark the rated short-circuit breaking capacity in kA. Without that number, calculated from the fault current study of this building, I’m flying blind."
IEC 60947-2 is a standard published by the International Electrotechnical Commission (IEC) that specifies requirements for circuit-breakers, including their design, testing, and performance. The standard covers low-voltage circuit-breakers with a rated voltage not exceeding 1000 V AC or 1500 V DC. iec 60947-2 pdf
IEC 60947-2 an international standard established by the International Electrotechnical Commission (IEC) that specifically governs the requirements for low-voltage circuit breakers He looked at the generic breakers
Need the latest version? Visit the IEC webstore and search "IEC 60947-2:2024". Without that number, calculated from the fault current
IEC 60947-2 offers several benefits to manufacturers, users, and regulatory bodies: