GB 50054-2011 第6.1.4条
| **** | The operating characteristics of the overload protection device shall satisfy: \( I_B \leq I_n \leq I_z \) and \( I_2 \leq 1.45 I_z \). Where: \( I_B \) is the design current of the circuit (e.g., a hotel guest room socket circuit calculated at 1.5 kW per circuit, approximately 6.8 A); \( I_n \) is the rated current of the protection device (e.g., 16 A); \( I_z \) is the permissible continuous current-carrying capacity of the conductor (e.g., 2.5 mm² copper conductor in conduit, approximately 20 A); \( I_2 \) is the current ensuring reliable operation of the protection device (for a circuit breaker, 1.3 times the setting value). |