GB 50054-2011 第6.4.2条
| **** | For hotel distribution trunk lines longer than 50 m (e.g., cables from the substation to the top-floor equipment level), verify whether the end-of-line short-circuit current meets the sensitive tripping requirements of the protective device, i.e., the minimum short-circuit current should be no less than 1.3 times the instantaneous trip setting current of the protective device (for circuit breakers) or 4–7 times the rated current of the fuse link (for gG fuses). |