GB 50057-2010 第4.2.1条
| **** | **Air-termination system layout**: For a Class II lightning protection hotel building, the rolling sphere radius \( h_r \) of the air-termination system is **45m**; for a Class III lightning protection hotel building, the rolling sphere radius \( h_r \) is **60m**. Air-termination mesh size: Class II no greater than **10m×10m** or **12m×8m**; Class III no greater than **20m×20m** or **24m×16m**. |