GB 50057-2010 第4.5.1条
| **** | **Side-flash lightning protection**: For a Class II lightning protection hotel building exceeding **30m** in height, a horizontal air-termination conductor shall be installed around the building perimeter at every floor starting from **30m**, with structural ring beam reinforcement used as the equipotential ring. For a Class III lightning protection hotel building exceeding **60m** in height, installation shall start from **60m**. |