This is not so.It is evident from the marketing material that I have studied that certain German SPD manufacturers infer or state that a service entrance requires a Class 1 tested device.

• 我从一些销售宣传资料中注意到，一些德国的SPD制造商指示或宣称在建筑物的进入端需要安装经过等级1测试的电涌防护器。