Broadly however a Class 1 test would be performed on a crowbar type of device, an arrestor, as opposed to a suppressor, due to the extremely high coulomb ratings specified in 61643-1.

• 然而通常来说，等级1测试的情况只会发生在那些急剧短路型的设备上，或是避雷放电器(arrestor)上，而不是抑制器(suppressor)上，这是由于61643-1标准中要求的极高等量的库伦值的原因。