我县某单位向我局反映：某用电线路电压突然升高，造成７台微机、４台空调器烧坏。 我们对烧坏的微机和空调进行了检查，烧坏原因是过电压导致。当时我们对产生过电压的原因进行了分析：一、接线错误（有两根相线进入微机室）；二、公用零线断线或老化（接触不良）。根据以上分 A unit of our county reflects to our bureau: Sudden increase of the voltage of a certain electricity line, causing 7 computers and 4 air conditioners to burn out. We checked the computer and air conditioner that had been burned out, the reason of burnout was caused by over voltage. At that time, we analyzed the causes of overvoltage: First, the wiring error (there are two lines into the computer room); Second, the public zero line disconnection or aging (poor contact). According to the above points