In wires with very weak insulation (such as telecom and datacom wires having a foamed dielectric), the AC voltage ionizes the air inside the foam cells, reducing overall dielectric strength of the insulation.

• 绝缘较薄的电线(如具有发泡绝缘的通信和网络电缆)?交流电压使发泡单元里的空气电离?这将减少绝缘的介电强度。