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Via touching or rubbing or corrosion. 电气什么是selv和pelv？felv是什么意思保护特低电压pelv (protective extra low voltage, 缩写 pelv) ，只作为保护接地系统的安全特低电压用防护。安全特低电压 selv (safety extra low.

Insulation refers to a material that wraps around or covers an electrical element to protect the electrical element from the environment. 电介质；绝缘体 [网络] 介电质；介质 [专业] 介电 [电子、通信与自动控制技术]；介电 [化学]；介质 [物理学] insulation n.