Extra Phun Org Explained: What They Don’t Want You To Know Dont About 87 5

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.

Stuff They Don't Want You to Know By Ben Bowlin, Matt Frederick, Noel

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