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/diy/ - Do-It-Yourself


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>> No.1510014 [View]
File: 44 KB, 470x353, power-transformer-failure.jpg [View same] [iqdb] [saucenao] [google] [report]

Consider a 230V transformer with whatever voltage on secondary. The core is connected to the earth wire as per regulations.
If primary insulation fails and touches the core, fault current starts to flow and trips the breaker. So far so good.
But what if secondary fails, but not primary, so the earth wire suddenly becomes an open circuit under voltage? Won't every piece of earthed equipment in your home become live? I mean, with 12V on secondary it's not that big a deal and nothing would happen until you provided a return path to the secondary anyway, but still, how do you protect yourself from that kind of situation?

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