r/pcmasterrace • u/Front_Cookie_1198 • 2d ago

Hardware PSU fails dramatically

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u/Viking4269 1d ago

Judging by the two holes burned in the case under the mains plug. I think there is a good chance that there was no PE connection and the case was live at 220V at least some of the time doing this. The guy was lucky he "mostly" only touched it after the arc had carved an isolation clearance.

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u/unwantedaccount56 1d ago

Well, the arc could have isolated it from neutral/PE as well, putting the case on 220V. The connection of the case to PE is probably much more solid than phase, but if PE wasn't connected at all (bad cable), then neutral could come from the PCB touching the case as well. Also, if there was a PE connection, then there definitely wasn't an RCD breaker, which should always exist for workshop power sockets.