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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

RE: Why would reversing AC leads reduce hum in a component?

Of course anyone opening the chassis without unplugging the unit first is an idiot

That may well true but, if the fault puts hazardous voltages on the case and the earthing is imperfect (as with, say, an elderly amplifier with loose, rusted earth connections in which a 25-year-old capacitor has just failed), you'd need to be pretty savvy to avoid getting a shock.

Besides, wiring regulations are there as much to protect the idiot as the expert. Which I think is a good thing because we all do idiotic things from time to time.

Well, I know I did in my career even though I used to remind myself that almost every line in the Regs (US, "code") had cost somebody's life.


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