Home Tweakers' Asylum

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

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

"why would reversing the feed to the primary winding of the power transformer cause a safety issue?

In and of itself, it wouldn't but, if performed - as is often recommended - by reversing polarity at the mains input rather at than the transformer input, it very likely means (at least in the UK) that the fuse is in the neutral line, not the hot.

Correct. We would want to reverse the leads feeding to the primary of the power transformer after the fuse so the "Hot" is always fused.

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