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

All true in the perfect world of today.

But what about two wire power cord and plug vintage audio equipment made before the polarized plug? The user has a 50/50 chance of plugging the plug into the receptacle so the equipment overcurrent fuse is on the hot conductor.

It should be mentioned on old 2 wire cord and plug equipment in the event of an overload the fuse is still in series with the load and will blow if the load exceeds the ampere rating of the fuse regardless if the fuse is on the hot or the neutral incoming power lines.

With a 3 wire power cord and 3 wire grounding type plug it could prove dangerous to the user as well as the equipment if the AC power polarity is reversed ahead of the fuse on equipment where the safety equipment ground from the wall receptacle is used.

What about the incorrectly wired wall receptacle where the hot and neutral wires are reversed?

What about the aftermarket power cord that has the hot and neutral reversed at the female IEC connector? This is more common than you would expect. Any one that buys non safety Listed aftermarket power cords should always test the cords to make sure the AC polarity is correct.

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