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If bunches of related equipment, say computers & attached (USB, Firewire, DVI-D, etc.. ) accessories, all use polarized wiring, then their PSU's will be in phase and maybe that means they'll have lower interference/emissions or some such thing -- pure speculation on my part.

It would be interesting to know if there is any truth to this one. If so, I would consider it critical for the equipment in my basement recording studio.

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People are thus far less likely to accidently burn/electrocute themselves when changing bulbs.

So you're saying that touching one of the prongs will electrocute me, while touching another prong would be harmless?

How is that possible in an ungrounded AC system?
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Tony Fabris