Originally Posted by Blue Jay
Never heard of such a thing, unless you are off grid and using battery power there is NO polarity. Alternating current is what comes from the power company, yes it changes from positive to negitive at the rate of 60 times a second (here in the US) that is where we get the term AC. We have a hot side and a neutral side and a light bulb could care less which side is which, so the safety aspect is the only thing to be concerned with.
Technically you are correct but, with that being said, can you explain to us polarized AC outlets and plugs?