AC cord polarity?? Does it matter???????

>>"I've just noticed that from experimenting with preterminated factory builty cords that not all companies use the same polarities. Even with two stock cords, one from USA made in China and one from China made in China for USA the polarity of the cords are reversed."<<
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Just one of the problems with after market power cables. Very few if any are UL listed.
http://www.marchansen.com/tn102/

Reversed AC polarity can cause noise and hum from your audio system as well as effecting it's sonics.

http://forum.audiogon.com/cgi-bin/fr.pl?htech&1014011751&openmine&zz

>>"Of course if you decide to use a balanced power unit, all this is of no concern."<<
[Nsgarch]
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Maybe, True if all the audio equipment connected by ics is pluged into the same balanced power unit.
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Nsgarch, What is your thoughts of feeding a balanced power unit from 120V? Jmho, I believe there would be better isolation if a balanced power unit was feed by 240 volt.

Here is some reading material. Make note of how the utility companies bond the high voltage neutral and all the secondary neutrals together at every utility transformer.
This can't be good for AC noise....
http://www.mikeholt.com/documents/strayvoltage/pdf/DangersofStrayVoltageandCurrent.pdf
Jmo it appears to me the only way to get total AC isolation is with an isolation transformer fed from 240 volt.
Jim

>>"Fifth, Mr. Holt does not mention, although I am sure he knows, that all power is generated and transmitted as three phase, each 120 degrees apart in time. When each phase has equal current, they sum to zero and there is no net current to flow through the ground. Any current is due to the three phases being unequal and will be small relative to the total current draw. If any significant power is disipated in the Earth, the power company loses money."<<
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>>"Mr. Holt does not mention"<<
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The article was not written by Mr. Holt.
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>>"When each phase has equal current, they sum to zero and there is no net current to flow through the ground."<<
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In my neighborhood there is only one 7200V HV line on top of the power pole, feeding many pole mounted transformers. Lets say for argument, (A) phase of the 3PH 4W 7200/13200V wye feeder leaving the substation. No balance here....Just one ungrounded 7200V conductor and the grounded conductor, the neutral (single phase).... No balance in the (B) phase neighborhood or even the (C) phase neighborhood. I will grant you at the point where the 3PH 4W HV feeder branched out going their separate ways, from that point where the neutrals were joined to the main feeder neutral, back to the subtation the HV neutral only carries back the unbalanced load plus*....
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http://www.ibiblio.org/obp/electricCircuits/AC/AC_10.html#xtocid269101