Is there a minimum length for power cords?

I like short ones. The 3 in my 2-channel system are between 20-24" each. You don't have to worry about them getting in the way ..... and they're cheaper :^ )

"However, any length shorter than 1.8 meters (5.9 feet)will begin to degrade the effectiveness of the shielding and filtering capabilities"

Sounds plausible to the layman I guess. If it's true it would then depend on how badly your set-up needed the shielding and filtering to begin with. This has been discussed in a similar thread here recently
http://forum.audiogon.com/cgi-bin/fr.pl?fcabl&1396218203&&&/Power-cord-length-

I would be curious to hear what other power cord manufacturers have to say about this? Could be true for one company but necessarily all of them.

Another manufacturer says no less than 3 feet. And some cable companies say that less than 8 feet is not ideal for speaker cables.

I think the manufacturers just want to sell us more wire.