On this topic i actually have a sound ideal here.
Worse is Better lol. Believe it or not. Now ye shall receive one of my patented dumb lectures.
Taking into assumption that you don't need a shield and have little or no radiated EMI or RFI. Being the inventive student i was, generally bored, and the kind that likes to push buttons for no apparent reason, i did some research using a time domain reflectometer and agilent power meter using 50 ohm matched souce/load combo, signal came from a really expensive Rohde and Schwartz i would love to steal.
I can't do anymore request tests as the lec that let me do this, Mr Varnes took a 1 sem holiday, that old coot. Nonetheless the results from this one are interesting.
We consider 2 cables, 1 a standard RG58 and another is a Thin Lan Silver plated Cable made by Huber Suhner
Results = Nothing out of the ordinary, the Suhner cable beat the shit out of the nameless RG58, by a good 30-40 percent marging in attenuation up till 500Mhz and after that it went up to 100 percent.
But it did get me thinking. Attenuation at specific bandwidths might be useful, it's a just a bad thing made good by using it in a place where it can help. Attenuation at 60Hz was obviously so small it didn't matter, generally only after jumping to 1Mhz did i see the difference between cables. But what about the rest of the range? All those megahertz must mean something right?
Haha, that's where it all came in.
What do we want from a good power cable?
1) For it to deliver power at a given frequency with the lowest attenuation.
At 60Hz, this doesn't matter, both mathematically and practical test wise, as long as you have a cable that can carry the current, it should never matter)
2) For it NOT to deliver any power at any frequency aside from from the fundemental.
You see, as the frequency rises, the crap cable generally puts up more of a fight to the signal than a good one. This is bad in RF applications, but when all you want is 60Hz, then the reduction of all the junk high frequency signals that travel along the cable is awesome. Awesome Possum.
A good cable generally tries to model a pefect transmission line as closely as possible, a bad cable doesn't. A bad cable has higher levels of resistance, capacitance and inductance, although unwanted in the signal domain, in the power delivery domain, it acts as a low pass filter that filters out crap before it reaches your PSU.
Conslusion/TL/DR : Cheap and crappy cable is potentially far better than expensive cable. As long as your cable is shielded, a crappy cable should always beat a good one when used as a power cable. Yay.
Someone blanja me when i come back in December ya?
It sounds like one needs to be an engineer to enjoy the music ( sorry, I am from financial school ).
For me, Volex is better than pc power cord, as Chua said. I have one of Volex.
I do agree that expensive power cords are poisonous , so it is better not to touch.
Sorry, No intention to flame you.