AC PWR cable to PWR Conditioner???

yes it certainly could help: some PLC makers (Chang Lightspeed for one) offer optional-upgrade heavier-gauge AC input cords on their conditioners. Theirs are hardwired & so must be ordered accordingly, or else sent back in for the upgrade. Other PLC's such as VansEvers have an IEC so you can install a cord of your own. I'm not sure about having an upgrade cord on the PLC's input & then more upgrade cords on the AC outputs to your components. You'd need to experiment to find the right combination, & the optimum cords likely wouldn't necessarily all be the same although they *might* be.
Using a single upgrade cord at the PLC input does not mean that you can get away with only stock cords on the outputs though, if that's what you're proposing.

I agree with Bob in terms of folks trying to "cheap out" by using a "hi-tech" power cord to feed the PLC and then use "stock" cords to all of the components. Even if the "good" cord and PLC minimize the incoming AC noise to an acceptable level, the stock cords still make excellent antennas for RF while radiating a magnetic field around them. Sean
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I played with this dilema just last week and had a sceptical but interested friend sitin . My old setup was a Tice AV solo conditioner with hardwired factory cord in standard wall outlet runing an integrated tube amp; transport and a Dac all with manufacturer standard cords. The 3 new variables were 3 new seperate dedicated lines; one PC lab cable 2; one PC mini lab cable. Experiment 1:Old setup ie Tice into house outlet vs old setup with Tice into dedicated line. Dedicated line gave marked improvement, lowering of the noise floor, greater sound stage. Experiment 2: PC lab cable 2 and mini lab cable between integrated amp and Tice vs directly into dedicated line. The PC lab cable 2 into the dedicated line won out with greater sound stage yet, improved bass, less noise. When both of the power cords were tried on the tice the sound stage got smaller and some of the detail was lost, piano sounded too soft, not enough crispness. Experiment 3: PC mini lab cable from Dac to Tice vs dedicated line. Dedicated line won out with a better overall balance and a less veiled, natural sound. Now I am hearing a lot more detail with the noise reduction and there is no fatigue. Hope this helps a little.

I just got a Blue Circle BC62 cord in the mail. I switched it first with the Vanevers cord in my Vansevers Ref83 conditioner and the improvement was immediate !! I moved it around to the amp instead and it was better in the conditioner. I guess it improves all the components put on the main.

So the answer like always is to try it yourself and take our comments for what they are (one man's/woman's opinion).

Tg Audio makes a $180 power cord designer just for this purpose, run a search for his product on this sight and check it out