We have used a lot of these power supplies with the M12 they are very good but we made our own DC and Alarm cables up because the ones supplied by Cisco were over engineered I have piles of them here still in boxes!
I think the CSCO-PWR-CBL-NA1 has a NEMA 5-15P Style Plug and the CSCO-PWR-CBL-NA2 has a NEMA 6-20P Style Plug, both these cables are hard wired into the PSU so only have a plug on one end, think they are over 3 meters long.
Sorry don't know about the other two part numbers think they are for the M6 chassis which dont need external PSU as they have integral AC PSU but at a guess they will have the same plugs on as the other ones above .
Make sure you install all four mains leads even if you are only using 2 rectifiers to start with because to add them later means removing the whole PSU from the rack and invariably will mean a full outage
Just found this in the hardware install guide for the M6 chassis:
http://www.cisco.com/en/US/docs/optical/hardware/15454install/guide/hig_15454M6.html#wp542382
Go to DLP-G571 Connect Office Power (AC) to ONS 15454 M6 Shelf
Then scroll down a bit to Figures 5-39, 5-40 & 5-41 which shows the connector at the M6 end.
If you download the pdf its on page 333.
Check out the table 5-1 PIDs for AC Cables on page 335 as well.
