Hello Keith.
I have successfully been running Masterlink through CAT6 STP using the Lexcom products. They also offer the same support for Powerlink – so without my own experience with Powerlink, a would be surprised if i doesn’t work.
What you need for running Powerlink is:
1. Adapter from B&O Powerlink to Lexcom (cable part no. 6270017 ordered from B&O. Different lengths are avaiable. Look in the Master Link Handbook from B&O)
2. Power Link Module BO100-PL from Lexcom (article no. 30 633 0013 ordered from Lexcom reseller)
Se: http://www.schneider-electric.se/Downloads/PDF/monteringsanvisningar/LXH_Power_Link_moduleBO100-PLNEUTRAL98519_01.pdf
Good Luck!
ULO