Have to disagree with you. Most Nortel KSU do NOT have a connection point for that.
I believe it is because when their 1st electronic KSU's came out (the Vantage series), I was still at Bell. Bell was having a problem with KSU's blowing from lightning so they commissioned several of their "top-notch" PBX Repair Techs to do a province wide (maybe even a country-wide) study comparing results of those that were & were NOT grounded.
Apparently they found little difference if any as to the potential risk, with or without being grounded.
I'm sure few will agree with me but in my experience I've only had to change one KSU that was a known lightning hit.
