my company makes TVSS / SPD systems among many other gear ranging from green energy on out to traditional power. We even have mopeds!
www.alpha.com
Ours is a strikesorb technology and also includes a strike meter with dry contact alarm outputs.
We install a Tier1 TVSS at the MDP or off the ATS.
We instll furhter units downstream as a branch off any desired panel board the customer wants to invest in.
we have single or 3phase units capable of managing Wye or Delta situations.
its in your design, your customer wants it, you know you have to provide it so there you go,, you now can source it at the best cost.
sometimes sittng around asking "why" ends up costing time and money, at the end of the day if your customers design exceeds the AHJ requirements, then naturally the customers standard will be the guidline to follow. Happens to me every single day.,, my customers standards typically exceed the NEC and the AHJ, some inspectors spend a lot of time asking us "why" we over killed the installation.
have fun with the ring..
#2 solid CU ring with cad welds to ground rods approx ever 10' apart which the #2awg sol will be min 30'' below grade or below frost line ~which ever is greater.
Inspection wells flush with the grade and to include cover with test points available and accessable for future fall of potential ring testing to insure a customer desired resistance of (insert number here) or less than 15ohms.
2) #2 solid omni directional feeders coming into your bulding to a newly supplied MGB in which these two wires will be located on opposite sides of the MGB.
for a ground ring certification,,, contact the nation wide coverage company "AETCO", they have performed final acceptance testing for many of my projects.
