what article in the NEC 2008 says you have to install a surge protection at a resisdential electric 120/240
I have used the following type TVSS and its purpose of usage in projects.
I mostly use the following type of TVSS in projects for protections.
they are legrand and ABB company
Type I: Main AC power entrance protection
The type I TVSS is designed to protect commercial
and industrial facilities from the damaging affects of
lightning. Power cables carry the damaging current into
facilities. The device shunts these damaging currents
safely to earth ground.
Type II: Distribution power ? Panel protection
The type II TVSS is designed to protect all standard
power Sub-distribution panel from damaging power line
transients.
Type III: Branch circuit and equipment protection
Telecom / Data line protector:
Protection of equipment connected onto telephone lines,
computer, communication or data links, and current
loops.