10. GDT, Spark Gaps & Hybrid SPDs · Page 4 of 5
Choosing Technology for a Site
Entrance vs distribution vs equipment rooms.

Entrance
Favor Type 1 or Type 1+2 capable of lightning impulse current where LPS/overhead exposure exists.
Distribution
MOV-based Type 2 devices are usually optimal.
Fine protection
Low-Up Type 3 / equipment devices near sensitive loads.
