Class 1, 2 and 3 effective surge and lightning arrestors. The items shown below are used when a building has external lightning protection installed or will be exposed to direct lightning strikes.
3-Phase Installations including Class 1 and Class 2
1-Phase Installations including Class 1 and Class 2
Minimum requirements for all DB Board installations.
Only fully effective if Class 1 lightning current arrestors are installed in upstream DB Boards.
3-Phase Installations Class 2 only
1-Phase Installations Class 2 only
1-Phase Loose Combination Installations Class 3 only