8. SPD Types: Type 1, 2 & 3 · Page 7 of 7
Type Selection Worksheet
Walk through a board and assign SPD types.

Questions per board
- Is there an external LPS or overhead line feeding this building?
- How long is the cable from the upstream SPD?
- What is the most sensitive load downstream?
- Is remote signaling required?
Output
A simple table: Board → SPD Type → Poles → Up target → Backup protection.
