12. Multi-Stage SPD Coordination · 第 3/5 頁
SPDs with UPS and Generators
Protect both utility and alternate sources.

Utility side
Protect the UPS input from line surges.
Bypass / output
Consider protection strategy for bypass paths and downstream distribution—especially if alternate feeders exist.
Generators
Switching and lightning on external generator yards can introduce surges; protect transfer switch boards accordingly.
