15. Monitoring, Status & Maintenance · Page 6 of 6
Maintenance Myths
Avoid false comfort.

Myth: no trips means SPDs are fine
SPDs can reach end of life without tripping a main breaker.
Myth: sealed board means no inspection
Use remote contacts or scheduled opening under LOTO.
Myth: replace only what failed
If one phase cartridge failed in a severe event, inspect all phases and downstream stages.
