11. Selecting LV Power Line SPDs · Page 6 of 7
Worked Example: Commercial MDB
Walk through a simplified selection.
Scenario
400/230 V TN-S building with external LPS, office + server room loads, history of damaged LED drivers.
Entrance
Type 1+2, 3P+N, suitable Iimp, remote contact, pluggable if maintenance prefers.
Server room SDB
Type 2 with low Up; consider Type 3 at UPS / rack PDU if cable run is long.
Outcome
Staged protection addresses both lightning current at the LPS bond and residual surges at electronics.