Learning path
From lightning concepts to low-voltage power-line SPD products—a structured guide for engineers, panel builders, and local partners.
12. Multi-Stage SPD Coordination · Page 4 of 5
A protected power rail with unprotected data lines still fails.
RS-485, Ethernet, and analog loops can inject damaging energy into a "protected" PLC if only power is SPD-equipped.
At each LPZ boundary, list every copper circuit and assign protection.
Door controllers and long Wiegand/OSDP runs are frequent victims—protect both PSU and data.
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