NEMA SPD 1.1-2019 describes a uniform specification methodology for SPDs, containing at least one non-linear component, that are connected to or within a 50/60 Hz power distribution equipment that is rated up to 1000 Vac.
Document identifier
NEMA SPD 1.1-2019
Title
Part 1-Surge Protective Device Specification Guide for Low Voltage Power Distribution Systems
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