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NEMA SPD 1.1 —Surge Protective Device Specification Guide for Low Voltage Power Distribution Systems

This guide 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. SPD 1.1 is available as a Free download via the NEMA website:
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