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Answer Posted / Sana Farid
SPD stands for Surge Protective Device. The classes of SPD are defined based on the energy they can handle during a surge event. There are four main classes: Class 1 (for sensitive electronic equipment), Class 2 (for low-voltage circuits with no exposed conductors), Class 3 (for equipment where personnel contact is possible), and Class 4 (for industrial equipment). Each class has specific voltage, energy, and current ratings.
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