When describing Surge Protective Devices (SPDs), manufacturers typically specify surge capacity ratings as either “Per Mode” or “Per Phase.” ►Learn More: [ Ссылка ]
Users can sometimes be confused by these terms. This paper describes how these terms apply to SPD ratings and demonstrates their application to a four-wire Wye system, which is among the most common wiring configurations. The principles explained herein can be applied to wiring systems using other voltages and configurations.
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