Service Entrance SPD - Selecting & Installing

externally created electrical surges is the Surge Protection Device (SPD) installed at the main service entrance. The term SPD is a generic description defined by the IEC. Within the USA “SPDs” are further categorized as:- the Transient Voltage Surge Suppresser (TVSS) and the Secondary Surge Arrester. In accordance

  Devices, Selecting, Installing, Surge, Selecting amp installing