Characteristics Of Spd In Other Installation Locations

At the junction of LPZ0 and LPZ1, SPDs installed on lines drawn from the outdoors should be products that meet the T1 classification test (i.e., the lightning current amplitude of a 10/350µs waveform passing through the SPD). The flow rate is determined by determining the lightning current amplitude based on the building's lightning protection category and the energy distribution along various pipes and lines after the lightning current directly strikes the building.

At the junction of LPZ1 and LPZ2, at the distribution panel or before the UPS, a second-level surge protective device should be installed. Products that have passed T1 or T2 classification tests should be used. Their nominal discharge current, In, is typically 20kA (8/20us).

At critical terminal equipment or precision sensitive equipment, a third-level surge protector should be installed. Products that have passed T1 or T2 classification tests should be used. Their nominal discharge current, In, is typically 10kA (8/20us). surge protection device also offers a shorter response time.