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The application differences between PVT1 and PVT2 are the same as for DT1 and DT2. It’s about exposure, hence the T1 units are tested using a 10/350uS waveform (Test Class 1) because they have to survive in the more exposed locations. T2 units are tested using the 8/20uS waveform (Test Class 2) to simulate a less exposed location or the second SPD in a cascading protection scheme