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There were several changes in the test specifications as well. In 2nd edition, the surge voltage rating was determined by measuring the clamp voltage during a 6kV/500A surge pulse. In 3rd edition, the VPR rating is determined using a 6kV/3kA pulse. The result is that the VPR rating will be higher than the previous SVR rating for the same device. Another change in testing was the addition of the Nominal Discharge Current, or IN, test. This test is used to determine the surge capability of the SPD. Type 1 devices and type 4 or 5 devices intended for use in type 1 SPDs, are tested at 10kA or 20kA. Type 2 and type 4 or 5 devices intended for use in type 2 SPDs, can be tested at 3kA, 5kA, 10kA or 20kA. The test current levels for Type 1 and Type 2 are chosen by the manufacturer of the SPD. Type 3 devices are tested at 3kA using a duty cycle test similar to 2nd edition. The 3rd edition also increased the “Overvoltage test” from 110% to 115% of rated voltage. Therefore, the voltage rating of the surge component used to meet 2nd edition may need to be increased to the next higher rating to comply with 3rd edition.
