GB and UL product standards for SPD

There is a big difference between the products under the UL system and the product standards under the GB system. On the one hand, due to differences in power distribution systems, products require different considerations in design; on the other hand, due to differences in the understanding of the products themselves between the two major standard systems, the UL standard focuses more on the safety testing of the products themselves. , the GB standard focuses more on the performance test of the product itself. As far as SPD product standards are concerned, the national standard adopts the IEC 61643 standard, the standard number is GB / T 18802. 11 - 2020 (hereinafter referred to as "GB standard"), and the SPD standard under UL is UL 1449 CRD / 5- 2014 "Standard" For Safety SurgeProtective Devices" (hereinafter referred to as "UL Standard")

Under the two standard systems, there are big differences in SPD. It can be simply summarized into the following 6 more obvious differences:

a. UL and GB standards have different SPD product classification rules. UL distinguishes Type 1, Type 2, and Type 3 SPD products according to the installation location of the SPD, whether external protection equipment is required, and whether it is a fixed type.
b. UL standard certification is a certification process from component to product. Not only the performance of the final product is certified, but also the raw materials and components of the product are required to comply with UL standards.
c. There is no definition of the maximum surge energy in the UL standard; while in the GB standard, the manufacturer of the maximum surge energy can claim its own product performance. In the GB standard, the test waveforms for Type 1 and Type 2 are 10 / 350 μs waveform and 8 / 20 μs waveform respectively; while in the UL standard, the 10 / 350 μs waveform is not defined, whether it is Type 1 or Type 2. Tested with 8 / 20 μs waveform.

d. UL standards are more focused on safety: tests such as short circuit and overvoltage are more comprehensive and stricter.

e. GB standard focuses more on the performance parameters of lightning protection: surge discharge capability and Up.

f. All tests to UL standards are maintained in the original condition of the samples and no modifications to the product are allowed.

There is no difference between the two standards, because the test methods are different, and the differences in SPD performance parameters under the GB and UL standards are not comparable.