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You can understand them in an easy way, normally:
2 M* m' h4 v: Y8 L1. R category product is some kind of Regular products, it also can cover both UL listed and recognized products, and normally for this kind of products, the inspection frequency is 4 times per year, anyway, there are some special cases, for example, plastics(QMMFZ2), if all required samples are available during one time inspection, then once per year is enough;
# F* `! t, j6 D( z2. L category product is this kind of UL products which must use UL labels(released by UL directly), for example, wire and cable(UL758/UL62/UL764/UL817), lamps(UL153/UL1598), for this kind of products, the inspection frequency depends on the output of the products. |
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