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It's so easy!
: E& E8 }* u4 Z8 B* ?+ ~IPI: it's the first inspection before your shipment, don't ship any products with UL mark without finishing the IPI.* e1 G# e6 T2 A: k
Regular inspection: after the IPI, normally, for R file, there will be four times follow up inspection per year for UL, but for L file, it depends on the output of your products.9 k; y/ b0 ^4 I9 l, B8 j
IIP: now it's changed to IMP(increased monitor program), it's an pulish procedure.1 g( _1 [. s( D) a, X
VN: variation notice/finding, if found, the UL auditor will issue VN, mayby hold-shippment is required, now UL will fine the factory for the VN. |
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