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It's so easy!
3 @5 h. B2 e/ J3 |! t' v, E' ~; kIPI: it's the first inspection before your shipment, don't ship any products with UL mark without finishing the IPI.9 G* x/ h Q1 o9 v7 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.! A, H* C1 P) e7 E; c' U& Y
IIP: now it's changed to IMP(increased monitor program), it's an pulish procedure.% |! u+ n$ l" Y: k
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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