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It's so easy!
" ~3 D p% V/ R0 J; ^( tIPI: it's the first inspection before your shipment, don't ship any products with UL mark without finishing the IPI.
5 a# H i+ G4 }7 }) G- DRegular 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 j! o& f0 t% ^: Y4 v
IIP: now it's changed to IMP(increased monitor program), it's an pulish procedure.+ l2 D# P, q! l
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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