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You can reference UL 62 and its FUII, especially in the FUII, you can see which tests need the UL engineer witness, but some suggestions, I can show you: 
1. Be familiar with UL62 and UL1581, know how many tests need to be done, and the corresponding test methods; 
2. Make sure that all the equipments are calibrated and can be traced to CNAS level; 
3. Prepare enough samples and related traceability documets(COC) for convenience... |   
 
 
 
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