UL certification testing, tracking
 

Certification inspection Rules

 

Inspection by UL inspectors is essentially mechanical. Depending on the product, the inspector's inspection is based on Bulletin, Procedure, FUII (if available, included in the Procedure) and UL standard (if required in FUII). If UL products are being produced at the factory when the inspector visits, or UL products are in stock, the inspector will take samples in one of the following ways:

 

1, extract each part from the production line plus a complete product extracted from the warehouse.

 

2. Extract each part from the warehouse and add the complete product on the production line.

 

3. Extract the complete product from the warehouse for splitting.

 

The specific amount of sampling is determined by the specifications, FUII (follow-up inspection instructions), SAP (standard supplement), or direct orders from the UL laboratory. Inspectors do not necessarily inspect all products at each inspection, but they will try to inspect all product categories or models in one year or at least two years.

 

Generally speaking, UL's requirements for the factory's production system are not too high, only requiring that the instrument and equipment be measured once a year, the factory's own inspection records be kept, and there are certain means of control for nonconforming products. During the inspection, the field representative (UL inspector) will focus on the product itself, and they will check the structure, components and assembly of the product according to the above inspection criteria. For parts related to product safety, the general rules will indicate that the requirements are UL certified products, and will indicate the manufacturer and model; For moulded parts such as shells and shields, the details will generally specify their raw materials and size requirements. The field representative will check the UL mark as stated above and in the details.

 

In addition, if the specification or FUII or standard requires field testing of the product, the field representative will ask the factory inspector to do the corresponding tests, while the field representative will be there to witness. If the detailed rules also require samples to be sent to UL for follow-up testing, the factory shall cooperate with the inspector to make corresponding samples. After the inspector writes the sample label, provides the address and seals the samples, the factory will send them to the corresponding UL laboratory. If the products produced by the factory fully meet the requirements of the corresponding UL inspection standards, and there are no other violations of the tracking service agreement, the inspector will issue a tracking inspection report. The factory representative shall sign the report after confirming its accuracy; One inspection is complete. If there is any non-conformity with the inspection standard during the inspection process, the inspector will issue a VariationNotice and take corresponding measures according to the specific circumstances. If the UL mark is used for unauthorized products, the inspector will require the UL mark to be removed. If the product does not meet UL requirements, the inspector will ask the factory to remove the UL mark or rework to make it meet the requirements; If the factory does not agree with the above treatment opinions, the UL mark can be retained temporarily, but the shipment must be stopped. The inspector will inform the corresponding laboratory of the situation, and UL will make a reply to decide whether the UL mark can be retained. If there are only some minor problems that do not affect the safety of the product, the inspector will make a temporary acceptance decision and report it to the corresponding laboratory; If it is some obvious standard errors, such as typos or unit errors, it does not affect the conformity of the factory product, but as a UL document processing, the inspector will also issue a change notice. In general, unless it is UL's responsibility, the inspector will ask the factory to explain the non-conformance to the corresponding laboratory, and UL will respond accordingly according to your explanation. Of course, the inspector's judgment is only temporary, and the final decision is of course in UL's various laboratories. If the factory does not agree with the inspection practice, it can fully reflect to the corresponding laboratory, at this time, the inspector is obliged to provide the corresponding contact and contact method. After confirming that the contents recorded in the change notice are correct, the factory representative shall sign the notice.

 

Tracking detection frequency

 

UL has clear regulations on the frequency of tracking inspection in factories.

 

Under normal circumstances, for most R factories, inspectors visit four times a year, but do not rule out the possibility of two times a quarter, unless there is a special instruction, the total number of times must not exceed four. If a product does not meet UL requirements and needs to be reworked during inspection, the UL inspector will add an additional inspection to confirm that the product has been reworked at the time of shipment and meets UL requirements.

 

For On-Call services, at least once a year.

 

QMFZ2, QMFZ3-Plastics (Plastics) quarterly until all required follow-up test samples are obtained for UL laboratories. WPYR2-Special-UseSwitches (Special purpose switches), see the following table: Quarterly output UL Quarterly maximum number of tests  

0-25000-1 & have spent

2, 25000-100000 & have spent

3, 100000-250000 & have spent

4, 250000-500000 & have spent

6, 500000-750000 & have spent

10, 750000-1000000 & have spent

1000000-1250000-11 & have spent

1250000-2500000-12 & have spent

2500000-20 < / div >