UL is short for Underwriter Laboratories Inc. UL,
The laboratory is the most authoritative in the United States, and is also the world's larger engaged in safety testing and certification
Institutions. It is an independent, nonprofit, professional organization that conducts experiments for public safety. It USES a
Scientific testing methods to study and determine the impact of various materials, devices, products, equipment, buildings, etc on life,
Whether there is any harm to the property and the degree of such harm; Identify, write, and publish standards and help reduce and
To prevent the loss of life and property data, while carrying out the business of fact-finding. Anyway, UL is both
The United States product safety testing and certification agency, is also the founder of the United States product safety standards, the ultimate
The aim is to obtain commodities with a fairly safe level for the market and to ensure the safety of human health and property
To the extent that product safety certification is an effective means of eliminating technical barriers to international trade, UL
It also plays a positive role in promoting the development of international trade. UL evaluates over 19,000 products annually
Components, materials and systems, and 21 billion UL marks on 71,000 products.
It was not until 1916 that UL became fully self-supporting. After nearly a century of development, UL has become a world known
It has a complete set of strict organization management system, standard development and product recognition
Certificate program. Currently, UL has five laboratories in the United States, with headquarters north of Chicago
In Northbrook, laboratories have been set up in Taiwan, Hong Kong and Japan. UL
Our network of subsidiaries and services spans the world, with 66 laboratories, tests and accreditation in 104 countries
Credit institutions. Together with CCIC, we established UL meihua certification co., LTD in China.
UL certified classification
The types of UL product certification and test services can be mainly divided into listing, recognition and classification:
1) LISTED: generally, LISTED names are only applicable to complete products and qualified people
All kinds of devices and devices that are replaced or installed in the field by the personnel. The products listed in UL include:
Home appliances, medical equipment, computers, business equipment, and electrical products that function in buildings,
Such as distribution systems, fuses, wires, switches and other electrical components. UL listed products, usually
Each product can be labeled with the UL column name. The use of the column name flag.
2) Recognized: the Recognized service is a Recognized product in the UL service
Products can only be used as components and raw materials on UL list, classification or other approved products. Approved to produce
The product is not structurally complete or is limited in use to ensure the desired safety performance.
In most cases, the tracking service for approved products falls into category R. Approved products in category L have electronics
Wire (AVLV2), processed wire (ZKLU2), wire harness (ZPFW2), aluminum wire (DVVR2),
And metal flexible tubes (DXUZ2). Approved products are required to carry an approved label.
3) Classification: a Classification service evaluates, or evaluates, only specific hazards of a product
Implement standards other than UL (including internationally recognized standards such as IEC and ISO)
Product evaluation. Generally speaking, most graded products are not products used by consumers, but industries
Or commercially used products. The classification mark in the UL mark indicates that the product is certain when identified by UL
Of the limits and scope of the provisions. For example, for industrial solvents such as chemicals, only for its reach
The range of possible fires at ignition temperature is evaluated. Classification service and listing service for certain products
The same, but generally only to a certain aspect of the product or several aspects of the evaluation, such as in the United States, medical
Equipment such as X-ray diagnostics is subject to national compliance with U.S. laws and regulations regarding the accuracy of radiation emission and beam.
But since UL only USES x-rays as a grading product, it only evaluates its mechanical, electrical and other properties
It's nonradiative in terms of its performance.
UL certified classification
4) multiple listing, multiple accreditation or multiple grading services: when a UL applicant is in receipt of the above
After the services are listed, approved or graded, the products are to be produced under the name of another company to meet the needs of the sales.
You can apply for multiple listing, multiple recognition or multiple rating services, in this case, get the listing, recognition
Or the manufacturer of the rating is allowed to use the name of another company in the product catalog, but the product is not the company's name
No., product code or other features that UL considers acceptable must be in addition to the original listing, endorsement or
Products of the same grade.
5) "AL" listing, accreditation or grading services: if UL applicant does not wish to be listed in the name of his own company
He may apply to use another firm (usually a retailer or wholesaler) for name, recognition or classification services
Nominally applying for listing, recognition or classification is called "AL" listing, recognition or classification service. With multiple column names,
The difference between multiple accreditation or multiple rating services is that the applicant is not listed as a celebrity.
6) system certification services: as a member of the international accreditation council, UL has extensive involvement in ISO9000 quality
Quality system certification, ISO14000 environmental protection certification, QS9000 automotive industry quality system certification and
AS9000 aircraft industry quality system certification services.
Information required for UL certification
1. Written application form
2. Company information of the applicant: company name, address, contact person, postcode, telephone and fax
3. Full name of the product
4. Product model, variety and classification number (in need of testing)
5. Product photos
6. Product specification
7. Functional schematic diagram
8. List of model differences
9. Copy of parts certificate
10. Circuit diagram (PCD board diagram)
11. Product installation manual
UL certification process
1. The applicant submits the relevant company and product information
2. According to the product data provided, the certification engineer shall determine: UL standard, engineering cost of testing and testing
Time, sample quantity, etc
3. Conduct product test (usually directly in UL test or UL authorized test qualification third-party laboratory
Data)
4. If the test passes, UL will issue the test qualification report and tracking service details (the test report will detail the test
The test condition, the index reached by the sample, the product structure and the safety mark suitable for the use of the product, etc. Tracking service
The specifications include a description of the product and instructions for the UL area inspector.
5. Conduct factory audit and pass the audit. The applicant is authorized to use UL mark
6. Supervision after obtaining the certificate
Note: 1. Most types of products are inspected at least four times a year. The inspectors inspect the products to ensure continuity
Continue to comply with UL requirements, please notify UL of any changes you plan to make to the product structure or components
With minor changes and no need to repeat any experiments, UL can quickly modify the tracking service specification to make it available to inspectors
To accept this change. When UL considers that changes to the product have affected its safety performance, it is necessary to apply to the company for a new application
Submit samples for necessary testing.
2. Factory audit fee and test fee shall be calculated separately
UL certification requirements
Factory inspection requirements:
Before the first factory inspection, the factory shall prepare the following documents for inspection:
Organization chart
Flow chart of quality control
Production flow chart
Product change flow chart or documentation
Training records of QC personnel and key positions
Incoming inspection related documents (such as standards, operating instructions, etc.)
Process (production) inspection related documents
Shipping inspection related documents
Equipment management related documents (such as calibration certificate, equipment ledger, etc.)
Nonconforming product control
2. Annual factory inspection
The annual factory inspection requires the same data and process as the first factory inspection, but the annual factory inspection
Inspection must be carried out for product consistency inspection. The factory should submit the required documents for consistency inspection. For specific requirements, please see
Factory checks user manual.
American UL certification audit factory content
Factory inspection contents:
1. Organizational structure and quality system
The position, responsibilities and working conditions of the quality department in the factory
Personnel status (actual cognition and operation of QC personnel and key stations);
2. Incoming inspection
Inspection conditions (environment, equipment, metering/calibration conditions, personnel)
Piling up and marking of articles to be inspected, qualified products and wastes
Incoming inspection implementation (SOP: including sampling standard, AQL level, inspection method and
Determination of documentation, personnel operational capability, test records, determination and release, etc.)
Supplier audit;
3, warehouse
Warehouse conditions (machine and parts)
Storage and marking of parts and finished products, storage and delivery of finished products
The process of hair collar material, hair collar material control file
Check BOM document (parts list)
4. Production process
Operation instruction and personnel operation of important positions
Product identification and traceability
Handling of nonconforming products during production
Operating instructions and original records of inspectors
American UL certification audit factory content
5. Routine inspection
Operation instruction and operation condition and test record
Safety test equipment measurement/approval and daily function test record
6. Sampling inspection before shipment (final inspection)
Work instruction for sampling inspection (sampling standard: AQL level and inspection method)
Check the record
7. Equipment inspection
Safety test equipment ledger
Methods and records of approval of major equipment
Internal approval methods and records
8. Conformity inspection of certified products (applicable to annual inspection)
Are copies of CDF, photo and certificate issued by UL retained and available
Maintain and be able to provide records of conformance checks performed within the plant
Arrange the production of certified products or keep the pre-produced certified products in the warehouse
UL inspector checks with structural data and photographic data for discrepancies or safety violations.
Precautions for UL certification
1. When applying for UL certification, the applicant must find a third party laboratory authorized by UL
2. Many applicants know that UL certification can be done by a third party laboratory authorized by UL or directly
When connecting to UL, choose to directly contact UL for testing. At this point, the applicant is advised to contact UL authorized third party laboratory
It will be better to handle it, because the third party laboratory authorized by UL can do the test rectification for you and then send the samples
Check UL, UL directly use data a pass, test fee can be done basically a time, if directly find
UL, each retest is recharged, such as lifting wire test fee of more than 70,000, retest three times to pass,
UL bills can run to more than 220,000
3. Receiving the confirmation letter of passing the test does not mean getting UL certificate. Please pass it before shipment to the United States
Factory audit before UL mark production shipment, please remember