The necessity of UL certification of electrical control cabinet
the U.S. Occupational Safety and Health Administration (OSHA) requires that all electrical equipment in the workplace be "certified" or undergo a complete and comprehensive assessment (29 CFR 1910.303 and 1910.399) before use, so electrical control cabinets exported to the U.S. and North American markets need to be certified for safety. UL508A is the standard for the primary electrical control cabinet design safety requirements, and UL's on-site assessment is the accepted method to meet this requirement.
UL certification standard for electrical control cabinet
UL 508A Standard for Safety for Industrial Control Cabinets(UL Standard for Safety for Industrial Control Panels)
The UL 508A standard covers requirements for industrial control cabinet enclosures, general environmental industrial control cabinets, general industrial machinery, and requirements for special purpose industrial control cabinets (e. g., air conditioning and refrigeration, crane control, elevator control, flame control, marine use, etc.). Industrial control cabinets for general environments.
Electrical control cabinet UL508A certification structure requirements
1. Shell requirements;
requirements for electrical components;
3. Requirements for grounding devices;
4. Field wiring requirements for circuits;
5. Internal wiring requirements of the circuit;
6. Requirements for isolation devices;
7. Branch circuit protection requirements;
8. Electrical controller requirements;
9. Control circuit internal wire requirements;
10. General control circuit overcurrent protection requirements;
11. Overcurrent protection requirements for control transformers;
12. Operator control panel requirements;
13. Identification requirements.
Electrical control cabinet UL508A certification process
1. Project determination: confirm the UL standard, certification cost and time, sample quantity, etc.
2, data preparation: according to the requirements of UL, the enterprise is ready to certify the required information or documents;
3. Sample delivery test: the enterprise will send the sample accredited Testing Laboratory conduct product testing;
4, the issuance of the report: the product test results meet the requirements of UL standards, the formal issuance of the test report;
factory audit: UL will conduct the first factory inspection of the production plant to ensure compliance with standard requirements;
6, mark use: after the audit meets the requirements, the applicant is officially authorized to use the UL mark.