ETL Semko is part of Intertek Testing Services Co., Ltd., which is the largest product and commodity inspection organization in the world. It has 240 laboratories and 469 offices in 93 countries in North America, Europe and Asia. ETL Semko provides product safety testing and certification, EMC testing, product performance testing, and registration of quality management systems in various industries such as medicine, HVAC, appliances, telecommunications, aviation, automation, semiconductors, building materials, energy generation systems, etc.

Any electrical, mechanical or electromechanical product with ETL inspection mark indicates that it has been tested and complies with relevant industry standards. Each industry has different test standards, so the requirements for specific products must be consulted with professionals. ETL inspection mark is widely used in cable products, indicating that it has passed relevant tests.

Approval of electrical products is mandatory in most parts of the United States. ETL means ETL Testing Laboratories Inc. ETL’s listed products are recognized by “authorities having jurisdiction” and can be considered as “approved”