Most areas in the United States, the approval of electrical products is mandatory. ETL refers to the ETL Testing Laboratories (ETL Testing Laboratories Inc). ETL is a column name products, "the competent authority having jurisdiction" (Authorities Having Jurisdiction) recognized, can be considered "approved."

ETL generally do not need to pre-certification of factory inspection, subject to periodic unannounced factory inspections, including follow-up examination, including plans to compensate for these checks to charge an annual fee.

If necessary, the inspectors witnessed the product can be re-testing or testing in the laboratory after sampling.

License must sign a legal contract with the ETL (service agreement), it clearly specifies the responsibilities of manufacturers and continuous ETL and ETL listing the conditions for the use of signs.

ETL certification is being made in two ways, one is transferred through the CB test report can also directly apply, submit the required documents as follows:

1. Application Form
2.CB test certificate (with direct application is not required)
3.CB copies of test reports (direct application is not required)
4. Sample
5. Other relevant test results and product data, such as: product manuals, photos, parts lists and more.
(As reported by CB switch, you need to carry out different tests)