The City of Los Angeles Electrical Test lab (or LADBS-ETL) was established in 1925 to provide assistance to the industry, local manufacturers, business, inspection authorities, hospitals, importers, construction projects and the citizens of the City of Los Angeles in obtaining product approval at a low cost. As such, the test lab tests electrical products for compliance with the established safety standards as well as the requirements of the electrical code. A product is considered approved by the LADBS-ETL, when it conforms to the accepted, established, or amended safety standard(s), as well as the electrical code.

At times, where there are no specific standard, or an existing safety standard lacks in evaluation or testing of an electrical product, the electrical test lab develops or expands safety standards in conformance with the electrical code and evaluates the product to assure protection from fire, shock and personnel hazard.