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What is the difference between UL, ETL and CSA?

None.

The UL, CSA, and ETL Listed Marks are all certifications from Nationally Recognized Testing Laboratories (NRTLs) authorized by the U.S. federal agency Occupational Safety and Health Administration (OSHA) to conduct safety testing and provide certification marks.

These Listed Marks affirm that products have undergone testing by an impartial third party and have been confirmed to align with widely accepted safety standards. Manufacturers have the flexibility to engage any accredited Nationally Recognized Testing Laboratory (NRTL) for product evaluations.