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Saturday, March 20, 2010

UL, CSA, ETL and CE: Whats the Difference?

UL, CSA, ETL and CE: Whats the Difference?

If you look on the back panel of Crown amplifiers or PIP modules, youll see a silk-screened certification mark or logo such as UL, CSA, ETL or CE. The CE logo also appears on Crown microphone cartons. What do these certification marks mean?

Basically they are stamps of approval. Crown products with those logos meet rigorous standards for electrical safety and electromagnetic emissions. The acronyms are spelled out below:

UL: Underwriters Laboratories Inc.
CSA: Canadian Standards Association
ETL: Originally a mark of ETL Testing Laboratories, now a mark of Intertek Testing Services.
CE: Conformance European (Communaut Europ enne or Conformit Europ enne)

Lets look more closely at each organization.

In operation for more than a century, Underwriters Laboratories Inc. is an independent nonprofit organization that writes and tests products for safety and certifies them. UL has developed more than 800 standards for safety, and millions of products and their components are tested to ULs safety standards.

ULs web site is at Information about UL standards can be found at

Some examples of UL standards are:

UL 1492: Audio-Video Products and Accessories
UL 1419: Professional Video and Audio Equipment
UL 1581: Reference Standard for Electrical Wires, Cables, and Flexible Cords
UL 1411: Transformer and Motor Transformers for Use in Audio-, Radio-, and Television-Type Appliances
UL 6500: Standard for Audio/Video and Musical Instrument Apparatus for Household, Commercial, and Similar General Use

If a Crown product is UL listed, you know it has passed ULs stringent tests for electrical safety. For example, the chassis is


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