UL, CSA, ETL and CE: What They Mean

If you look on the back panel of Crown amplifiers or PIP modules, you will see a silk-screened certification mark or logo such as UL, CSA, ETL or CE. 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 http://www.ul.com. Information about UL standards can be found at http://ulstandardsinfonet.ul.com.

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 will know it has passed UL's stringent tests for electrical safety. For example, the chassis is grounded to the round pin on the power cord, so that if the hot lead of the power cord accidentally shorts to the chassis, the current will go to the building's safety ground and not through someone touching the amplifier chassis.


The Canadian Standards Association (CSA) is a nonprofit association serving business, industry, government and consumers in Canada and the global marketplace. Among many other activities, CSA develops standards that enhance public safety.

A Nationally Recognized Testing Laboratory, CSA is very familiar with U.S. requirements. According to OSHA regulations, the CSA-US Mark qualifies as an alternative to the UL Mark.

Here are some areas where CSA standards are applied:

  • Canadian Electrical Code, Part III-Outside Wiring
  • Electrical Engineering Standards
  • Electromagnetic Compatibility

Example: C108.8: Limits and Methods of Measurement of Electromagnetic Emissions


The ETL Listed Mark is an alternative to the CSA and UL marks.

ETL Testing Laboratories has been conducting electrical performance and reliability tests since 1896. Intertek Testing Services (ITS) acquired ETL from Inchcape in 1996. ITS is recognized by OSHA as a Nationally Recognized Testing Laboratory (NRTL), just as Underwriters Laboratories (UL), Canadian Standards Association (CSA) and several other independent organizations are recognized.

ITS tests products according to nearly 200 safety and performance standards. The ETL Listed Mark and C-ETL Listed Mark are accepted throughout the United States and Canada when denoting compliance with nationally recognized standards such as ANSI, IEC, UL, and CSA.

This certification mark indicates that the product has been tested to and has met the minimum requirements of a widely recognized (consensus) U.S. product safety standard, that the manufacturing site has been audited, and that the applicant has agreed to a program of periodic factory follow-up inspections to verify continued conformance.

If the mark includes a small US and/or C, it follows product safety standards of United States and/or Canada, respectively.


What is the CE mark, and what is its purpose?

The European Commission describes the CE mark as a "passport" that allows manufacturers to circulate industrial products freely within the internal market of the EU. The CE mark certifies that the products have met EU health, safety and environmental requirements that ensure consumer and workplace safety. All manufacturers in the EU and abroad must affix the CE mark to those products covered by the "New Approach" directives in order to market their products in Europe. Once a product receives the CE mark, it can be marketed throughout the EU without undergoing further product modification.

An important document related to CE is the Declaration of Conformity (D.O.C.). Basically it's a piece of paper which a company authority must sign to say that the device meets the requirements of the Directive. The D.O.C. must include a list of any standards used to justify the claim of compliance with the Directive. Youll see the Declaration of Conformity packed with certain Crown products, either separately or as part of the operation manual.

If a Crown product is stamped CE, the product does not emit excessive radiation (microwave or RF), and is not overly sensitive to picking up radiation.

Here are some examples of tests that electronic devices must pass to earn the CE mark:

EN 55103-1:1995 Electromagnetic Compatibility Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 1: Emissions 
EN 61000-3-2:1995+A14:2000 Limits for Harmonic Current Emissions (equipment input current <=16A per phase) 
EN 61000-3-3:1995 Limitation of Voltage Fluctuations and Flicker in Low-Voltage Supply Systems Rated Current <=16A 
EN 55103-2:1996 Electromagnetic Compatibility Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 2: Immunity 
EN 61000-4-2:1995 Electrostatic Discharge Immunity (Environment E2-Criteria B, 4k V Contact, 8k V Air Discharge) 
EN 60065: 1998 Safety Requirements Audio Video and Similar Electronic Apparatus

In summary, the certification marks on Crown products are your assurance that the product meets rigorous standards for electrical safety and electromagnetic emissions. It poses no shock hazard (except as noted on the product or in the manual), and it will not cause electromagnetic interference with other devices beyond a certain distance. You can use the product with confidence.

The following document provides more detailed information on certification marks. It also shows which test standards have been applied to Crown products.

Certification Listing Marks and Crown-Related Test Standards 


Regulatory Certification Marks on Crown Products: 

THX FCC ETL ETL-Canada CE C-Tick Keti UL UL-Canada CSA CSA-U.S.