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Typical Registered Certification Marks1


NRTLs use the following marks to certify products for purposes of OSHA product-approval requirements. However, the presence of the mark on a product does not necessarily mean that it meets OSHA requirements, since NRTLs sometimes use these same or similar marks for non-OSHA purposes. OSHA accepts only those products that contain the NRTL's mark and that the NRTL has certified within its scope of recognition, which includes the test standards and testing sites that OSHA has recognized for the NRTL. See the OSHA web page for information on each NRTL's scope of recognition, or contact OSHA or the NRTL for additional information.


Applied Research Laboratories, Inc. (ARL) (recognition terminated effective 1/28/08)

The abbreviation "NRTL" must appear below the ARL mark.


Canadian Standards Association (CSA) (also known as CSA International)

Marks below used for products meeting only U.S. standards

CSA mark
CSA mark

Mark below used for gas-fueled products meeting U.S. standards (see note2)

CSA mark

Marks below used for products meeting both U.S. and Canadian standards

CSA mark
CSA mark

Canadian Standards Association (CSA)(mark formerly used by the American Gas Association (AGA), exclusively licensed to CSA until June 30, 2001)

AGA mark

Communication Certification Laboratory, Inc. (CCL) (DBA Nemko-CCL, Inc.)

Mark below used for products meeting only U.S. standards (Commenced use - August 2013)

Nemko US mark

Mark below used for products meeting only U.S. and Canadian standards (Commenced use - August 2013)

Nemko US & Canada mark

Mark below used for products meeting US Standards through August 2015

CCL mark

Curtis-Straus LLC (CSL)

Marks below used for products meeting only U.S. standards (see note3)

CSL US mark

Original mark (use allowed until May 1, 2010)

CSL marl

Mark below used for products meeting both U.S. and Canadian standards (see note3)

CSL US & Canada mark

Electrical Reliability Services, Inc. (ERS) (also known as eti Conformity Services and formerly Electro-Test, Inc. (ETI)) (recognition terminated effective 6/23/08)


Entela, Inc. (Voluntary termination effective 1/28/08 - acquired by the parent company of ITSNA)

Entela marks are now being used by ITSNA. See ITSNA marks below.


FM Global Technologies LLC (FM) (also known as FM Approvals and formerly Factory Mutual Research Corporation)

Mark below used for products meeting only U.S. standards

FM mark

Mark below used for products meeting both U.S. and Canadian standards

FM mark

International Association of Plumbing and Mechanical Officials EGS (IAPMO)

IAPMO mark

Intertek Testing Services NA, Inc. (ITSNA) (formerly ETL Testing Laboratories, Inc.)

Marks below used for products meeting only U.S. standards

ETL mark ETL mark WHI mark WHI mark

Marks below used for products meeting both U.S. and Canadian standards

ETL mark WHI mark

(Note: In 2004, Entela, Inc., was acquired by the parent company of ITSNA.)

ENT mark
ENT mark

MET Laboratories, Inc. (MET)

Mark below used for products meeting only U.S. standards Commenced use - January 2006)

MET mark

Marks below used for products meeting both U.S. and Canadian standards (Commenced use - January 2006)

MET mark MET mark

Mark below used for products meeting both U.S. and Canadian standards (original MET mark)

MET mark

NSF International (NSF)

Mark below used for products meeting only U.S. standards. Use to expire 12/31/2012

NSF US mark

Mark below used for products meeting only U.S. standards (see note4)

NSF US mark

Mark below used for products meeting both U.S. and Canadian standards. Use to expire 12/31/2012

NSF C & US mark

Mark below used for products meeting both U.S. and Canadian standards

NSF C & US mark

National Technical Systems, Inc. (NTS) (recognition expired effective 6/21/12)


QAI Laboratories, LTD (QAI)

QAI mark

QPS Evaluation Services Inc (QPS)

Mark below used for products meeting only U.S. standards

QPS mark

Mark below used for products meeting both U.S. and Canadian standards

QPS mark

SGS North America, Inc. (SGS) (formerly SGS U. S. Testing Company, Inc.)

New SGS Certification Mark (Commenced use - August 2013)

SGSUS mark

Mark Below - Old SGS Certification Mark Used through August 2018

SGSUS mark

Southwest Research Institute (SWRI)

SWRI mark

TÜV SÜD America, Inc. (TUVAM)

Mark below used for products meeting only U.S. standards

2008 TUV mark

Use to commence in early 2008 (see note5)

Mark below used for products meeting both U.S. and Canadian standards

TUVAM mark

TÜV SÜD Product Services GmbH (TUVPSG)

Mark below used for products meeting only U.S. standards

2008 TUV mark

Use to commence in early 2008 (see note5)

Mark below used for products meeting both U.S. and Canadian standards

TUVPSG mark

TUV Rheinland of North America, Inc. (TUV)

Note: two TUV marks temporarily removed from this page.

Mark below used for products meeting only U.S. standards

TUV mark TUV mark

NRTL previously used mark above but ceased authorizing on or about January 2000.

Marks below used for products meeting both U.S. and Canadian standards

TUV mark TUV mark

Use to commence in February 2010


TUV Rheinland PTL, LLC (TUVPTL)

Mark below used for products meeting only U.S. standards

TUV mark

Marks below used for products meeting both U.S. and Canadian standards

TUV mark TUV mark

Underwriters Laboratories Inc. (UL)

Marks below used for products meeting only U.S. standards

UL mark

Basic mark

UL mark

Equivalent to above

Marks below used for products meeting both U.S. and Canadian standards

UL mark

Basic mark

UL mark

Equivalent to above


Wyle Laboratories (WL) (recognition terminated effective 8/24/11)


1Certification marks registered by the NRTL with the US Patent and Trademark Office. Some NRTLs may have additional marks; however, the core logo of the additional marks should be the same as represented here. If you have questions about the authenticity of any mark, contact the NRTL.

2OSHA requirements for testing and certification of gas operated equipment is limited to equipment using "liquefied petroleum gas" ("LPG" or "LP-Gas").

3CSL Note: Notice of Allowance issued on 11-21-06

4NSF Note: Version of mark previously shown on OSHA web page - never placed in use

NSF original mark

5TUVAM and TUVPSG note: Notice of Allowance issued on 10-9-07

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