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Useful Links: Product Testing & Certification

This list represents a sampling of electrical product testing and certification laboratories and is neither an endorsement nor a list of recommended service providers. The user should research the companies to find a laboratory or product certifier best suited for his or her needs. For more information about conformity assessment, visit NEMA's ABCs of Conformity Assessment page.

The list is broken down into three categories as follows:

  1. National Certification Bodies (NCBs) recognized under the IECEE CB scheme
  2. Accepted Certification Bodies (ACBs) recognized under the IECEx Scheme
  3. Nationally Recognized Testing Laboratories (NRTLs) recognized by OSHA.

In some cases, a laboratory may be recognized by more than one of the three schemes under their individual rules of operation.

The user is encouraged to visit the websites of the individual schemes for specific contact information as well as detailed listing of the capabilities for which the laboratories are recognized.

In addition to these product certifiers, there are many other testing laboratories in the United States, some of which conduct testing of electrical products but which may not operate a certification program involving an issuance of a certification mark. The National Institute of Standards and Technology (NIST) publishes a Special Publication SP 903 with information on over one hundred testing laboratories, some of which test electrical products and components. There are indexes, which can be used to locate those that engage in the testing of electrical products.

In addition, the American Society for Testing and Materials (ASTM) publishes LAB01, Directory of Testing Laboratories. The 2001 Edition contains over 1000 testing laboratories, some of which test electrical products and components.


The IECEE CB Scheme is a worldwide program in which product certifiers are recognized for their ability to test and certify electrical products in various product categories related to the electroindustry. In the U.S. there are currently six recognized National Certification Bodies (NCBs) as follows:

3033 Madison Ave. SE
Grand Rapids, MI 49548
(416) 241 8427​
MET Labs, Inc.
914 W. Patapsco Avenue
Baltimore, MD 21230-3432
(410) 354-3300​
FM Approvals
1151 Boston-Providence Turnpike
Norwood, MA 02062
(781) 255-4820​
TUV Rheinland North America
12 Commerce Road
Newton, CT 06470
(203) 426-0888​
Intertek Testing Services
165 South Main Street
Cortland, NY 13045-2995
(607) 753-6711​
Underwriters Laboratories Inc.
333 Pfingsten Road
Northbrook, IL 60062-2095
(708) 272-8800​

IECEx Scheme

The IECEx Scheme is a worldwide program in which product certifiers are recognized for their ability to test and certify electrical products and enclosures used in hazardous locations where the presence of gas or dust can result in an explosive condition in the presence of electrical discharges that are not contained. At the present time, there is only one Accepted Certification Body (ACB) recognized as follows:

Underwriters Laboratories Inc.
333 Pfingsten Road
Northbrook IL 60062-2096
(847) 664-2469


The U.S. Department of Labor's Occupational Safety and Health Administration (OSHA) operates a program to qualify Nationally Recognized Testing Laboratories (NRTLs) for their ability to certify products for safe use in the workplace. At the present time there are nineteen NRTLs recognized as follows:

Applied Research Laboratories, Inc.
5371 NW 161st Street
Miami, Florida 33014
(305) 624-4800​
Canadian Standards Association
(also known as CSA International)
178 Rexdale Boulevard
Etobicoke, Ontario, Canada
M9W 1R3
(416) 747-4000​
Communication Certification Laboratory, Inc.
1940 West Alexander Street
Salt Lake City, Utah 84119
Curtis-Straus LLC
527 Great Road
Littleton, Massachusetts 01460
(978) 486-8880​
Detroit Testing Laboratory, Inc.
7111 E. Eleven Mile
Warren, Michigan 48092
(810) 754-9000​
Entela, Inc.
3033 Madison, S.E.
Grand Rapids, Michigan 49548
(800) 888-3787​
eti Conformity Services
6900 Koll Center Parkway, Suite 415
Pleasanton, CA 94566
(800) 468-6384
FM Global Technologies LLC
(also known as FM Approvals)
1151 Boston-Providence Turnpike
P.O. Box 9102
Norwood, Massachusetts 02062
(781) 762-4300​
Intertek Testing services NA, Inc.
(formerly ETL)
3933 U.S. Route 11
Cortland, New York 13045
(800) 345-3851​
MET Laboratories, Inc.
914 West Patapsco Avenue
Baltimore, Maryland 21230
(800) 638-6057​
National Technical Systems, Inc.
533 Main Street
Acton, MA 01720​
NSF International
789 Dixboro Road
Ann Arbor, MI 48105
(800) 673-6275​
SGS U.S. Testing Company, Inc.
(formerly UST-CA)
291 Fairfield Avenue
Fairfield, New Jersey 07004
(973) 575-5252​
Southwest Research Institute
6220 Culebra Road
Post Office Drawer 28510
San Antonio, Texas 78228
(210) 684-5111​
TUV America, Inc.
5 Cherry Hill Drive
Danvers, Massachusetts 01923​
TUV Product Services GmbH
Ridlerstrasse 65, D-80339
Munich, Germany
(011) 49-89-5008-4335​
TUV Rheinland of North America, Inc.
12 Commerce Road
Newtown, Connecticut 06470
(203) 426-0888​
Underwriters Laboratories Inc.
333 Pfingsten Road
Northbrook, Illinois 60062
(847) 272-8800​
Wyle Laboratories, Inc.
7800 Highway 20 West
P.O. Box 077777
Huntsville, Alabama 35807
(256) 837-4411​


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