Underwriters Laboratories Inc.
The UL Mark
Abbreviation UL Formation 1894 Type Standards organization Headquarters Northbrook, Illinois, United States Region served 98 countries President, CEO and Trustee Keith E. Williams Staff 6,808 (2008) Website www.ul.com
Underwriters Laboratories Inc. (UL) is an independent product safety certification organization. Established in 1894, the company has its headquarters in Northbrook, Illinois. UL develops standards and test procedures for products, materials, components, assemblies, tools and equipment, chiefly dealing with product safety. UL also evaluates and certifies the efficiency of a company’s business processes through its management system registration programs. Additionally, UL analyzes drinking and other clean water samples through its drinking water laboratory in South Bend, Indiana and evaluates products for environmental sustainability through its subsidiary, UL Environment.
UL is one of several companies approved for such testing by the U.S. federal agency Occupational Safety and Health Administration (OSHA). OSHA maintains a list of approved testing laboratories, known as Nationally Recognized Testing Laboratories.
Underwriters Laboratories Inc. was founded in 1894 by William Henry Merrill. Early in his career as an electrical engineer in Boston, a 25 year old Merrill was sent to investigate the World Fair’s Palace of Electricity. Upon seeing a growing potential in his field, Merrill stayed in Chicago to found Underwriters Laboratories.
Merrill soon went to work developing standards, launching tests, designing equipment and uncovering hazards. Aside from his work at UL, Merrill served as the National Fire Protection Association’s secretary-treasurer (1903–1909) and president (1910–1912) and was an active member of the Chicago Board and Union Committee. In 1916, Merrill became UL’s first president.
UL published its first standard, “Tin Clad Fire Doors,” in 1903. The following year, the UL Mark made its debut with the labeling of a fire extinguisher. In 1905, UL established a Label Service for certain product categories that require more frequent inspections. UL inspectors conducted the first factory inspections on labeled products at manufacturers’ facilities—a practice that remains a hallmark of UL’s testing and certification program.
UL has expanded into an organization with 64 laboratory, testing and certification facilities serving customers in 98 countries. It has also evolved from its roots in electrical and fire safety to address broader safety issues, such as hazardous substances, water quality, food safety, performance testing and environmental sustainability.
On August 28, 2007, the nonprofit and tax-exempt UL announced that its Board of Trustees had resolved to develop a for-profit testing and certification subsidiary.
The parent nonprofit company will continue to develop safety standards—with the for-profit subsidiary intended to generate money to be used for this work. The for-profit part of the business promotes the sales of standards developed by the nonprofit part. 
UL Standards 
- Electrical Enclosures
- Boxes-Junction and Pull (BGUZ)
- Cabinets and Cutout Boxes-Sheet Metal (CYIV)
- Industrial Control Panel Enclosures (NITW)
- Industrial Control Panels
- Industrial Control Panels (NITW)
- Flame Control Panels
- Power Press Control Panels
- Industrial Control Equipment
- Auxiliary Devices (NKCR)
- Solid State
- Combination Motor Controllers (NKJH)
- Float and Pressure-Operated Switches (NKPZ)
- Magnetic Motor Controllers (NLDX)
- Manual Motor Controllers (NLRV)
- Motor Controllers-Miscellaneous (NMFT)
- Miscellaneous Apparatus (NMTR)
- Switches, Industrial Control (NRNT)
- Programmable Controllers (NRAQ)
- Proximity Switches (NRKH)
- High-Voltage Industrial Control Equipment
- Motor Controllers, Over 1500 V (NJHU)
- Motor Controller Accessories, Over 1500 V (NJIJ)
- Medium Voltage Power Conversion Equipment (NJIC)
- Power Conversion Equipment
- Power Conversion Equipment (NMMS)
- Locks for Safes
- Mechanical Dial Combination Locks (Group I and Group II)
- Electronic Locks
- Biometric Locks
- Baseefa — a similar organization in the UK
- Canadian Standards Association a similar organization in Canada; also serves as a competitive alternative for USA products
- ETL SEMKO — a competing testing laboratory, part of Intertek; based in London, UK
- IAPMO R&T — a competing certification body, based in Ontario, California, USA
- MET Laboratories, Inc. — a competing testing laboratory based in Baltimore, Maryland, USA
- NTA Inc — a competing certification agency based in Nappanee, Indiana, USA
- Sira — a similar organization for the UK/Europe
- TÜV — a similar German approvals organisation
- Consumer Reports
- Consumers Union
- Fire test
- Good Housekeeping Seal
- National Sanitation Foundation
- Product certification
- Quality control
- Safety engineering
- UL94, a flammability standard
- ^ a b "UL Press Kit". Underwriters Laboratories. September 2009. http://www.ul.com/global/eng/documents/corporate/newsroom/UL_PressKit.pdf. Retrieved 28 February 2010. [dead link]
- ^ "U.S.A." Underwriters Laboratories. Retrieved on August 10, 2010. "Corporate Headquarters 333 Pfingsten Road Northbrook, IL 60062-2096."
- ^ News Release,[dead link] Underwriters Laboratories, 28 August 2007.
- ^ [http://www.cpsc.gov/LIBRARY/FOIA/meetings/mtg08/ul4_10.pdf Log of Meeting for Underwriters Laboratories (UL) to describe their for-profit subsidiary], U.S. Consumer Product Safety Commission, 10 April 2008.
- ^ UL Standards and Outlines of Investigation, Underwriters Laboratories
- List of US NRTLs at OSHA
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