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The United States Occupational Safety and Health Administration (OSHA) requires that 38 different types of products, devices, assemblies, or systems used in the workplace be "approved" (i.e., tested and certified) by third-party organizations identified as Nationally Recognized Testing Laboratories (NRTLs). As part of OSHA's NRTL Program, the ...
These are examples of "national recognized testing laboratories" (NRTL) approved by the U.S. Department of Labor's Occupational Safety and Health Administration (OSHA) under the requirements of 29 CFR 1910.7. [9] Only a listed device can carry the listing brand (or "mark") of the listing agency.
UL headquarters in Northbrook, Illinois. Underwriters Laboratories Inc. was founded in 1894 by William Henry Merrill.After graduating from the Massachusetts Institute of Technology (MIT) with a degree in electrical engineering in 1889, Merrill went to work as an electrical inspector for the Boston Board of Fire Underwriters. [9]
The National Voluntary Laboratory Accreditation Program (NVLAP), administered by the National Institute of Standards and Technology (NIST) in USA, offers accreditation for testing and calibration laboratories across various fields.
A certification listing is a document used to guide installations of certified products. After a field installation is completed, it is compared to the list to make sure that it complies with a regulation (e.g., a building code).
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The International Electrical Testing Association (NETA), formerly the National Electrical Testing Association, is a trade association dedicated to improving electrical testing standards in the United States and sharing those standards internationally.
VLE of the mixture of chloroform and methanol plus NRTL fit and extrapolation to different pressures. The non-random two-liquid model [1] (abbreviated NRTL model) is an activity coefficient model introduced by Renon and Prausnitz in 1968 that correlates the activity coefficients of a compound with its mole fractions in the liquid phase concerned.