In 1988, the Occupational Safety & Health Administration (OSHA) created the NRTL program which defines the set of criteria to which a lab could prove itself to be worthy to provide evaluation, testing and certification of electrical products. Nationally Recognized Testing Laboratories have been recognized by OSHA as meeting the legal requirements in 29 CFR 1910.7 to perform safety testing and certification of products covered using consensus based test standards.

What is a NRTL (Nationally Recognized Testing Laboratory)?

A Nationally Recognized Testing Laboratory (NRTL) is an independent third-part laboratory recognized by the United States Occupational Safety and Health Administration (OSHA) to test and certify products to applicable product safety standards.

OSHA requires various types of products, devices, assemblies, or systems that are used in the workplace, to be tested and certified by a third-party organization designated as a Nationally Recognized Testing Laboratories (NRTL). Nationally Recognized Testing Laboratories have been recognized by OSHA as meeting the legal requirements in 29 CFR 1910.7 to perform safety testing and certification of products covered using consensus based test standards.

Due to MET’s decade long battle of challenging UL’s dominance of product safety certification, in 1988 OSHA created the NRTL program which defines the set of criteria to which a lab could prove itself to be worthy of NRTL status and ensure that certain types of equipment be tested and certified for their safe use in the workplace. MET Laboratories became the nation’s first Nationally Recognized Testing Laboratory (NRTL) in the United States.

What are NRTL Standards?

OSHA determines which product standards are to be used as they relate to worker safety. OSHA’s standards contain requirements for NRTL product testing and certification for 39 product types. OSHA requires NRTL approval for many kinds of electrical equipment when they are used in the workplace.

Test standards determined to be appropriate for use under OSHA’s NRTL Program include ANSI, IEEE, NEMA, CSA, and UL standards. The need for UL approvals for product safety compliance is actually a common misconception in the industry. While UL does coordinate standards writing, they are only one of several NRTLs for testing and certification.

Click here to view OSHA’s list of products requiring NRTL approval.

MET is the global service leader for product safety approvals and regulatory certification of electrical products — With facilities, accreditations, and 60 years of experience to get your products approved and to market faster. MET currently has OSHA approval to test and certify to over 200 product standard categories. The table below details the standards that apply.

Click here to view MET’s full Scope of Recognition.

Programs:
2. Acceptance of testing data from independent organizations, other than NRTLs.
3. Acceptance of product evaluations from independent organizations, other than NRTLs.
4. Acceptance of witnessed testing data.
5. Acceptance of testing data from non-independent organizations.
6. Acceptance of evaluation data from non-independent organizations (requiring NRTL review prior to marketing).
7. Acceptance of continued certification following minor modifications by the client.
8. Acceptance of product evaluations from organizations that function as part of the International Electrotechnical Commission Certification Body (IEC-CB) Scheme.
9. Acceptance of services other than testing or evaluation performed by subcontractors or agents.
Product Standards:
ANSI A17.5 Elevator and Escalator Electrical Equipment
ANSI C12.1 Code for Electricity Meters
ANSI/IEEE C57.13 Terminology and Test Code for Instrument Transformers
ANSI/UL 5 Surface Metal Raceways and Fittings
UL 5A Nonmettalic Surface Raceways and Fittings
ANSI/ISA 12.12.01 Nonincendive Electrical Equipment for Use in Class I & II, Division 2 & Class III, Divisions I & 2 Hazardous
ANSI/UL 22 Electric Amusement Machines
UL 45 Portable Electric Tools
UL 48 Electric Signs
ANSI/AAMI ES60601-1:2005/(R)2012 Medical electrical equipment, Part 1: General requirements for basic safety and essential performance (with amendments)
ASME A17.5 Elevator and Escalator Electrical Equipment
IEEE C57.13 Terminology and Test Code for Instrument Transformers
ISA 12.12.01 Nonincendive Electrical Equipment for Use in Class I and II, Division 2 and Class III, Divisions 1 and 2 Hazardous (Classified) Locations
NEMA C12.1 Code for Electricity Meters
UL 5 Surface Metal Raceways and Fittings
UL 5A Nonmetallic Surface Raceways and Fittings
UL 22 Electric Amusement Machines
UL 48 Electric Signs
UL 50 Enclosures for Electrical Equipment
UL 50E Enclosures for Electrical Equipment, Environmental Considerations
UL 65 Electric Wired Cabinets
UL 73 Electric Motor-Operated Appliances
UL 82 Electric Gardening Appliances
UL 122 Electric Photographic Equipment
UL 130 Electric Heating Pads
UL 153 Portable Electric Lamps
UL 183 Manufactured Wiring Systems
UL 197 Commercial Electric Cooking Appliances
UL 201 Garage Equipment
UL 231 Electrical Power Outlets
UL 234 Low Voltage Lighting Fixtures for Use in Recreational Vehicles
UL 244A Solid State Controls for Appliances
UL 250 Household Refrigerators and Freezers
UL 291 Automated Teller Systems
UL 294 Access Control System Units
UL 325 Door, Drapery, Gate, Louver and Window Operator and Systems
UL 355 Cord Reels
UL 399 Drinking Water Coolers
UL 412 Refrigeration Unit Coolers
UL 416 Refrigerated Medical Equipment
UL 427 Refrigerating Units
UL 430 Waste Disposers
UL 458 Power Converters/Inverters and Power Converter/Inverter Systems for Land Vehicles and Marine Crafts
UL 466 Electric Scales
UL 469 Musical Instruments and Accessories
UL 471 Commercial Refrigerators and Freezers
UL 474 Dehumidifiers
UL 482 Portable Sun/Heat Lamps
UL 484 Room Air Conditioners
UL 498A Current Taps and Adapters
UL 499 Electric Heating Appliances
UL 506 Specialty Transformers
UL 507 Electric Fans
UL 508 Electric Industrial Control Equipment
UL 508A Industrial Control Panels
UL 508C Power Conversion Equipment
UL 514A Metallic Outlet Boxes, Electrical
UL 541 Refrigerated Vending Machines
UL 561 Floor-Finishing Machines
UL 563 Ice Makers
UL 588 Seasonal and Holiday Decorative Products
UL 664 Commercial Dry-Cleaning Machines (Type IV)
UL 676 Underwater Lighting Fixtures
UL 705 Power Ventilators
UL 745-1 Portable Electric Tools
UL 745-2-1 Particular Requirements of Drills
UL 745-2-3 Particular Requirements for Grinders, Polishers, and Disk-Type Sanders
UL 745-2-5 Particular Requirements for Circular Saws and Circular Knives
UL 745-2-14 Particular Requirements for Planers

UL 745-2-17

Particular Requirements for Routers and Trimmers
UL 745-2-31 Particular Requirements for Diamond Core Drills
UL 745-2-32 Particular Requirements for Magnetic Drill Presses
UL 745-2-35 Particular Requirements for Drain Cleaners
UL 745-2-36 Particular Requirements for Hand Motor Tools
UL 745-2-37 Particular Requirements for Plate Jointers
UL 749 Household Dishwashers
UL 751 Vending Machines
UL 756 Coin and Currency Changers and Actuaters
UL 763 Motor-Operated commercial Food Preparing Machines
UL 775 Graphic Arts Equipment
UL 778 Motor-Operated Water Pumps
UL 813 Commercial Audio Equipment
UL 826 Household Electric Clocks
UL 858 Household Electric Ranges
UL 867 Electrostatic Air Cleaners
UL 859 Personal Grooming Appliances
UL 869A Standard for Service Equipment
UL 913 Intrinsically Safe Apparatus and Associated apparatus for Use in Class I, II, and III, Division 1, Hazardous Locations
UL 916 Energy Management Equipment
UL 917 Clock-Operated Switches
UL 923 Microwave Cooking Appliances
UL 924 Emergency Lighting and Power Equipment
UL 935 Fluorescent-Lamp Ballasts
UL 961 Electric Hobby and Sports Equipment
UL 963 Sealing, Wrapping, and Marking Equipment
UL 982 Motor-Operated Household Food Preparing Machines
UL 987 Stationary and Fixed Electric Tools
UL 998 Humidifiers
UL 1008 Transfer Switch
UL 1012 Power Supplies
UL 1017 Vacuum Cleaning Machines and Blower Cleaners
UL 1018 Electric Aquarium Equipment
UL 1026 Electric Household Cooking and Food Serving Appliances
UL 1028 Hair Clipping and Shaving Appliances
UL 1042 Electric Baseboard Heating Equipment
UL 1054 Special-Use Switches
UL 1069 Hospital Signaling and Nurse-Call System
UL 1081 Swimming Pool Pumps, Filters, and Chlorinators
UL 1082 Household Electric Coffee Makers and Brewing-Type Appliances
UL 1083 Household Electric Skillets and Frying-Type Appliances
UL 1086 Household Trash Compactors
UL 1090 Electric Snow Movers
UL 1203 Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations
UL 1230 Amateur Movie Lights
UL 1236 Battery Chargers for Charging Engine-Starter Batteries
UL 1244 Electrical and Electronic Measuring and Testing Equipment
UL 1248 Engine-Generator Assemblies for Use in Recreational Vehicles
UL 1261 Electric Water Heaters for Pools and Tubs
UL 1278 Movable and Wall or Ceiling Hung Electric Room Heaters
UL 1310 Direct Plug-In Transformer Units
UL 1363 Relocatable Power Taps
UL 1419 Professional Video and Audio Equipment
UL 1431 Personal Hygiene and Health Care Appliances
UL 1447 Electric Lawn Mowers
UL 1448 Electric Hedge Trimmers
UL 1449 Transient Voltage Surge Suppressors
UL 1450 Motor-Operated Air Compressors, Vacuum Pumps, and Painting Equipment
UL 1492 Audio-Video Products and Accessories
UL 1559 Insect-Control Equipment – Electrocution Type
UL 1563 Electric Spas, Equipment Assemblies, and Associated Equipment
UL 1564 Industrial Battery Chargers
UL 1573 Stage and Studio Lighting Units
UL 1574 Track Lighting Systems
UL 1594 Sewing and Cutting Machines
UL 1598 Luminaires
UL 1638 Visual Signaling Appliances–Private Mode Emergency and General Utility Signaling
UL 1640 Portable Power-Distribution Equipment
UL 1647 Motor-Operated Massage and Exercise Machines
UL 1662 Electric Chain Saws
UL 1727 Commercial Electric Personal Grooming Appliances
UL 1740 Industrial Robots and Robotic Equipment
UL 1741 Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resources
UL 1776 High-Pressure Cleaning Machines
UL 1778 Uninterruptible Power Supply Equipment
UL 1786 Nightlights
UL 1795 Hydromassage Bathtubs
UL 1838 Low Voltage Landscape Lighting Systems
UL 1863 Communication Circuit Accessories
UL 1951 Electric Plumbing Accessories
UL 1993 Self-Ballasted Lamps and Lamp Adapters
UL 1994 Luminous Egress Path Marking Systems
UL 1995 Heating and Cooling Equipment
UL 1996 Electric Duct Heaters
UL 2021 Fixed and Location Dedicated Electric Room Heaters
UL 2044 Commercial Closed Circuit Television Equipment
UL 2089 Vehicle Battery Adapters
UL 2108 Standard for Low Voltage Lighting Systems
UL 2157 Electric Clothes Washing Machines and Extractors
UL 2158 Electric Clothes Dryers
UL 2161 Neon Transformers and Power Supplies
UL 2202 Electric Vehicle (EV) Charging System Equipment
UL 2594 Standard for Electric Vehicle Supply Equipment
UL 2735 Standard for Electric Utility Meters
UL 2738 Standard for Induction Power Transmitters and Receivers for Use with Low Energy Products
UL 5085-1 Low Voltage Transformers – Part 1: General Requirements
UL 5085-3 Low Voltage Transformers – Part 3: Class 2 and Class 3 Transformers
UL 6500 Audio/Visual and Musical Instrument Apparatus for Household, Commercial, and Similar General Use
UL 8750 Standard for Light Emitting Diode (LED) Equipment for Use in Lighting Products
UL 8752 Organic Light Emitting Diode (LED) Panels
UL 60065 Audio, Video and Similar Electronic Apparatus
UL 60079-0 Explosive Atmospheres – Part 0: Equipment – General Requirements
UL 60079-1 Standard for Explosive Atmospheres – Part 1: Equipment Protection by Flameproof Enclosures “d”
UL 60079-2 Explosive Atmospheres—Part 2: Equipment Protection by Pressurized Enclosure “p”
UL 60079-11 Explosive Atmospheres—Part 11: Equipment Protection by Intrinsic Safety “i”
UL 60079-15 Explosive Atmospheres—Part 15: Equipment Protection by Type of Protection “n”
UL 60335-1 Safety of Household and Similar Electrical Appliances, Part 1; General Requirements
UL 60335-2-3 Household and Similar Electrical Appliances, Part 2: Particular Requirements for Electric Irons
UL 60335-2-8 Household and Similar Electrical Appliances, Part 2: Particular Requirements for Shavers, Hair Clippers, and Similar Appliances
UL 60335-2-34 Household and Similar Electrical Appliances, Part 2; Particular Requirements for Motor Compressors
UL 60335-2-40 Household and Similar Electrical Appliances – Safety – Part 2-40: Particular Requirements for Electrical Heat Pumps, Air Conditioners and Dehumidifiers
UL 60601-1 Medical Electrical Equipment, Part 1: General Requirements for Safety
UL 60745-1 Hand-Held Motor-Operated Electric Tools – Safety – Part 1: General
UL 60745-2-2 Hand-Held Motor-Operated Electric Tools-Safety-Part 2-2: Particular Requirements for Screwdrivers and Impact Wrenches
UL 60745-2-4 Hand-Held Motor-Operated Electric Tools – Safety – Part 2-4: Particular Requirements for Sanders and Polishers Other Than Disk
UL 60745-2-6 Hand-Held Motor-Operated Electric Tools – Safety – Part 2-6: Particular Requirements for Hammers
UL 60745-2-8 Hand-Held Motor-Operated Electric Tools – Safety – Part 2-8: Particular Requirements for Shears and Nibblers
UL 60745-2-9 Hand-Held Motor-Operated Electric Tools – Safety – Part 2-9: Particular Requirements for Tappers
UL 60745-2-11 Hand-Held Motor-Operated Electric Tools – Safety – Part 2-11: Particular Requirements for Reciprocating Saws
UL 60745-2-12 Hand-Held Motor-Operated Electric Tools – Safety – Part 2-12: Particular Requirements for Concrete Vibrators
UL 60745-2-15 Hand-Held Motor-Operated Electric Tools – Safety – Part 2-15: Particular Requirements for Hedge Trimmers
UL 60745-2-16 Hand-Held Motor-Operated Electric Tools – Safety – Part 2-16: Particular Requirements for Tackers
UL 60745-2-18 Hand-Held Motor-Operated Electric Tools – Safety – Part 2-18: Particular Requirements for Strapping Tools
UL 60745-2-20 Hand-Held Motor-Operated Electric Tools – Safety – Part 2-20: Particular Requirements for Band Saws
UL 60947-1 Standard for Low Voltage Switchgear and Controlgear – Part 1: General Rules
UL 60947-4-1 Standard for Safety Low Voltage Switchgear and Controlgear—Part 4-1: Contactors and Motor-Starters – Electromechanical Contactors and Motor-Starters
UL 60950 Information Technology Equipment
UL 61010-2-51* Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use—Part 2-051: Particular Requirements for Laboratory Equipment for Mixing and Stirring
UL 61010-2-81 Standard for Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use—Part 2-081: Particular Requirements for Automatic and Semi-Automatic Laboratory Equipment for Analysis and Other Purposes
UL 61010-2-91 Standard for Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use—Part 2-091: Particular Requirements for Cabinet X-Ray Systems
UL 61010-2-101* Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use—Part 2-101: Particular Requirements for In Vitro Diagnostic (IVD) Medical Equipment
UL 61010A-1 Electrical Equipment For Laboratory Use; Part 1: General Requirements
UL 61010B-1 Electrical Measuring and Test Equipment; Part 1: General Requirements
UL 61010C-1 Process Control Equipment
UL 61800-5-1 Standard for Adjustable Speed Electrical Power Drive Systems – Part 5-1: Safety Requirements – Electrical, Thermal and Energy
UL 62368-1 Audio/Video, Information and Communication Technology Equipment – Part 1: Safety Requirements
Restrictions/Limitations on Recognition Granted:
Note: * Testing and certification of products under this test standard is limited to Class I locations. Explosion testing is also limited to current test chamber capabilities.