UL Certification Overview — White Paper

UL Certification Overview — White Paper

Underwriters Laboratories Inc. (UL) is an independent product safety certification organization that tests products for compliance to specific safety standards. 

Industrial Control Equipment (NRAQ)

Products listed under this category include programmable industrial control systems utilizing a programmable memory for internal storage of user-oriented instructions for specific functions, such as logic, sequencing, counting, and controlling various industrial equipment through digital or analog inputs or outputs. Also include power supplies, central processing units, input and output accessories, computer interfaces, and programming or program diagnostic units associated with programmable control systems.

Information Technology Equipment (NWGQ)

Products listed under category covers equipment, appliances, and systems rated 600 V or less normally found in offices and other business establishments, residences (homes), educational facilities, and other similar environments classified as ordinary locations.

This equipment has been investigated for installation in information technology equipment (computer) rooms as defined in ANSI/NFPA 75, “Protection of Electronic Computer/Data Processing Equipment,” and Article 645 of ANSI/NFPA 70, “National Electrical Code” (NEC), unless the equipment is otherwise identified by a marking or instruction.

Various groupings of equipment are covered under this category, such as flat-panel displays, LCD displays, monitors, and plasma displays.

Industrial Control Panels (NITW)

Products listed under this category include industrial control panels, which are factory wired assemblies of industrial control equipment such as motor controllers, switches, relays and auxiliary devices. The panels may include disconnect means and motor branch circuit protective devices. Also covers industrial panel enclosures that are intended to house open type industrial control panels or individual items of industrial control equipment.

UL 50E

Applies to enclosures for electrical equipment intended to be installed and used in non-hazardous locations in accordance with the Canadian Electrical Code, Part I, CSA C22.1, the provisions of the National Electrical Code, NFPA 70, and the provisions of Mexico’s Electrical Installations, NOM-011-SEDE.

  • Enclosures for indoor locations, Types 1, 2, 5, 12, 12K, and 13
  • Enclosures for indoor or outdoor locations, Types 3, 3R, 3S, 4, 4X, 6, and 6P




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