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UL 991

3rd Edition, June 9, 2010

Complete Document

UL Standard for Safety Tests for Safety-Related Controls Employing Solid-State Devices

Includes all amendments and changes through Revision Page(s) , June 9, 2010

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Product Details:

  • Revision: 3rd Edition, June 9, 2010
  • Published Date: June 9, 2010
  • Status: Active, Most Current
  • Document Language: English
  • Published By: UL (UL)
  • Page Count: 80
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

These requirements apply to controls that employ solid-state devices and are intended for specified safety-related protective functions.

These requirements address the potential risks unique to the electronic nature of a control. Equipment or components employing an electronic feature shall also comply with the basic construction and performance requirements contained in the applicable end-product or component standard. These requirements are intended to supplement applicable end-product or component standards and are not intended to serve as the sole basis for investigating the risks of fire, electric shock, or injury to persons associated with a control.

These requirements do not cover controls covered by end-product standards in which an electronic control investigation is specified.

Sections 9 – 22 contain standardized test methods for investigating the performance of an electronic control when subjected to particular environmental stresses. The suitability of each test to a given control shall be determined by the end-product standard(s). Determination shall include an assessment of:

a) Whether the control will be exposed to a particular environmental stress in its application, and

b) Whether the response of the control to a particular environmental stress is relevant to its intended safety-related protective function in its application.