A document associated with a Standard or Outline of Investigation to announce the adoption of new and/or revised requirements or Provide information related to the use of the Standard or Outline.

An electronic document associated with a UL Standard for Safety or Outline of Investigation, and issued by UL to propose:

Superceded or withdrawn, previously published UL Standards and revised pages, Bulletins, and announcements issued for these Standards; and prior editions of existing UL Standards and revised pages, Bulletins, and announcements issued for the edition. Request must be reviewed and approved by UL. Available only in a hardcopy, printed format.

A compilation of the National Differences that have been identified for the specific IEC-based UL Standard. The National Differences represent those requirements that apply in the US. The National Differences for each IEC-based Standard are also contained within the published UL version of the IEC Standard. May not be available for all IEC-based UL Standards.

A normative document that is developed by a Certification Organization when a Canadian Recognized Standard, a National Standard of Canada, or a Canadian Code does not cover some or all aspects of a product to be certified. An ORD provides an equivalent level of safety or performance as provided for similar functions in existing standards.

Outlines of Investigation are certification documents developed whose content and copyright are owned by UL LLC. Outlines of Investigation are not consensus documents and are not developed through the standards development process administered by UL Standards.

Recommended Practices are UL Standards documents that provide instructions for performing one or more specific operations. Recommended Practices contain only non-mandatory provisions.

UL Standards for Safety are continuously revised and updated–for example, to keep them abreast of technological advances and of field experience with the product category. Furthermore, because nationally recognized installation and use codes–with which UL Standards are intended to be compatible–are periodically revised to meet changes in the state of the art and conditions of use, UL Standards for Safety must be correspondingly revised. A UL Standard is current only if it incorporates the most recently adopted revisions. Revisions are available in only a hardcopy, printed format.

A document developed, established, and maintained in compliance with ULC Standards and UL Standards development processes for standards. A basic tenet of standards development is the consensus process involving the stakeholder community.

A Published Standard that is provided in a hardcopy, printed format. A Published Standard consists of the current active version of the Standard plus any published revisions, CRDs, TGDs and/or Formal Interpretations that have been issued on or before the date the Standard is shipped. NO future revisions or proposals are provided. Also provided are PDF files for any UL LLC CRDs and TGDs and/or Formal Interpretations that have been issued on or before the date the Standard is purchase.

An electronic version of a UL Published Standard in Adobe PDF format containing the complete text of the current version of the Published Standard, including all figures, equations, formulas, indexes, supplements, and appendixes. Any published or adopted revisions that have been issued on or before the date the Electronic Standard is shipped are merged into the text of the Standard.

Rain Test Nozzle—used in the simulated rain tests in UL’s Standards

Sharp Edge Tester and Sharp Edge Tester Kit—used to determine if an edge is sharp enough to cause a cut-type injury

UL Articulate Probe—used to evaluate the accessibility of live parts or moving parts through openings in an enclosure

IEC Flexible Test Finger—used to evaluate the accessibility of live parts or moving parts through openings in an enclosure

Certification Requirement Decisions (CRDs) are certification documents developed and owned by UL LLC. Certification Requirement Decisions are not consensus documents.

UL Formal Interpretations are Official Interpretations of an ANSI/UL Standard can only be made by UL. Interpretations are not appealable.

A reference document that assists in understanding the application of requirements contained in the corresponding UL Standard and addressing the use and applications of the respective products covered by the associated UL Standard(s), or both. Technical Guidance Documents are developed and maintained by UL LLC and are not part of UL Inc.’s standards program.