UL Recognition
status is applied to the various modules, i.e. power supply units, PC motherboards, Nics, Video cards, DVD, hard/floppy drives, fans, etc.

UL Listed
status is applied to complete systems, i.e. PC system, Telecom Server.

CONDITIONS OF ACCEPTABILITY (C of A or C/A)
The limitations and conditions for end-product use of a component based on the investigation of the component covered by a Report.
Conditions of Acceptability are itemized in the Report of a Recognized or Unlisted Component.

Note that C-o-A will specify maximum operating ambient operating temperature (TMRA) which may be compromised when a component (i.e. PSU) is installed in a complete system subjected to UL Listing.

RECOGNITION REPORT
A Report of an investigation of a component that results in the establishment of UL's Recognition and Follow-Up Service.

RECOGNITION SERVICE
A service whereby UL determines that a manufacturer has demonstrated the ability to produce a component for use in an end product that complies with UL's requirements. It takes into account the performance and constructional characteristics of such end product insofar as this can be determined and the areas that require additional consideration for application of the component to the
product.
By the terms of UL's Service Agreement, UL authorizes the manufacturer to use the Recognized Marking and other required markings on components that comply with UL's requirements and establishes a Follow-Up Service conducted by UL as a check of the means the manufacturer exercises to determine compliance with UL's requirements.

RECOGNIZED COMPONENT
A part or subassembly covered under UL's Recognition Service and intended for factory installation in Listed (or other) products.
Recognized Components are incomplete in certain construction features or restricted in performance capabilities and not intended for separate installation in the field, rather they are intended for use as components of incomplete equipment submitted for investigation by UL.
Final acceptance of the component in the complete equipment is dependent  upon its installation and use in accordance with all applicable use conditions and ratings noted (1) in the component report issued by UL, (2) in the Guide Information and (3) in the individual client's Recognized Component Information Page.

RECOGNIZED COMPONENT INFORMATION PAGE
A page on UL's Listing Information System (LIS) that includes the name of the party who has qualified to use UL's Recognition Mark, the product category, specific identification of the components which the manufacturer has demonstrated the ability to produce to UL's requirements, and a description of the Recognized Marking and any other required markings.

RECOGNIZED MARKING
The marking that a component manufacturer is authorized to apply to a component manufactured under UL's Recognition Service.
It consists of the Recognized company identification/name and catalog number, model number or other designation. The UL Recognized Component Mark ( ) may be used in conjunction with the Recognized Marking.

TEMPORARY FOLLOW-UP SERVICE PROCEDURE
A product description sent to UL's Field Representative as a temporary inspection document providing the authorization required to permit a manufacturer to use the UL Mark on products which comply with the description prior to the issuance of a formal Follow-Up Service Procedure.

“UL LISTED” PRODUCT
A product that has been produced under UL's Listing and Follow-Up Service program in accordance with the terms of UL's Service Agreement and that
bears the UL Listing Mark as the manufacturer's declaration that the product complies with UL's requirements.
Can be a complete system made up of UL Recognized components and subjected to a reduced UL Investigation.

LISTEE
The company or individual whose name is used on, or in conjunction with, a
product and appears under a product category in one of UL's Product Directories and in a searchable, online database at UL's Intranet and Internet websites.
The terms “Classified company” or “Recognized company” are equivalent to Listee and used in relation to the other types of UL services.

LISTING MARK
This UL Mark consists of four elements: the UL symbol, the word “LISTED,” the product name (e.g., “Portable Lamp”), and a control number.