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UL 1561 - UL STANDARD FOR SAFETY DRY-TYPE GENERAL PURPOSE AND POWER TRANSFORMERS - FOURTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING JUNE 16, 2015 Organization: UL
Date: 2011-03-02
Description: Waveshaping or rectifying circuits may include components such as diodes and transistors. Components such as capacitors, transient voltage surge suppressors, and surge arresters are not considered to be waveshaping or rectifying devices.
UL 879 - UL STANDARD FOR SAFETY ELECTRIC SIGN COMPONENTS - NINTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING JUNE 11, 2014 Organization: UL
Date: 2009-10-09
Description: Components covered by this standard include the types specified in 1.1.2, including electromechanical components that convey a message or outline the structural features of a building by electronically directing or rechanneling available light from other sources and involving all forms of illumination such as: a) Fluorescent lighting, b) High intensity discharge (HID) lighting, c) Neon lighting, d) Cold cathode lighting, e) Light emitting diodes (LED), and f) Electroluminescent lighting.

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