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UL 551 - UL STANDARD FOR SAFETY TRANSFORMER-TYPE ARC-WELDING MACHINES - EIGHTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING NOVEMBER 19, 2013 Organization: UL
Date: 2009-04-24
Description: These requirements do not cover motor-generator sets or rectifier- or resistance-type welding machines. These requirements do not cover industrial or professional use welders.
UL 508C - UL STANDARD FOR SAFETY POWER CONVERSION EQUIPMENT - FOURTH EDITION Organization: UL
Date: 2016-05-16
Description: These requirements also cover power-supply modules, input/output modules, Silicon Controlled Rectifier (SCR) or Transistor output modules, dynamic braking units, and input/output accessory kits for use with power conversion equipment.
UL 1562 - UL STANDARD FOR SAFETY TRANSFORMERS, DISTRIBUTION, DRY-TYPE - OVER 600 VOLTS - FOURTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING OCTOBER 22, 2015 Organization: UL
Date: 2013-01-25
Description: These requirements do not cover the following transformers: a) Instrument transformers b) Step-voltage and induction voltage regulators c) Current regulators d) Arc furnace transformers e) Rectifier transformers f) Specialty transformers (such as rectifier, ignition, gas tube sign transformers, and the like) g) Mining transformers h) Motor-starting reactors and transformers These requirements do not cover transformers under the exclusive control of electrical utilities utilized for communication, metering, generation, control, transformation, transmission, and distribution of electric energy regardless of whether such transformers are located indoors, in buildings and rooms used exclusively by utilities for such purposes; or outdoors on property owned, leased, established rights on private property or on public rights of way (highways, streets, roads, and the like).
UL 69 - UL STANDARD FOR SAFETY ELECTRIC-FENCE CONTROLLERS - TENTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING DECEMBER 04, 2013 Organization: UL
Date: 2009-06-30
Description:   These requirements do not cover electric-fence controllers for the continuous (uninterrupted) current type or intermediate equipment, such as a converter, a rectifier, or the like, that is sometimes used between the primary source of supply and an electric-fence controller and that is investigated only as part of a complete controller.
NECA NEIS 410 - STANDARD FOR INSTALLING AND MAINTAINING LIQUID-FILLED TRANSFORMERS Organization: NECA
Date: 2013-01-01
Description: Cast coil transformers 5. Arc furnace transformers 6. Rectifier transformers 7. Network transformers 8.
CSA C22.2 NO 66.3 - LOW VOLTAGE TRANSFORMERS - PART 3: CLASS 2 AND CLASS 3 TRANSFORMERS - FIRST EDITION; UPDATE NO. 1: NOVEMBER 2012 Organization: CSA
Date: 2006-04-17
Description: In addition to the items specified in Clause 1.3 of Part 1, the requirements of Part 3 do not cover: a) Power supplies (a transformer provided with a rectifier is considered a power supply); b) Toy transformers; c) Cord and plug connected transformers other than Class 3; d) Direct plug-in transformers; e) Transformers intended for use in audio, radio, or television type appliances; or f) Other special types of transformers covered in requirements for other electrical devices or appliances.
UL 5085-3 - UL STANDARD FOR SAFETY LOW VOLTAGE TRANSFORMERS – PART 3: CLASS 2 AND CLASS 3 TRANSFORMERS - FIRST EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING NOVEMBER 30, 2012 Organization: UL
Date: 2006-04-17
Description:   In addition to the items specified in Clause 1.3 of Part 1, the requirements of Part 3 do not cover: a) Power supplies (a transformer provided with a rectifier is considered a power supply); b) Toy transformers; c) Cord and plug connected transformers other than Class 3; d) Direct plug-in transformers; e) Transformers intended for use in audio, radio, or television type appliances; or f) Other special types of transformers covered in requirements for other electrical devices or appliances.
UL 201 - UL STANDARD FOR SAFETY GARAGE EQUIPMENT - THIRD EDITION Organization: UL
Date: 2015-03-31
Description:   These requirements cover the following: a) Equipment used in servicing and repairing automobiles, such as dynamometers, battery testers, roll-up brake lathes, distributor testers, driveway signals, engine analyzers, exhaust emissions testers, generator-alternator-regulator testers, growlers, ignition testers, rectifier diode testers, timing lights, fluid changing equipment, tire changers, tune-up testers, wheel alignment and balance equipment, and other similar equipment primarily for use in garages and service stations.
UL 1459 - UL STANDARD FOR SAFETY TELEPHONE EQUIPMENT - THIRD EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING MARCH 01, 1999 Organization: UL
Date: 1995-09-21
Description: These requirements do not cover centralized AC or DC power systems that exceed the limits for Level C (see Tables 28.1 and 28.2), including battery banks (plants), DC power supplies, rectifiers, motor/generators, and the like, that form part of these systems.
UL 1012 - UL STANDARD FOR SAFETY POWER UNITS OTHER THAN CLASS 2 - EIGHTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING APRIL 08, 2016 Organization: UL
Date: 2010-11-09
Description:   These requirements cover power supplies for centralized ac or dc power systems, including dc power supplies, rectifiers, and the like, that form part of these systems.

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