These requirements cover indoor and outdoor use Class 2 power supplies and battery chargers
intended for use on alternating current branch circuits with a maximum potential of 150 V to ground. These requirements apply to:
a) Portable and semipermanent mounted direct plug-in units provided with 15 A blade
configurations for use on nominal 120 or 240 V branch circuits;
b) Cord- and plug-connected units provided with a 15 or 20 A attachment plug configuration; and
c) Units permanently connected to the input supply.
Units may also be provided with a direct current input jack for being powered from a vehicle battery
adapter. These units utilize an isolating transformer and may incorporate components to provide an alternating- or direct-current output. Each output provides Class 2 power levels in accordance with the National Electrical Code, ANSI/NFPA 70. Maximum output voltage does not exceed 42.4 V peak for alternating current, 60 V for continuous direct current. These products are intended primarily to provide power to low voltage, electrically operated devices.
1.2 These requirements cover products whose input power does not exceed 660 W under any possible
condition of output loading.
1.3 These requirements do not cover the effect that a power unit may have on the equipment or system
to which it is connected.
1.4 A product marked for a specific end-use (such as for use with audio-, radio-, or video-type equipment;
medical or dental equipment; or tools) may be subject to additional requirements found in the applicable end-product standard. See 51.4.
1.5 These requirements do not cover products intended to charge batteries for starter motors used to start engines. Products of this type are covered by the Standard for Battery Chargers for Charging
Engine-Starter Batteries, UL 1236.
1.6 These requirements cover Class 2 products, as defined in this standard, intended for use with toys. Products of this type shall also comply with the Standard for Toy Transformers, UL 697.
1.7 These requirements do not cover products with outputs other than Class 2, nor battery chargers
intended to charge batteries employed in wheel chairs or similar types of mobility aids. Products of this type are covered by the Standard for Power Units Other Than Class 2, UL 1012.
1.8 Products without a rectifier may be covered by the Standard for Low Voltage Transformers – Part 1:
General Requirements, UL 5085-1, and the Standard for Low Voltage Transformers – Part 3: Class 2 and
Class 3 Transformers, UL 5085-3.
1.9 These requirements do not cover products powered solely by a dc source. Products of this type are
covered by the Standard for Power Converters/Inverters and Power Converter/Inverter Systems for Land Vehicles and Marine Craft, UL 458, or by other requirements appropriate for the intended application.
1.10 These requirements do not cover products intended for supplying low voltage landscape lighting. Products of this type are covered by the Standard for Low Voltage Landscape Lighting Systems, UL 1838.