UL1310与UL1012的区别？
从标题上看：UL1310—Class 2 Power Units
UL1012—Power Units Other Than Class 2
从scope上看：
UL1310—These requirements cover indoor and outdoor use Class 2 power supplies and battery chargers.
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. 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 alternating current branch circuits with a
maximum potential of 150 V to ground;
b) Cord- and plug-connected units provided with a 15 or 20 A attachment plug configuration for
use on nominal 120 or 240 V alternating current branch circuits with a maximum potential of
150 V to ground; and
c) Units permanently connected to the input supply for use on nominal 600 V or less alternating
or direct current branch circuit.
Direct plug-in and cord-connected units may also be provided with an integral cigarette lighter connector
assembly, or a direct current input jack for being powered from a vehicle battery adapter or from a data
port associated with information technology equipment. 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.
UL1012—These requirements cover portable, stationary, and fixed power units having an input rating of 600
volts or less, direct- and alternating- current, with at least one output not marked Class 2, and that are
intended to be employed in ordinary locations in accordance with the National Electrical Code,
ANSI/NFPA 70.
但是，我怎么都分不清，什么是Class 2，哪位大哥解释一下？ CLASS Ⅱ插头是双插
CLASS Ⅰ插头是三插(含接第插)
CLASS 0Ⅰ插头虽是双插但要附接地线
如果电源模块是class II 电源，这可以用UL1310 来测试认证。class II 电源是指采用隔离型变压器，输出电压低于直流60伏， 电流小于150/Vmax安培的电源。 而对非class II电源， 则采用UL1012来测试认证。 class 2和classⅡ是不同的概念。
class 2电源最基本的要隔离变压器和功率不大于100W 引用第1楼lanfeiyuner于2010-06-08 09:18发表的:
如果电源模块是class II 电源，这可以用UL1310 来测试认证。class II 电源是指采用隔离型变压器，输出电压低于直流60伏， 电流小于150/Vmax安培的电源。 而对非class II电源， 则采用UL1012来测试认证。
你拿欧洲概念和我说美国标准，我更糊涂了。我查NFPA 70-2008的725.2 Definitions.如下：
Class 2 Circuit. The portion of the wiring system between
the load side of a Class 2 power source and the connected
equipment. Due to its power limitations, a Class 2 circuit
considers safety from a fire initiation standpoint and provides
acceptable protection from electric shock. 楼上正解，UL1310里面也有具体的定义 是不是输出高于60V 时就不能过UL1310了，如果输出高于60V如何过1012呢 class II是双重绝缘。
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