UL目击实验室WTDP的circuit breaker
我们也碰到了这个问题！但后来用了较简单的方法实现了！其实用什么器件不是最主要的，重要的是达到的效果要符合UL的要求。嘿嘿！ 学习，原来真不知道 请问：WTDP所使用的断路器必须是20A的吗？在进行120/240V 20A的测试时，由于是20A的断路器，感觉很容易就跳开了，导致审核无法进行。。 怎么没人回答：
WTDP所使用的断路器必须是20A的吗？在进行120/240V 20A的测试时，由于是20A的断路器，感觉很容易就跳开了，导致审核无法进行。。 引用第27楼barryyan于2008-08-18 17:39发表的:
请问：WTDP所使用的断路器必须是20A的吗？在进行120/240V 20A的测试时，由于是20A的断路器，感觉很容易就跳开了，导致审核无法进行。。
它要求的是20A带载, 主要是模仿美洲的电路系统. 见标准写的一段话.
20A短路是很容易跳开的,所以你一定要明白,这个Breaker是用来做什么的.
UL 60950, 2.6.3.3:
The PROTECTIVE CURRENT RATING of the circuit (used in Table 2D and in the test of 2.6.3.4) depends
on the provision and location of overcurrent protective devices. It shall be taken as the smallest
of a) or b) or c), as applicable.
a) For PLUGGABLE EQUIPMENT TYPE A, the PROTECTIVE CURRENT RATING is the rating of an
overcurrent protective device provided external to the equipment (for example, in the
building wiring, in the mains plug or in an equipment rack) to protect the equipment,
with a minimum of 16 A.
NOTE 1 In most countries, 16 A is considered to be suitable as the PROTECTIVE CURRENT RATING of the circuit.
NOTE 2 In Canada and United States, the PROTECTIVE CURRENT RATING of the circuit is taken as 20 A.
NOTE 3 In the United Kingdom, the current rating of the circuit shall be taken as 13 A, not 16 A.
90 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 MARCH 27, 2007
NAE
b) For PLUGGABLE EQUIPMENT TYPE B and PERMANENTLY CONNECTED EQUIPMENT (see 2.7.1), the
PROTECTIVE CURRENT RATING is the maximum rating of the overcurrent protective device
specified in the equipment installation instructions to be provided external to the
equipment (see 1.7.2.3).
c) For any of the above equipment, the PROTECTIVE CURRENT RATING is the rating of an
overcurrent protective device, if provided in or as part of the equipment, that protects
the circuit or part required to be earthed.
