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引用第27楼barryyan于2008-08-18 17:39发表的 :
7 a6 b6 j7 u, i& ^3 {( T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.
$ g% R, N/ s Z20A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.- Q) a# t/ ~7 K* y- |
UL 60950, 2.6.3.3:
2 A J9 l4 ^9 ?& n4 a0 G
: w) W/ v! e% t: mThe PROTECTIVE CURRENT RATING of the circuit (used in Table 2D and in the test of 2.6.3.4) depends& V8 u; u& a- @. W4 r# Q) `5 A
on the provision and location of overcurrent protective devices. It shall be taken as the smallest
( e9 } y: [# \& T h sof a) or b) or c), as applicable., p% @7 V3 X d; p8 B1 g, _
a) For PLUGGABLE EQUIPMENT TYPE A, the PROTECTIVE CURRENT RATING is the rating of an
! j- q9 A- T( uovercurrent protective device provided external to the equipment (for example, in the; I( O' v3 K8 y+ `5 x
building wiring, in the mains plug or in an equipment rack) to protect the equipment,; ]; T O/ Y7 Z: [! k7 m
with a minimum of 16 A.
5 {# g" O9 c# B4 k3 Y/ h+ BNOTE 1 In most countries, 16 A is considered to be suitable as the PROTECTIVE CURRENT RATING of the circuit.$ _/ ]: H- t' d5 R/ a
NOTE 2 In Canada and United States, the PROTECTIVE CURRENT RATING of the circuit is taken as 20 A.
) F: U! C6 f3 @2 G M4 BNOTE 3 In the United Kingdom, the current rating of the circuit shall be taken as 13 A, not 16 A.
# x# [& z8 u; P) X+ a- L90 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 MARCH 27, 2007
1 C2 S' i* f# XNAE
2 h2 [2 P j: ~& W+ M5 F" ab) For PLUGGABLE EQUIPMENT TYPE B and PERMANENTLY CONNECTED EQUIPMENT (see 2.7.1), the
4 |0 A& t2 U- ~+ l8 vPROTECTIVE CURRENT RATING is the maximum rating of the overcurrent protective device
1 Z/ w8 K. w8 p0 @specified in the equipment installation instructions to be provided external to the g" k5 F0 ^) ~0 ~1 W9 l" }* V, K
equipment (see 1.7.2.3).
) a( k* m( r5 J# pc) For any of the above equipment, the PROTECTIVE CURRENT RATING is the rating of an: N- X8 Y& d1 N/ X; D1 u
overcurrent protective device, if provided in or as part of the equipment, that protects' P& k l$ T2 V
the circuit or part required to be earthed. |
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发表于 2008-8-5 16:09
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