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引用第27楼barryyan于2008-08-18 17:39发表的 :
- h% ]* W$ ~6 B/ g5 v# g% ]# m) I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。。
1 R# L8 @1 ?! L5 w* ]) _5 a6 o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.( Q! K5 P: ~) h; p: }
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.4 Y5 X1 |8 I5 M) }+ ]; t4 t9 ~" y D
UL 60950, 2.6.3.3:$ X% n d( M! Z' t0 R
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The PROTECTIVE CURRENT RATING of the circuit (used in Table 2D and in the test of 2.6.3.4) depends* G' X+ l. N; I, I8 J- A7 Q4 A
on the provision and location of overcurrent protective devices. It shall be taken as the smallest X3 m# B+ S, z+ m8 \3 A' @
of a) or b) or c), as applicable.
4 r* ~' \4 t7 Z" c! Y I; Ma) For PLUGGABLE EQUIPMENT TYPE A, the PROTECTIVE CURRENT RATING is the rating of an
. E# S r4 u& ~0 s1 novercurrent protective device provided external to the equipment (for example, in the
" K/ R: U+ o9 C& T& F9 B" P, kbuilding wiring, in the mains plug or in an equipment rack) to protect the equipment,. {1 K+ H8 V3 B5 | [) A5 h
with a minimum of 16 A.. k6 e8 K; O7 d9 l& D W
NOTE 1 In most countries, 16 A is considered to be suitable as the PROTECTIVE CURRENT RATING of the circuit.7 \* |# N, `+ N2 g) s1 h K
NOTE 2 In Canada and United States, the PROTECTIVE CURRENT RATING of the circuit is taken as 20 A.
1 w& M% \+ B) a3 ]9 O- q- dNOTE 3 In the United Kingdom, the current rating of the circuit shall be taken as 13 A, not 16 A.0 S2 [9 G6 W3 D# I+ C: {
90 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 MARCH 27, 2007
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b) For PLUGGABLE EQUIPMENT TYPE B and PERMANENTLY CONNECTED EQUIPMENT (see 2.7.1), the
; S# n1 T1 b* z" E, X" \PROTECTIVE CURRENT RATING is the maximum rating of the overcurrent protective device
; F" z5 Z9 ]/ V( X% Fspecified in the equipment installation instructions to be provided external to the
% d% l# G) ]; N4 a( ]1 jequipment (see 1.7.2.3)./ X y1 r& R5 u2 R! l X
c) For any of the above equipment, the PROTECTIVE CURRENT RATING is the rating of an
( Q8 |" A: [9 i1 Z/ E/ fovercurrent protective device, if provided in or as part of the equipment, that protects$ |" g8 i* G: k; @# @6 P
the circuit or part required to be earthed. |
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发表于 2008-8-5 16:09
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