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引用第27楼barryyan于2008-08-18 17:39发表的 :' c* @9 n5 F$ A% k- W6 u: }
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。。
, ]4 v5 \! f+ n0 I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.
" x: g3 }0 F" j( k0 I% m20A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.
1 G* B; {9 ~* o6 K5 [4 {UL 60950, 2.6.3.3:
9 h6 T2 W9 Q# ~# H
, M/ W7 A! I% S3 LThe PROTECTIVE CURRENT RATING of the circuit (used in Table 2D and in the test of 2.6.3.4) depends
7 I# @: H& E c/ _: ~on the provision and location of overcurrent protective devices. It shall be taken as the smallest. O& G! @/ K& q3 ^$ A9 b
of a) or b) or c), as applicable.
- R5 q3 O+ d+ [9 U: S% X; }a) For PLUGGABLE EQUIPMENT TYPE A, the PROTECTIVE CURRENT RATING is the rating of an
% Y' R1 W. G' J. i8 hovercurrent protective device provided external to the equipment (for example, in the
$ p9 O( r3 e; b. D Wbuilding wiring, in the mains plug or in an equipment rack) to protect the equipment,
( e* }9 R. j2 Wwith a minimum of 16 A.
4 n; P# p i1 W( s2 _5 LNOTE 1 In most countries, 16 A is considered to be suitable as the PROTECTIVE CURRENT RATING of the circuit.
: J- a. G( _1 c' UNOTE 2 In Canada and United States, the PROTECTIVE CURRENT RATING of the circuit is taken as 20 A.
$ L2 _/ F. ^! `; W, FNOTE 3 In the United Kingdom, the current rating of the circuit shall be taken as 13 A, not 16 A.' a: y, D4 x% A1 i( z
90 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 MARCH 27, 2007
C, z+ j- V' i7 U9 s# y' D; wNAE
+ N& W, u# x6 _! m' }b) For PLUGGABLE EQUIPMENT TYPE B and PERMANENTLY CONNECTED EQUIPMENT (see 2.7.1), the
+ D! q7 c: Y+ x, x- D! P+ x4 i3 \PROTECTIVE CURRENT RATING is the maximum rating of the overcurrent protective device9 S. t( _ Z# [% Z
specified in the equipment installation instructions to be provided external to the, O) ]8 U4 Y+ @9 e1 q. d/ |
equipment (see 1.7.2.3).: m3 u4 y) [) E0 t
c) For any of the above equipment, the PROTECTIVE CURRENT RATING is the rating of an
( \* d5 n6 o: m/ ]2 Vovercurrent protective device, if provided in or as part of the equipment, that protects
+ h# S2 r: k* O0 U9 S. dthe circuit or part required to be earthed. |
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