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引用第27楼barryyan于2008-08-18 17:39发表的 :& e$ B: B' U# }9 X: J) A
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。。
* f/ A1 Z2 N/ k. ]: y5 g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.4 M* g; }! Q6 P" P( O
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.' t5 m, a# `, C4 Z4 ^
UL 60950, 2.6.3.3:
% M: _$ b8 ]4 U+ ^, _( x; i g
+ `9 N) ~. C# KThe PROTECTIVE CURRENT RATING of the circuit (used in Table 2D and in the test of 2.6.3.4) depends
$ I# P+ }7 B( E& A E6 Pon the provision and location of overcurrent protective devices. It shall be taken as the smallest u- z: _5 x$ c
of a) or b) or c), as applicable.3 O8 M# f7 S, K; R B: q- c% z
a) For PLUGGABLE EQUIPMENT TYPE A, the PROTECTIVE CURRENT RATING is the rating of an9 P; O( x1 l0 V1 Y7 F& [$ |
overcurrent protective device provided external to the equipment (for example, in the
* p d+ w# d7 i5 {8 Nbuilding wiring, in the mains plug or in an equipment rack) to protect the equipment,
7 t) X5 {, s0 ^' U5 zwith a minimum of 16 A.
0 t8 K: ?7 q! y' z% F- oNOTE 1 In most countries, 16 A is considered to be suitable as the PROTECTIVE CURRENT RATING of the circuit.$ z( j: d# b& ~! O% {2 @
NOTE 2 In Canada and United States, the PROTECTIVE CURRENT RATING of the circuit is taken as 20 A.
7 g" d* Y1 K" ]NOTE 3 In the United Kingdom, the current rating of the circuit shall be taken as 13 A, not 16 A.
0 S1 ~6 n( Z2 L2 \; }7 v6 S/ F. q- R90 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 MARCH 27, 2007
% q! {# T# w& UNAE0 j4 n8 E3 D3 [4 V( A+ a
b) For PLUGGABLE EQUIPMENT TYPE B and PERMANENTLY CONNECTED EQUIPMENT (see 2.7.1), the
) u; W0 d& O, F5 ZPROTECTIVE CURRENT RATING is the maximum rating of the overcurrent protective device; R% y8 G* ^ r: J8 B
specified in the equipment installation instructions to be provided external to the0 x8 K$ `" n* ^
equipment (see 1.7.2.3).1 M2 m6 [7 k& j: M
c) For any of the above equipment, the PROTECTIVE CURRENT RATING is the rating of an
" I3 ]0 E9 `3 h" k' E; n/ Iovercurrent protective device, if provided in or as part of the equipment, that protects
( k9 L4 H( J& d" r2 @the circuit or part required to be earthed. |
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