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引用第27楼barryyan于2008-08-18 17:39发表的 :
) q9 U2 Z0 m* q8 Q6 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。。
! t2 D/ a* d+ h9 a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.
+ W5 h2 i# y' D' M+ n. M1 U20A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.
% _! S3 Q2 m/ j9 M5 ~UL 60950, 2.6.3.3:( }- V5 q- F; A8 i* ]8 @
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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
3 m* _5 y8 x7 e$ aon the provision and location of overcurrent protective devices. It shall be taken as the smallest7 w/ e5 W9 s% t1 Q- T
of a) or b) or c), as applicable.
2 j4 j0 i) ?8 J+ o8 p: La) For PLUGGABLE EQUIPMENT TYPE A, the PROTECTIVE CURRENT RATING is the rating of an
, S0 R% ^$ {6 Wovercurrent protective device provided external to the equipment (for example, in the& }4 f# o: u' U
building wiring, in the mains plug or in an equipment rack) to protect the equipment,
, X2 Q5 x# G, y7 }2 g* ]3 Uwith a minimum of 16 A./ u1 q9 N. W' \8 Y" B
NOTE 1 In most countries, 16 A is considered to be suitable as the PROTECTIVE CURRENT RATING of the circuit.
1 K: f* u- Y2 y6 z* lNOTE 2 In Canada and United States, the PROTECTIVE CURRENT RATING of the circuit is taken as 20 A.5 R! f- |. v6 g: V# k" Y2 o
NOTE 3 In the United Kingdom, the current rating of the circuit shall be taken as 13 A, not 16 A.
+ G0 ]6 `% O: \$ Y6 J1 @; F90 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
- ^5 I3 u1 X- q9 f2 R# _PROTECTIVE CURRENT RATING is the maximum rating of the overcurrent protective device
6 K% a/ k c, g% A: T$ qspecified in the equipment installation instructions to be provided external to the
( ^5 U( @1 y' k8 M. Lequipment (see 1.7.2.3).
# I- d/ k/ N# Vc) For any of the above equipment, the PROTECTIVE CURRENT RATING is the rating of an0 ~! ~ U G7 o" Y5 V# }/ t
overcurrent protective device, if provided in or as part of the equipment, that protects2 j. l m3 D5 Q
the circuit or part required to be earthed. |
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