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引用第27楼barryyan于2008-08-18 17:39发表的 :4 i1 X$ W. q* N) L6 B" W
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.) ~2 u# P6 t7 m( J5 F% E
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.3 \) j9 z2 G- t9 ?1 T+ N8 |- \8 e
UL 60950, 2.6.3.3:
+ o1 g, X! `- |7 v& G; ~& P, N2 Q2 ~) j" C: y- y
The PROTECTIVE CURRENT RATING of the circuit (used in Table 2D and in the test of 2.6.3.4) depends
) e8 E, Q2 D) R7 Won the provision and location of overcurrent protective devices. It shall be taken as the smallest
6 ` _/ S. w5 z$ l0 lof a) or b) or c), as applicable.
$ A O! Y( J$ p |$ F; g8 W* y. @a) For PLUGGABLE EQUIPMENT TYPE A, the PROTECTIVE CURRENT RATING is the rating of an1 |" Z4 d: ~" R' h5 J
overcurrent protective device provided external to the equipment (for example, in the. ?3 P% Q' f- D0 F! S1 V
building wiring, in the mains plug or in an equipment rack) to protect the equipment,2 @3 L- h4 s4 Q' d( g' p B y: y
with a minimum of 16 A.5 K8 V+ x. D7 B& G( ~: ?
NOTE 1 In most countries, 16 A is considered to be suitable as the PROTECTIVE CURRENT RATING of the circuit.$ q7 a% P1 C6 u! q) H( o m% g
NOTE 2 In Canada and United States, the PROTECTIVE CURRENT RATING of the circuit is taken as 20 A.
% X6 M1 u4 Q5 d, r$ n! A* M- h2 fNOTE 3 In the United Kingdom, the current rating of the circuit shall be taken as 13 A, not 16 A.$ E+ d2 i8 Y1 I' C8 L& `
90 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 MARCH 27, 20076 i8 M; v& C: x$ I7 _
NAE
2 N2 i& J+ k4 y* X- eb) For PLUGGABLE EQUIPMENT TYPE B and PERMANENTLY CONNECTED EQUIPMENT (see 2.7.1), the
0 e; s/ S) W u* j5 Z2 W& a! ePROTECTIVE CURRENT RATING is the maximum rating of the overcurrent protective device# s4 z. `, N3 w5 O6 c" j. d
specified in the equipment installation instructions to be provided external to the
1 }3 E. ~5 {2 n. O* F2 J5 }5 wequipment (see 1.7.2.3).8 \% Y, |5 @3 ^' C- E8 A
c) For any of the above equipment, the PROTECTIVE CURRENT RATING is the rating of an" w. k4 V: p6 I9 y0 Q( `5 }4 _
overcurrent protective device, if provided in or as part of the equipment, that protects4 f0 i9 k7 m/ E- ]! }7 }- }
the circuit or part required to be earthed. |
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