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引用第27楼barryyan于2008-08-18 17:39发表的 :4 M( A7 K" J* @/ |! k8 F" Z6 f
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.
& l7 M! y0 K' h# i# @7 y3 f0 R20A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.' d! ?! d K) l& u% i
UL 60950, 2.6.3.3:8 J7 x! U2 Q4 N w. m. B. J! D
- ]6 {/ s) T! Y+ L2 Y
The PROTECTIVE CURRENT RATING of the circuit (used in Table 2D and in the test of 2.6.3.4) depends$ G% g @2 S+ P
on the provision and location of overcurrent protective devices. It shall be taken as the smallest
% ~: M, s, ?1 h+ k, Wof a) or b) or c), as applicable.# ~7 w7 M- x" A( n! M
a) For PLUGGABLE EQUIPMENT TYPE A, the PROTECTIVE CURRENT RATING is the rating of an) {/ R- {/ F) l' j' U- ?
overcurrent protective device provided external to the equipment (for example, in the x2 e I2 d; b3 \ |5 n0 I. \
building wiring, in the mains plug or in an equipment rack) to protect the equipment,; c# J! g P& u. ^. B) {) P$ |7 Q
with a minimum of 16 A.
- f( V" b+ ~* u; P+ ~ \NOTE 1 In most countries, 16 A is considered to be suitable as the PROTECTIVE CURRENT RATING of the circuit.( Y) K9 ^' `3 ^9 k {" y/ D2 C
NOTE 2 In Canada and United States, the PROTECTIVE CURRENT RATING of the circuit is taken as 20 A.
% a% M, ]* B9 O7 N8 ^3 sNOTE 3 In the United Kingdom, the current rating of the circuit shall be taken as 13 A, not 16 A.
2 E! @& n } \ _& q' Y90 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 MARCH 27, 2007
5 q0 |: ^' t6 S# }" H+ ANAE+ f- k- z* t* n! M' {, B$ G- H7 C; L% T. v
b) For PLUGGABLE EQUIPMENT TYPE B and PERMANENTLY CONNECTED EQUIPMENT (see 2.7.1), the
1 N: i* l& Z+ A/ D5 i7 WPROTECTIVE CURRENT RATING is the maximum rating of the overcurrent protective device1 E! L3 n' E$ z8 |9 m/ m) z
specified in the equipment installation instructions to be provided external to the8 h! y/ R+ d" I- Q5 Z& v( q
equipment (see 1.7.2.3).
6 p9 A6 j- Q- u; @* Gc) For any of the above equipment, the PROTECTIVE CURRENT RATING is the rating of an6 }5 N3 H% k6 l+ h
overcurrent protective device, if provided in or as part of the equipment, that protects
. x0 o R m+ V w) o g( J" {the circuit or part required to be earthed. |
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发表于 2008-8-5 16:09
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