|
|
引用第27楼barryyan于2008-08-18 17:39发表的 :
! f2 N; Z+ t" V2 ]5 o& r; }1 E& _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.9 w4 B& Q& K4 y7 I3 O; 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., C7 u) |( R, m6 u; f4 v
UL 60950, 2.6.3.3:# M4 L: O9 u* k2 y- G6 N
+ H& F$ U6 g+ u! O% H
The PROTECTIVE CURRENT RATING of the circuit (used in Table 2D and in the test of 2.6.3.4) depends8 `) f6 b' j/ u' `9 O. S5 ~
on the provision and location of overcurrent protective devices. It shall be taken as the smallest+ t/ L0 {, z B2 L7 a7 g
of a) or b) or c), as applicable.9 y! E# N- N7 |% d) c+ U. r
a) For PLUGGABLE EQUIPMENT TYPE A, the PROTECTIVE CURRENT RATING is the rating of an# Q! z1 _& v, h+ X+ F
overcurrent protective device provided external to the equipment (for example, in the/ ]& B" w& E) I3 W+ S8 Q9 J# A
building wiring, in the mains plug or in an equipment rack) to protect the equipment,
0 D6 D5 ]+ w% H! V7 h" Lwith a minimum of 16 A., A, t. x8 u, s6 H
NOTE 1 In most countries, 16 A is considered to be suitable as the PROTECTIVE CURRENT RATING of the circuit./ @3 {. n' u8 f' H
NOTE 2 In Canada and United States, the PROTECTIVE CURRENT RATING of the circuit is taken as 20 A.2 `* I4 z$ [+ M. Q5 l: C
NOTE 3 In the United Kingdom, the current rating of the circuit shall be taken as 13 A, not 16 A.
8 L: z3 f. }5 A1 _+ c90 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 MARCH 27, 2007
* P+ N8 x6 y4 E- s9 wNAE
! c. k1 Y# P$ V; }7 Ub) For PLUGGABLE EQUIPMENT TYPE B and PERMANENTLY CONNECTED EQUIPMENT (see 2.7.1), the
* M% H# I; R2 f% Z2 VPROTECTIVE CURRENT RATING is the maximum rating of the overcurrent protective device [0 ]* S* f! K* }7 p. ` @+ k
specified in the equipment installation instructions to be provided external to the
" Z9 m5 g) R5 k* y# c. @3 i: w1 s5 iequipment (see 1.7.2.3).3 f* j* N. _: w5 h& A/ }* s
c) For any of the above equipment, the PROTECTIVE CURRENT RATING is the rating of an9 r* D: F- G+ ^7 {- }( N& W
overcurrent protective device, if provided in or as part of the equipment, that protects9 A) T" S: e/ ~# k7 d6 [
the circuit or part required to be earthed. |
|
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 )
窥视卡
雷达卡
发表于 2008-8-5 16:09
显身卡