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引用第27楼barryyan于2008-08-18 17:39发表的 : q: O4 s3 c: g3 O$ `$ U
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。。
/ {, L# M. c Y- 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.% z9 u# |4 r) O0 p0 e* J! ]
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.* f( m4 i) K/ M. G0 ]5 A3 j5 f
UL 60950, 2.6.3.3:9 e, r6 r' ?& E) z0 x+ {7 \
0 C: [+ I1 r) V6 ]5 ?0 w5 }
The PROTECTIVE CURRENT RATING of the circuit (used in Table 2D and in the test of 2.6.3.4) depends" G% S9 x: h! `6 o
on the provision and location of overcurrent protective devices. It shall be taken as the smallest
$ F4 H7 j0 S) ^" B# E. c+ aof a) or b) or c), as applicable.0 z8 o! i) `$ W j& ]% m1 m7 E
a) For PLUGGABLE EQUIPMENT TYPE A, the PROTECTIVE CURRENT RATING is the rating of an
+ p O7 Z. [& p# zovercurrent protective device provided external to the equipment (for example, in the
' X1 ?" o5 K5 ?building wiring, in the mains plug or in an equipment rack) to protect the equipment,. W3 o/ ~! h; a1 T& B
with a minimum of 16 A.( Q3 T5 m* Z9 f. a. r' g; c( U
NOTE 1 In most countries, 16 A is considered to be suitable as the PROTECTIVE CURRENT RATING of the circuit.1 x9 X9 l4 U0 v: W6 x
NOTE 2 In Canada and United States, the PROTECTIVE CURRENT RATING of the circuit is taken as 20 A. A/ S5 k5 L6 `( G7 N. p/ D, s# s+ v
NOTE 3 In the United Kingdom, the current rating of the circuit shall be taken as 13 A, not 16 A.
}$ x, `; i7 p9 n90 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 MARCH 27, 2007
; ?+ s2 ^7 ]6 c; oNAE/ e* c7 U" N4 Z+ O
b) For PLUGGABLE EQUIPMENT TYPE B and PERMANENTLY CONNECTED EQUIPMENT (see 2.7.1), the. b/ C! u/ ~& [- T5 }9 j
PROTECTIVE CURRENT RATING is the maximum rating of the overcurrent protective device
0 X' q9 D; s) U! pspecified in the equipment installation instructions to be provided external to the
- ]( ]/ p- D9 J9 Yequipment (see 1.7.2.3).
+ G% j' j5 |+ a- Q; w+ J1 [c) For any of the above equipment, the PROTECTIVE CURRENT RATING is the rating of an
- H4 l$ E# ~, C2 b5 L+ T0 Vovercurrent protective device, if provided in or as part of the equipment, that protects. _: I) Y/ f; t0 j+ `9 n+ N
the circuit or part required to be earthed. |
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发表于 2008-8-5 16:09
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