灯具里面可以使用低于24AWG的内部导线吗？

tsunn

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& u9 T% ^2 l3 O' r: i+ ?
小于24AWG应该是不允许的。最小可以到24AWG。
楼上说了2108的15章写了最小24AWG，其实1598也写了最小只能到24AWG：
$ S/ D1 _6 {$ b9 n5 x' h2 PUL1598
6.9.3 Conductors of a size smaller than No. 18 AWG, but not smaller than No. 24 AWG, may be used
  Q( f3 U" o, W+ R! ^* |under the following conditions:
! n# v. ~) t' P% o+ N+ R4 I) |! D(a) where they are completely enclosed;
(b) where they are not subject to movement under normal use; and
(c) in the secondary of a transformer, or in a circuit using solid-state devices.

: O% ?; O9 C4 q4 m

依然

按照UL1598，小于2AWG的电线是可以用的，只要满足以下abc：
0 j7 l3 ?  r3 j' I2 k6.9.4 Conductors of a size smaller than 24 AWG (0.21 mm2) may be used under the following conditions:
(a) the conductors are in Class 2 power limited circuits only;
9 R3 L. p" N2 U" d) t. S) t(b) the current carrying capacity of the conductor is not exceeded and is sufficient to carry the
2 C! D1 a+ x+ N$ w3 U; k" C( ?continuous normal load current without any temperature related issues; and
(c) the construction complies with Item (1) or (2), as follows:

tsunn

依然 发表于 2013-6-24 09:13
按照UL1598，小于2AWG的电线是可以用的，只要满足以下abc：
/ Z( ~" S; W6 f% B6.9.4 Conductors of a size smaller than 24  ...

' e9 X! k, C* A. @我看的是2004版本的UL1598，没看到6.9.4有这样写，是不是有最新版的更改了。
我看到的是：6.9.4 A conductor or cord that can be flexed because of an adjustable, movable, or flexible part of a luminaire shall be of the stranded type and shall be secured so it will not be cut or abraded under
. k& d* |* c- I" sconditions of intended use, including relamping, servicing, and inspection of supply connections.

jsspace

tsunn 发表于 2013-6-24 10:21
我看的是2004版本的UL1598，没看到6.9.4有这样写，是不是有最新版的更改了。
, g5 k/ @2 \% m我看到的是：6.9.4 A condu ...

LZ的这个产品根本就不需要看UL1598， 看UL2108就可以了。
再说你手头上的2004的UL1598太老了，现在用的是2009年的了。

jjlamshushushu

看UL8750，输入是高压的，所以电线最小要18AWG的，输出线是低压的，要求最小24AWG

jsspace

jjlamshushushu 发表于 2013-6-24 10:38
4 b6 Q, B. k3 I6 A; e' ?' j看UL8750，输入是高压的，所以电线最小要18AWG的，输出线是低压的，要求最小24AWG

( U$ {+ U4 ^4 y可以小于24AWG，请参看UL8750-2012 第7.3.7章节
conductor of any size are permitted when the conductor are in class 2 or LVLE circuit.....

依然

( P( }/ `8 C! F' D对于class 2后面的电线，其实UL已经允许任何线径的电线使用了，大部分灯具标准中都已经做了修改。
5 Q: O+ w4 Q* v" Y* P' N
UL153（March 15, 2013修改）：
. R; T5 t# x( D; ^# Y. u27.1.1 A conductor of a wire or cord shall be minimum 18 AWG (0.82 mm2) except where a smaller size
! r9 {$ j5 {+ A9 f/ qis permitted in (a) – (d) below:
b) A conductor in a Class 2 circuit is permitted to be of any size.

UL8750 (7.3.7 revised October 17, 2012):
7.3.7 Conductors of any size are permitted when the conductors are in Class 2 or isolated LVLE circuits
only and are physically separated from all other non-Class 2 or non-isolated LVLE circuits, such as by a
7 |' g9 Z" ~& F2 s& v! y% fbarrier or reliably fixed spacing of minimum 6.4 mm (0.25 in).

UL2108（15.2 revised July 15, 2010）：
15.2 Conductors shall be 18 AWG (0.82 mm2) minimum.
! j1 o& [2 n4 O! o1 W5 TException No. 2: Conductors of any size are permitted when the conductors are in Class 2 or equivalent
) h  t, {/ C' Risolated low voltage, limited energy circuits only and are physically separated from all other non-Class 2
) y0 B! a  D6 V- ~9 hor non-isolated low voltage, limited energy circuits, such as by a barrier or reliably fixed spacing of
minimum 6.4 mm (0.25 in).
* d7 u: a9 u5 {  ZUL1598 （SEPTEMBER 17, 2008）
2 }/ d/ q: |7 z* v- q- C! I, K6.9.4 Conductors of a size smaller than 24 AWG (0.21 mm2) may be used under the following conditions:
(a) the conductors are in Class 2 power limited circuits only;

依然

大家对标准更新要及时关注，有些条款是很重要的

jsspace

tsunn 发表于 2013-6-24 10:21
我看的是2004版本的UL1598，没看到6.9.4有这样写，是不是有最新版的更改了。
/ d6 K5 i: r3 }  B6 m我看到的是：6.9.4 A condu ...

我什么都做BSMI, UL, CE, CQC, SAA，表示头大

切莫溪水

jsspace 发表于 2013-6-24 11:16
我什么都做BSMI, UL, CE, CQC, SAA，表示头大

跟着大家好好学习