灯具里面可以使用低于24AWG的内部导线吗？

tsunn

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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：
UL1598
6.9.3 Conductors of a size smaller than No. 18 AWG, but not smaller than No. 24 AWG, may be used
( |5 [% b2 i- Y0 \2 \2 K7 Z4 d4 k7 Ounder the following conditions:
(a) where they are completely enclosed;
. {: ~9 F1 A( ^- f(b) where they are not subject to movement under normal use; and
. v4 O$ }1 V' Z, L6 `(c) in the secondary of a transformer, or in a circuit using solid-state devices.

依然

按照UL1598，小于2AWG的电线是可以用的，只要满足以下abc：
6.9.4 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;
(b) the current carrying capacity of the conductor is not exceeded and is sufficient to carry the
continuous normal load current without any temperature related issues; and
+ K/ u: t7 m' v' t0 H) H(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：
6.9.4 Conductors of a size smaller than 24  ...

" P2 n- v: s- e! X) ^: n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
) V/ K$ X" J* E) n6 Aconditions 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。
8 w9 U- x# c1 W% c* O" z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
( p8 a1 {: C8 w: G6 ~) R. a( 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

8 n6 t0 M+ G8 A5 P3 w可以小于24AWG，请参看UL8750-2012 第7.3.7章节
$ n9 T/ \- X5 G- ]6 z) bconductor of any size are permitted when the conductor are in class 2 or LVLE circuit.....

依然

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。
0 b/ W7 p) g" H. t7 `$ E
6 E/ K8 l* b1 |, K1 X5 dUL153（March 15, 2013修改）：
+ j/ e7 Z  G1 _# A( v: I27.1.1 A conductor of a wire or cord shall be minimum 18 AWG (0.82 mm2) except where a smaller size
is permitted in (a) – (d) below:
' P5 y6 i7 M4 eb) A conductor in a Class 2 circuit is permitted to be of any size.
7 s8 l: `- J% O
8 A$ K0 \) a/ J/ FUL8750 (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
# G, Z! v! |9 s1 i. ?only and are physically separated from all other non-Class 2 or non-isolated LVLE circuits, such as by a
barrier 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.
+ T& i7 Z5 v% c0 `& F# {9 YException No. 2: Conductors of any size are permitted when the conductors are in Class 2 or equivalent
% @' d+ Z* j, L5 w* R7 F3 u0 Wisolated low voltage, limited energy circuits only and are physically separated from all other non-Class 2
or non-isolated low voltage, limited energy circuits, such as by a barrier or reliably fixed spacing of
minimum 6.4 mm (0.25 in).
UL1598 （SEPTEMBER 17, 2008）
: H4 Y" C+ G: p0 `. H6.9.4 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
; C+ V. _. ^$ b0 @1 |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。
; P( {3 v  K; K1 L/ H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
7 V$ S) U' h0 Y, e9 p2 v6 O9 [; y我什么都做BSMI, UL, CE, CQC, SAA，表示头大

跟着大家好好学习