灯具里面可以使用低于24AWG的内部导线吗？

tsunn

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: |! H% w7 p; f% {
小于24AWG应该是不允许的。最小可以到24AWG。
3 h8 Y$ e+ z6 l- y3 p! P( ?+ E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
8 Z8 b& n9 u/ j9 y$ w6.9.3 Conductors of a size smaller than No. 18 AWG, but not smaller than No. 24 AWG, may be used
under the following conditions:
2 Q# {. Q5 \% Y- Y( ]+ T(a) where they are completely enclosed;
6 s! c4 Z# |0 N% d$ b2 _5 P(b) where they are not subject to movement under normal use; and
1 [6 y  k! L/ }(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
  ]) A" a: Y; t6 ^(c) the construction complies with Item (1) or (2), as follows:

tsunn

依然 发表于 2013-6-24 09:13
/ O& Y: z) m- V4 w- W; F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  ...

% A  v' e4 b  l5 X+ _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
* \9 w* p0 Y5 B; D, Xconditions 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。
9 l7 a5 N3 S  X/ F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。
+ Z, t& E) e/ U/ x; }9 v3 ~  w! Q1 }

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
2 y6 c' o1 F; r- w. ?* m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

可以小于24AWG，请参看UL8750-2012 第7.3.7章节
) p$ ^4 y/ a) d3 z# g3 S3 N3 |, u5 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。

UL153（March 15, 2013修改）：
# V- ^1 B+ c' l$ f0 \5 ^5 C27.1.1 A conductor of a wire or cord shall be minimum 18 AWG (0.82 mm2) except where a smaller size
$ o% T, _" P9 z9 bis permitted in (a) – (d) below:
# X9 T+ b8 K  n" c! w/ }9 Gb) A conductor in a Class 2 circuit is permitted to be of any size.

) m9 O& h. e! U& QUL8750 (7.3.7 revised October 17, 2012):
; E& z) m1 L1 w, R7.3.7 Conductors of any size are permitted when the conductors are in Class 2 or isolated LVLE circuits
2 ?8 o. Q& W* yonly 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）：
4 [" ~. u% d/ Q: q  P2 |15.2 Conductors shall be 18 AWG (0.82 mm2) minimum.
! @+ c* s' J  c& l- y0 i' h3 iException No. 2: Conductors of any size are permitted when the conductors are in Class 2 or equivalent
isolated 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
8 l, D  I, ^; Pminimum 6.4 mm (0.25 in).
UL1598 （SEPTEMBER 17, 2008）
6.9.4 Conductors of a size smaller than 24 AWG (0.21 mm2) may be used under the following conditions:
8 w3 E# [# l- l; b8 `4 {+ y) s(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
( t* P3 A5 I  U. {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 condu ...

6 w- y0 {" n: c4 v3 t& k7 M* h" V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
, n% x% K& j4 M' D0 O9 ~9 L我什么都做BSMI, UL, CE, CQC, SAA，表示头大

跟着大家好好学习