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。
( v* Q0 o  G' k6 ?. X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：
- Y+ E8 c0 j; N  qUL1598
6.9.3 Conductors of a size smaller than No. 18 AWG, but not smaller than No. 24 AWG, may be used
! |5 L' x# M2 z! Iunder the following conditions:
(a) where they are completely enclosed;
: |; U- `  O' j) b% w9 M(b) where they are not subject to movement under normal use; and
$ g5 d' h0 i3 ], L/ B0 q(c) in the secondary of a transformer, or in a circuit using solid-state devices.

3 b/ f- D% Z1 g

依然

按照UL1598，小于2AWG的电线是可以用的，只要满足以下abc：
% {1 B2 Q! @( D' y6.9.4 Conductors of a size smaller than 24 AWG (0.21 mm2) may be used under the following conditions:
4 S5 ?* z, J/ b( Z) K(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
  P, z" E6 W- p3 k( e(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：
" I7 N2 ?$ t+ }) N+ _8 J% ?; [6.9.4 Conductors of a size smaller than 24  ...

' a% f+ |7 {+ P# f1 T2 U4 e$ R. K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。
# Q& A4 M1 @8 [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
conditions of intended use, including relamping, servicing, and inspection of supply connections.

jsspace

tsunn 发表于 2013-6-24 10:21
, q/ ?& T: n  ^$ _1 T1 `% t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 ...

* f- g; V1 H, U* p( rLZ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。
; @, h+ O+ w" A4 d/ l  o

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
+ R3 g9 a4 a) L- K' x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

' t; d) z% A8 d# J7 K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

6 ^2 T* b' N& {3 w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）：
27.1.1 A conductor of a wire or cord shall be minimum 18 AWG (0.82 mm2) except where a smaller size
2 G+ i1 q& B) |. |% xis permitted in (a) – (d) below:
b) A conductor in a Class 2 circuit is permitted to be of any size.
! d7 q8 I7 _' c5 J/ J5 Q3 R- r
UL8750 (7.3.7 revised October 17, 2012):
' B$ V$ [% D" t; I1 C- Z4 O7.3.7 Conductors of any size are permitted when the conductors are in Class 2 or isolated LVLE circuits
% ]( N, \: T, A, _) ]# ?3 Uonly 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).

2 d" n6 R  m3 Z# _5 uUL2108（15.2 revised July 15, 2010）：
6 N! V6 o, n6 v) ~1 S3 }15.2 Conductors shall be 18 AWG (0.82 mm2) minimum.
8 @* ~2 s. l/ d+ PException No. 2: Conductors of any size are permitted when the conductors are in Class 2 or equivalent
) }; T+ c( f+ E) f. bisolated 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
  c4 |0 S  x9 e7 E3 R  z$ w+ u1 Fminimum 6.4 mm (0.25 in).
, _; v5 |- T7 Q: @, y& R3 RUL1598 （SEPTEMBER 17, 2008）
6.9.4 Conductors of a size smaller than 24 AWG (0.21 mm2) may be used under the following conditions:
1 @5 U; r  _5 s4 \. C2 Y( p(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。
% N2 j) ^7 w6 v; s( y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
& }% R  z2 _0 O( q6 F  L: ~; s" V我什么都做BSMI, UL, CE, CQC, SAA，表示头大

跟着大家好好学习