灯具里面可以使用低于24AWG的内部导线吗？

tsunn

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, i; r# x+ s8 w
) ^, O  q9 `& F- o2 L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：
5 C9 P; @5 H1 y7 K. [6 D3 l! L) l  uUL1598
: p/ [( Q/ Q! r3 I1 R& F( F$ a6.9.3 Conductors of a size smaller than No. 18 AWG, but not smaller than No. 24 AWG, may be used
) I+ U7 P6 X1 G+ `under the following conditions:
(a) where they are completely enclosed;
(b) where they are not subject to movement under normal use; and
0 ^& S& }& ^% l2 C' k( \5 l(c) in the secondary of a transformer, or in a circuit using solid-state devices.
% K1 z$ I: L! N0 k2 r) _6 N
, ]* L, y: s, @4 i# @

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:
, z: t, b9 R- r(a) the conductors are in Class 2 power limited circuits only;
* R" {) Z: W! E' a(b) the current carrying capacity of the conductor is not exceeded and is sufficient to carry the
' E; O* s' n3 y+ C/ bcontinuous 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
  T% q; S% ?4 B2 M  r4 y, q1 g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  ...

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。
- \6 z% F% N. S  S7 {0 W( N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 {: Q% t5 c' j6 P9 w. B' z" c) Uconditions 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。
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。
6 S& f! s+ m: @1 q. M

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
0 b7 T1 m/ t" i% j0 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

可以小于24AWG，请参看UL8750-2012 第7.3.7章节
# L$ I8 \: e- {) e$ ~conductor of any size are permitted when the conductor are in class 2 or LVLE circuit.....

依然

% m3 r1 Q" F2 u# N3 u; M( v' ~9 R" I; 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）：
( |' ]6 Q3 m& `6 x+ i8 X27.1.1 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:
4 @0 e, J7 |& v1 k! Qb) A conductor in a Class 2 circuit is permitted to be of any size.
. b4 ^, p" k3 O6 f/ I
3 V; }, S( `5 Q6 }" e3 c( GUL8750 (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
8 r3 l1 [* n  Q! O+ w, A9 V% [+ Fbarrier or reliably fixed spacing of minimum 6.4 mm (0.25 in).

: C  ?! _4 K! J! c; KUL2108（15.2 revised July 15, 2010）：
, G# `9 A( {3 ]% i# Z( `$ `# B15.2 Conductors shall be 18 AWG (0.82 mm2) minimum.
9 G8 u) k0 Y5 z5 q: X  H/ RException No. 2: Conductors of any size are permitted when the conductors are in Class 2 or equivalent
, F$ O( t( w; T  C9 `0 Cisolated low voltage, limited energy circuits only and are physically separated from all other non-Class 2
( P3 y3 T0 G) c5 b1 d7 A0 Por non-isolated low voltage, limited energy circuits, such as by a barrier or reliably fixed spacing of
5 x/ s! N) `* D, M4 gminimum 6.4 mm (0.25 in).
! w$ o6 @% u" Y$ bUL1598 （SEPTEMBER 17, 2008）
; c& Y1 N7 L/ ?: B8 U9 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
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。
3 |1 O; C) 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
我什么都做BSMI, UL, CE, CQC, SAA，表示头大

跟着大家好好学习