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发表于 2013-11-7 17:49
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jsspace 发表于 2013-11-7 17:36 2 \/ r6 \1 o# V4 t0 p
至少18AWG,请查看第6.9章节: ~$ ^" g$ b: `) A+ `
如果满足6.9.3, 或者6.9.4线径可减少 * O+ X# W2 l# D' \6 C( v
那UL153里面是不是任何线径都可以呢,我看到这样一条:
& }7 k4 J! u$ H& U' q) w/ |A conductor of a wire or cord shall be minimum 18 AWG (0.82 mm2) except where a smaller size
$ l8 ^* h, C9 tis permitted in (a) – (d) below:
5 u, K' ^5 Q; r- p1 ta) Internal wiring is permitted to be of any size provided it is adequately protected against
; t6 z2 Z7 F# @4 F# B' S! G1 e$ {overload or abnormal conditions by internal fusing and protected against mechanical damage by r$ Y% R# G! |/ X4 y
the enclosure, barriers, or routing.
: T8 n. ?5 K, [ T( o+ tb) A conductor in a Class 2 circuit shall be minimum 24 AWG (0.21 mm2).
( |; ?8 B+ m' H3 q, l3 {; O: [3 Vc) A permanently attached, completely enclosed, and maximum 6-inch (152-mm) long lead wire
$ S% z9 R6 f/ W7 f3 Vfor a clock motor or transformer shall be minimum 24 AWG (0.21 mm2), provided that stalling of; H) E3 m5 z: X) Z& ^* j- s
the clock motor or any abnormal or overload on the transformer secondary does not result in a
; T( i% ?& I4 M9 ^& p4 j9 ?risk of fire.3 L5 _/ l5 n, e+ o- E
d) Conductors for a series or series/parallel string of non-replaceable lights located within a% Z" M8 \# G4 ~) M/ ?
rigid housing which prevents moving or flexing of the conductors are permitted to be of any
% q: h( G4 H: O u# M3 B |size, provided that the portable luminaire complies with the Conductor Short Circuit and0 C( P+ V$ }1 X, K( N$ E) R4 ?
Abnormal Operation Test, Section 131A. |
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