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關於車載充電器UL2089,閱讀在條文中有提到對線材的規定:( Q- f# g% Q5 l: u
1. 只查到Clause 12 Flexible Cords有一些對線材的明確要求,規定了線材型號/長度和AWG Size Table 12.1;
; J1 B" Y2 R5 ~; s 另外在Clause 12.1下的兩項Exception No.1 and No. 2;
[+ p4 y% l6 g. {' `% f12.1 A unit shall be provided with a flexible cord and shall be type SP-2, SPE-2, SPT-2, SV, SVE, SVT, S, SE, SO, SP-3, SPT-3, ST, STO, SJ, SJE, SJO, SJT, or SJTO. The length of cord external to the unit and including the cigarette lighter connector shall not be less than 3 ft (0.9 m) as measured from the end of the cigarette lighter connector to the point of attachment or entry. Cord AWG size shall be in accordance with Table 12.1.; j/ @: A' O. n4 n1 R" `
Exception No. 1: Output wiring for Class 2 or Low Voltage Limited Energy circuits may be parallel cord insulated with rubber, neoprene, or thermoplastic having a wall thickness of not less than 0.013 in (0.33 mm).( h) q8 I, j4 u5 y( I0 |+ W7 c1 t- ?
Exception No. 2: For units rated 10 A or less, an equivalent style appliance wiring material (AWM) may be employed.
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; V5 d3 Q0 D+ N: u5 xTable 12.1 Cord sizes
1 A. A O/ u9 yAdapter input fuse rating, Amps Minimum cord conductor size, AWG
1 n- r' @. t4 a10 A and less 18a
2 D0 }- q! g0 c& l12 17) n7 B% }5 l9 h" X
13 16
# o1 R9 S3 a% ~0 s18 14
+ m( g4 h) O% Q: D7 s- v, d20 12) S: b, p9 O+ f8 J& H
Remark a: Size not specified for conductors in Class 2 or Low Voltage Limited Energy Circuits.3 L4 ~& r/ ^1 ?8 _# h. A
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這個標準我以前沒有做過,對於UL2089的要求不熟悉,同時我也有咨詢過幾位同行,對此看法不一;
( c W! f1 j- q# e- ~, M. G1). 有的認為既然標準沒有明確寫明是針對輸入還是輸出線的,那麼輸出線也參考這個標準;這樣非常痛苦,想象一下一個才5W約150g的產品拖一條18AWG SPT-2的線,不論是成本或形狀都讓有鬱悶;
& r2 M7 w$ p @. W2). 有人認為從條文來看主要是偏向於輸入線而不是輸出線,況且此類產品本身從輸入到輸出全是安全低電壓,輸入線考慮濫用會嚴格要求,但輸出線既然沒有規定可視為不做任何要求?
, F' f1 s- s4 W# n9 R, s3 h請教這方面的高手,假如我的產品輸入24V,輸出10V0.5A且滿足LVLE要求,在UL認證時會對輸出線怎樣評估才是合格?另外是否不論條文上有沒有注明,例如exception 1,所有UL認證設備中的線材必須是UL認證線才行?(如可行的話我打算用PU彈弓線,這种材質的線一般都是沒有UL認證的,最好用24AWG看是否有可行性) |
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