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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( ~- F9 F2 y% F+ I6 \9 v7 j1. 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;
6 \( X$ Z% |+ i) U) a; _! m 另外在Clause 12.1下的兩項Exception No.1 and No. 2; * @: i1 J0 |" p/ c8 w; q% u/ f
12.1 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.! `% d- r% o Z/ c; v2 f% M
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).1 }# A% `+ n0 s+ O. C$ G1 {1 ]
Exception No. 2: For units rated 10 A or less, an equivalent style appliance wiring material (AWM) may be employed.
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Table 12.1 Cord sizes4 @: x+ L7 `$ \4 s0 @0 M2 |0 b* [2 o
Adapter input fuse rating, Amps Minimum cord conductor size, AWG1 ~7 n& k* c9 Z% i, e
10 A and less 18a/ M2 B) U3 D- s$ P
12 17
9 f, o' g" G+ V$ p8 o: t h13 16) z" O& l* |# ?, U; G% w2 Z
18 14* D, g K1 ` J- _
20 12- L. u+ L: I2 Y5 b6 c3 P1 W# A: w
Remark a: Size not specified for conductors in Class 2 or Low Voltage Limited Energy Circuits.
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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;
* N7 l* N. ]2 t. I6 ?6 r3 n1). 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;, J0 N0 e3 P4 Z( S$ C
2). 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?5 {0 Y5 M! Z. }; e$ Q" Y/ ?
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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