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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:
! b. q9 \- H5 w9 j* m) a- ]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;5 D4 Y+ q- m8 R
另外在Clause 12.1下的兩項Exception No.1 and No. 2;
, a' k' X4 R1 J9 L' |6 |0 H1 P12.1 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.* j9 X% O' i( d& \ @2 c
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).
! t5 _9 T2 R1 j D: g8 bException No. 2: For units rated 10 A or less, an equivalent style appliance wiring material (AWM) may be employed.
4 x. Q1 T: {8 S& c, s9 c8 d( D& ]% d- y$ x. h4 N8 P, Z9 L
Table 12.1 Cord sizes
$ U0 I6 q/ e$ {' A4 z. r& |- Y( v5 AAdapter input fuse rating, Amps Minimum cord conductor size, AWG
0 Z' K: F3 @; ~' V2 M8 x4 I10 A and less 18a
: K$ ] V' B- F) q12 17
Q7 ?+ r4 a0 N- e. v13 16$ @0 l8 M6 M4 o& i3 u
18 14
]7 C. x% Q @& ~20 12
( C" _/ b i1 m+ v8 f4 @Remark a: Size not specified for conductors in Class 2 or Low Voltage Limited Energy Circuits." {3 ?9 q% l* A6 r
* k' D$ g0 G7 k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;; a. U' s) a( A) l* ~' V
1). 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;
! }+ ~+ f, I) f1 [) f# M. `4 ]. [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?$ s) U/ L, f) i
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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