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关於车载充电器UL2089,阅读在条文中有提到对线材的规定:
1. 只查到Clause 12 Flexible Cords有一些对线材的明确要求,规定了线材型号/长度和AWG Size Table 12.1;
另外在Clause 12.1下的两项Exception No.1 and No. 2;
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.
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).
Exception No. 2: For units rated 10 A or less, an equivalent style appliance wiring material (AWM) may be employed.
Table 12.1 Cord sizes
Adapter input fuse rating, Amps Minimum cord conductor size, AWG
10 A and less 18a
12 17
13 16
18 14
20 12
Remark a: Size not specified for conductors in Class 2 or Low Voltage Limited Energy Circuits.
这个标准我以前没有做过,对於UL2089的要求不熟悉,同时我也有咨询过几位同行,对此看法不一;
1). 有的认为既然标准没有明确写明是针对输入还是输出线的,那麽输出线也参考这个标准;这样非常痛苦,想象一下一个才5W约150g的产品拖一条18AWG SPT-2的线,不论是成本或形状都让有郁闷;
2). 有人认为从条文来看主要是偏向於输入线而不是输出线,况且此类产品本身从输入到输出全是安全低电压,输入线考虑滥用会严格要求,但输出线既然没有规定可视为不做任何要求?
请教这方面的高手,假如我的产品输入24V,输出10V0.5A且满足LVLE要求,在UL认证时会对输出线怎样评估才是合格?另外是否不论条文上有没有注明,例如exception 1,所有UL认证设备中的线材必须是UL认证线才行?(如可行的话我打算用PU弹弓线,这种材质的线一般都是没有UL认证的,最好用24AWG看是否有可行性) |
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