标题: UL1993 5.4.2怎么理解？ [打印本页] 作者: wmfgtv 时间: 2012-1-27 14:55 标题: UL1993 5.4.2怎么理解？ 条款：
5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or
portable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of
the device base with relation to the remainder of the device. Examples include:
a) A rectangular-shaped device in which the device is to be parallel with existing walls when
installed in a ceiling surface luminaire, and
b) A device incorporating a ballast compartment or lamp support arms that will in some cases
have to be rotated more than 20 degrees to properly clear harps in portable luminaires.