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5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or" x6 v1 `6 P; K
portable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of; q, I- Y# f$ b* g" ^ z$ z. ]
the device base with relation to the remainder of the device. Examples include:3 E+ K; v: e, S8 L
a) A rectangular-shaped device in which the device is to be parallel with existing walls when
- r" S) z( I- P) M! kinstalled in a ceiling surface luminaire, and
3 a2 t. k+ m4 B# L) h7 Fb) A device incorporating a ballast compartment or lamp support arms that will in some cases
I( z6 U' u. z hhave to be rotated more than 20 degrees to properly clear harps in portable luminaires.\) y" o) [7 W* b
同志们 请帮忙解释下上面这段话!
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