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5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or
6 E9 U* s+ z' g Gportable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of4 N: r' k! l9 G1 m
the device base with relation to the remainder of the device. Examples include:/ z6 H5 o6 X3 u$ ?* I% T$ s
a) A rectangular-shaped device in which the device is to be parallel with existing walls when
4 s0 t$ {/ x8 `+ Zinstalled in a ceiling surface luminaire, and9 j# l2 E6 x+ L7 O3 `
b) A device incorporating a ballast compartment or lamp support arms that will in some cases
8 L }! o. t5 Mhave to be rotated more than 20 degrees to properly clear harps in portable luminaires.\) t" q. r3 w' e$ M* X. n6 B
同志们 请帮忙解释下上面这段话!
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