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5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or9 T) y! I" j& w
portable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of
4 d7 a4 \* v! T2 } lthe device base with relation to the remainder of the device. Examples include:% U2 V! A/ i% x6 I
a) A rectangular-shaped device in which the device is to be parallel with existing walls when
8 i6 x# W$ q9 C! ^) qinstalled in a ceiling surface luminaire, and" G% S( s. J3 s8 D7 L% v& L
b) A device incorporating a ballast compartment or lamp support arms that will in some cases, F1 N6 S3 K4 P
have to be rotated more than 20 degrees to properly clear harps in portable luminaires.\
) O2 C& Q1 [8 j4 o! s; h 同志们 请帮忙解释下上面这段话!" m- O' b6 u& o4 g" v7 U0 c
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