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5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or
: a6 P/ D" U' H7 }8 d8 |9 tportable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of- |: S+ L8 |, m# O
the device base with relation to the remainder of the device. Examples include:
8 q4 o3 U* B: P* T" e4 {a) A rectangular-shaped device in which the device is to be parallel with existing walls when+ @ q# y8 m3 [. M* k1 S4 B$ p0 T# j' ^
installed in a ceiling surface luminaire, and9 O+ {* F2 E# r( j/ H Z+ I
b) A device incorporating a ballast compartment or lamp support arms that will in some cases P+ Y& Z6 O3 n$ ~
have to be rotated more than 20 degrees to properly clear harps in portable luminaires.\
+ L5 J" ~; O# N$ V! C 同志们 请帮忙解释下上面这段话!2 r# l8 e6 Z( e% w. q! r, k
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