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5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or( K3 |7 e" n/ T& K! P
portable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of
8 V4 N1 V" \, E7 k9 i0 [/ Jthe device base with relation to the remainder of the device. Examples include:& b6 X5 a% }% O1 D- k( t
a) A rectangular-shaped device in which the device is to be parallel with existing walls when# P2 d. k+ R7 \- U* m2 e- r7 S4 R
installed in a ceiling surface luminaire, and
, ?( Q6 k7 N! f6 T) c: [6 G& eb) A device incorporating a ballast compartment or lamp support arms that will in some cases
8 i7 {. s) e1 z0 i( }; x, w+ ]have to be rotated more than 20 degrees to properly clear harps in portable luminaires.\
$ s9 }4 Q4 U ^! x: n/ o 同志们 请帮忙解释下上面这段话!6 W1 S M5 W5 D% a P0 x9 c/ A
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