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5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or8 E* [3 C4 f2 N% K# T
portable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of
6 `) w# o4 p: I! gthe device base with relation to the remainder of the device. Examples include:
; w' Y: U% p! t2 g9 _/ x& D) C' [a) A rectangular-shaped device in which the device is to be parallel with existing walls when( e, ?+ d4 q( @# Q8 g
installed in a ceiling surface luminaire, and
0 R2 v2 A" z* c9 a- F, n6 }b) A device incorporating a ballast compartment or lamp support arms that will in some cases
& G- q8 i; c8 z, J; d: c2 Whave to be rotated more than 20 degrees to properly clear harps in portable luminaires.\
) u$ y( f' }9 ^9 D2 u0 a. g! w" [ 同志们 请帮忙解释下上面这段话!3 `' h. e1 g+ S4 K
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