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5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or
$ O! Q* Q9 I$ s$ g% ^0 rportable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of
* }. X$ N8 l' r9 v, s% f( ~the device base with relation to the remainder of the device. Examples include:
& P' M- Y5 A j5 P4 V+ ua) A rectangular-shaped device in which the device is to be parallel with existing walls when4 H1 U+ O( J1 R4 i/ b
installed in a ceiling surface luminaire, and% m' [- x, c; J+ [
b) A device incorporating a ballast compartment or lamp support arms that will in some cases
# f) v, u5 z2 a) o5 | |have to be rotated more than 20 degrees to properly clear harps in portable luminaires.\; ]' U# x7 x, B$ V* A) n6 z }* y! }
同志们 请帮忙解释下上面这段话!
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