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5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or7 ^6 ]: a2 S8 D0 {9 u% T
portable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of; R( Y& p/ l( \7 r% b) h
the device base with relation to the remainder of the device. Examples include:
) g/ h& [7 V& ]a) A rectangular-shaped device in which the device is to be parallel with existing walls when4 P. n+ k( f/ u( `
installed in a ceiling surface luminaire, and
* i) T; {5 k: n. Q, l) `' Q# wb) A device incorporating a ballast compartment or lamp support arms that will in some cases* H% W2 {+ q# W
have to be rotated more than 20 degrees to properly clear harps in portable luminaires.\9 h! [7 t* f! t$ I y8 c
同志们 请帮忙解释下上面这段话!
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