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5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or) B, m6 r( M# {* P" |/ \
portable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of
3 ?& s& A) r1 {. o" Q+ o. bthe device base with relation to the remainder of the device. Examples include:
k( X8 w7 C, d$ w, T" Fa) A rectangular-shaped device in which the device is to be parallel with existing walls when8 }! M( @* c2 T- S; w- w
installed in a ceiling surface luminaire, and
0 D5 V/ m. c2 cb) A device incorporating a ballast compartment or lamp support arms that will in some cases/ \* |+ K, Z& L% U
have to be rotated more than 20 degrees to properly clear harps in portable luminaires.\- E; z2 N3 b; Q* ^
同志们 请帮忙解释下上面这段话!
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