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5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or
* L/ e, |6 o/ ~: yportable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of) H6 b9 K! z y/ r( Y9 Z$ Z* w: W! y
the device base with relation to the remainder of the device. Examples include:5 w1 a8 O- I \; ~
a) A rectangular-shaped device in which the device is to be parallel with existing walls when
( _1 U- _* \4 H d1 _installed in a ceiling surface luminaire, and: y) \, y* P4 H5 T" y& l, J
b) A device incorporating a ballast compartment or lamp support arms that will in some cases
1 ]2 c Q- O9 X# chave to be rotated more than 20 degrees to properly clear harps in portable luminaires.\$ M! Q0 Q6 z+ ^ @) l" `' [2 U
同志们 请帮忙解释下上面这段话!2 i2 X0 @; }( I8 ]" R- }7 Y1 L
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