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条款：+ {, O% K& \' L2 o" q; L! N8 }$ P
5.4.2 A device that is constructed so that the alignment with the existing incandescent luminaire or
/ P5 h, d( @; h1 B! r2 mportable luminaire requires an adjustment greater than ±20 degrees shall be provided with adjustment of7 N0 n+ `# e: P& N/ V& C) A
the device base with relation to the remainder of the device. Examples include:
4 ~% ?% [# S1 N% A( Z: D% c' ia) A rectangular-shaped device in which the device is to be parallel with existing walls when
. J0 t. y, G, j3 d( [installed in a ceiling surface luminaire, and( A+ d l! y8 ~7 {
b) A device incorporating a ballast compartment or lamp support arms that will in some cases
* E$ ?: E1 x2 Q+ J/ n- Ohave to be rotated more than 20 degrees to properly clear harps in portable luminaires.
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9 ?; A; C3 w+ r) \6 V7 {该怎么理解？？ |
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发表于 2011-11-20 15:12
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没人给解释下？