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10.4.4 Luminaire mounting holes may be any shape. A maximum of four open holes shall be permitted
6 R# X' N! u" ?5 O7 cwithin the area directly below the outlet box opening in accordance with Figure 10.4.1. The maximum area0 `4 q0 L$ o+ H8 a2 _1 X( A- M0 b
of each hole shall be 2.6 cm2 (0.41 in2). Two additional holes shall be permitted for each 610 mm (24 in)
) W5 K: @' Q5 |, x5 C# l; m8 m3 Eof luminaire length in excess of 1270 mm (50 in).
7 y/ H$ `7 C: p6 b
; N& M4 ]' e- F6 G. Y6 o; a& s我这里有两种理解,不知哪种是正确的:2 }) X# S# P7 V6 }/ ]0 Z
1. 在Canopy上只能有4个安装孔,且每个孔的面积要不大于2.6 cm2 ,除非灯的长度大于1270 mm 才能另外多加两个孔., I f2 @* S. r2 a0 v1 q
2. 出线盒在Canopy上5度角的投影面积上只能有4个安装孔,且每个孔的面积要不大于2.6 cm2 ,除非灯的长度大于1270 mm 才能另外多加两个孔. |
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