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10.4.4 Luminaire mounting holes may be any shape. A maximum of four open holes shall be permitted8 _- I; Y4 u* F) a4 b/ c6 _& @
within the area directly below the outlet box opening in accordance with Figure 10.4.1. The maximum area0 B0 Y$ M3 p, t4 {8 \' w
of each hole shall be 2.6 cm2 (0.41 in2). Two additional holes shall be permitted for each 610 mm (24 in)% I$ ?0 E: k* x9 a+ D1 a! h
of luminaire length in excess of 1270 mm (50 in).. {' C7 B8 v0 c! o5 H) ~% o0 ^
& ~: I1 h0 M: D5 D/ H: f我这里有两种理解,不知哪种是正确的:3 q7 p7 m5 {# K, {7 D7 e! }. D
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.
* S9 N9 L' `7 R' m, Z' H0 z 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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