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两个孔之间的距离是取决于灯具适用的oulet box尺寸以及cross bar 上开孔位置的。
+ A" T+ v8 c' w5 K6 ]* u不过你这个图上，有很多不应该开的孔。你要看下这几个条款：
& y7 i( T' B. G5 ~* i8 X% U10.4.1 Open holes located 13 mm (0.5 in) or less from the surface on which the enclosure of a
1 S) n( F, U* `surface-mounted, outlet-box connected luminaire is intended to be mounted shall be considered to be one0 y$ i& t% f$ i* @. M$ _
or more of the following:& }2 J4 b7 g0 s. g+ b; L: F0 \6 P
(a) luminaire mounting holes;
% H) c# L5 s% Y, K x! j(b) component mounting holes;% X1 \$ Y' T( `% g7 f; F
(c) pendant device mounting holes; or
- x" H. V, x4 W(d) access holes.0 }. t1 u/ ^- _) L7 ?; o( j5 @6 s) l
10.4.3 General purpose open holes, such as ventilating open holes, shall be located more than 13 mm
" m3 m8 ?( ^* c(0.5 in) from the mounting surface of a luminaire and shall comply with the following:5 t2 I3 {- j6 w0 B% \/ J
(a) the area of each open hole shall not exceed 10 cm2 (1.5 in2).
8 z8 y% T* S- ~2 ]% ]* ?0 b# i: g. Z(b) the total area of holes shall be not more than 15 percent of the total area of the surface in
3 `: Q! ]$ c2 R# o8 I( u9 c/ N/ ewhich the hole or holes are located.
6 m4 C7 y2 Y1 |0 G$ L. |# _9 S(c) The open holes shall not be located in the mounting surface, in a canopy, or directly below
2 O) g3 O) y' c8 [. N8 ]electrical parts, as shown in Figure 10.4.1, that are required to be enclosed, unless the parts:
4 e! G4 C8 V1 C( u: o( z(1) are protected by a baffle in accordance with Clause 5.8;4 H n; ]5 l1 {7 E+ k4 @. [4 a
(2) have demonstrated compliance with the applicable normal and abnormal test
# m4 f, @- h0 E. |+ h4 drequirements; or
9 i9 c' Z, V0 h+ L$ a5 A(3) are constructed so as not to present a risk of fire under any foreseeable conditions. |
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