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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。
9 C) n$ f6 O. E- r6 K! g2 P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：1 r& E* H6 C8 g! }
10.4.1 Open holes located 13 mm (0.5 in) or less from the surface on which the enclosure of a6 g ~- }$ m( o' w( P' G, Z
surface-mounted, outlet-box connected luminaire is intended to be mounted shall be considered to be one
! J2 ^2 f* I2 `' ror more of the following:, X* |# g% {; y6 p) }
(a) luminaire mounting holes;
1 f9 @( V1 _6 r8 |6 R(b) component mounting holes;8 G4 x/ n/ {: z8 w+ ~' W
(c) pendant device mounting holes; or
( C& v) f" |& t' ](d) access holes.. x2 _8 z7 H# m/ [
10.4.3 General purpose open holes, such as ventilating open holes, shall be located more than 13 mm( Q. E# G1 y- J% s" C1 n" ~, I; n
(0.5 in) from the mounting surface of a luminaire and shall comply with the following:3 D" u' w5 b+ l; a- ?9 `; r
(a) the area of each open hole shall not exceed 10 cm2 (1.5 in2).
# e6 w9 }( x) \1 b, E" {) m(b) the total area of holes shall be not more than 15 percent of the total area of the surface in
! _# c; }. ^5 ?5 ]8 pwhich the hole or holes are located.5 ^6 W$ [7 M* [/ A% }2 Y! N2 L I
(c) The open holes shall not be located in the mounting surface, in a canopy, or directly below
% I5 F4 m4 S, A& k. `electrical parts, as shown in Figure 10.4.1, that are required to be enclosed, unless the parts:: O, q* t; K7 G! K2 w+ t4 {/ p$ r( l
(1) are protected by a baffle in accordance with Clause 5.8;0 ?- G/ w5 y% B" S& |7 P/ n- R
(2) have demonstrated compliance with the applicable normal and abnormal test
% I) f" ?- o, U$ C( l4 Drequirements; or/ ~- E& Z5 F. }& v6 l* k9 A9 |( X
(3) are constructed so as not to present a risk of fire under any foreseeable conditions. |
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