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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。' \! D! S6 c) Z5 h
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:
' C& l- r9 Y' Q* a1 f* w4 {10.4.1 Open holes located 13 mm (0.5 in) or less from the surface on which the enclosure of a
_) q; F b: Esurface-mounted, outlet-box connected luminaire is intended to be mounted shall be considered to be one
8 f# k" t1 T# _' T9 O4 K/ j. w3 B0 Cor more of the following:
4 F3 [" n- D; W; I7 _; N8 n(a) luminaire mounting holes;4 M1 b2 ~8 C d+ e6 }7 e# h5 P
(b) component mounting holes;
: O1 t) {# b( G+ U; P4 K9 A* a(c) pendant device mounting holes; or0 M2 G+ f4 y9 x
(d) access holes.( K6 J/ `% d% w p: m
10.4.3 General purpose open holes, such as ventilating open holes, shall be located more than 13 mm
$ x/ _) d% B1 l |( m( v o(0.5 in) from the mounting surface of a luminaire and shall comply with the following:1 A1 h4 ~. D( {2 L' o5 k7 p, r
(a) the area of each open hole shall not exceed 10 cm2 (1.5 in2).
6 x& _+ q [5 }/ {5 `(b) the total area of holes shall be not more than 15 percent of the total area of the surface in, y/ w4 C; G3 i0 h2 h/ Y
which the hole or holes are located.
7 P. i" u7 V6 R(c) The open holes shall not be located in the mounting surface, in a canopy, or directly below" y. y& U! t% |8 m- v* _* R
electrical parts, as shown in Figure 10.4.1, that are required to be enclosed, unless the parts:1 g3 h0 t; D8 r0 e$ M
(1) are protected by a baffle in accordance with Clause 5.8;
K& H0 }% {* h4 N2 D8 J& C8 r0 h(2) have demonstrated compliance with the applicable normal and abnormal test
& ~0 V5 u( R+ q5 y. }2 W( q7 h8 x) ~! grequirements; or; u- G& ?2 u" t- m9 v3 I
(3) are constructed so as not to present a risk of fire under any foreseeable conditions. |
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