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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。# }+ p8 q( c# C- O, S- m2 @# Y8 t
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：2 ]8 y6 `1 ?4 T+ w1 b$ c
10.4.1 Open holes located 13 mm (0.5 in) or less from the surface on which the enclosure of a
) [, D/ l; A3 w# Nsurface-mounted, outlet-box connected luminaire is intended to be mounted shall be considered to be one
% {2 @$ z' ^8 O: r Q) [3 Z8 r7 R. t' zor more of the following:2 f- a( ^" b8 r
(a) luminaire mounting holes;
( U9 `" M- `: N(b) component mounting holes;
8 k, N1 w& X# c(c) pendant device mounting holes; or
" d1 R3 a+ @8 N1 D# Z9 J(d) access holes.) N' H$ P& e# _" X8 Y Q
10.4.3 General purpose open holes, such as ventilating open holes, shall be located more than 13 mm4 u5 C3 v! }' E8 h
(0.5 in) from the mounting surface of a luminaire and shall comply with the following:( s/ k# ~4 V2 d# x0 p
(a) the area of each open hole shall not exceed 10 cm2 (1.5 in2).% T( [% }) ~7 V! \+ b
(b) the total area of holes shall be not more than 15 percent of the total area of the surface in
8 j: ~ T3 V- i' u/ b; swhich the hole or holes are located.
! H1 q% s8 r. C(c) The open holes shall not be located in the mounting surface, in a canopy, or directly below
( W# y% K' O4 x5 |# Selectrical parts, as shown in Figure 10.4.1, that are required to be enclosed, unless the parts:
% I, f* w5 H" }; ^- c% r# u; r(1) are protected by a baffle in accordance with Clause 5.8;; g) A0 s) n7 u& a9 ]% M
(2) have demonstrated compliance with the applicable normal and abnormal test
( M h2 e" A8 U( k7 Krequirements; or
! j8 g, \* {1 I. u" T9 s& q(3) are constructed so as not to present a risk of fire under any foreseeable conditions. |
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发表于 2012-5-12 14:18
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