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Compliance is checked by inspection and measurement. Except for that portion of the side of/ }) k% N" t- E. c
a FIRE ENCLOSURE that is subject to the requirements of 4.6.2 (see above paragraph), any one8 a% s+ _- ]8 M' g- s
of the following is considered to satisfy the requirements (other constructions are not
@2 e4 N" u: M) S; Aexcluded):5 N$ k+ s J3 x0 i# b c
− openings that do not exceed 5 mm in any dimension;. ~9 y5 t4 Z, o1 [1 Q. o6 T
− openings that do not exceed 1 mm in width regardless of length;
! V- K6 X. o- r" ` ^− top openings in which vertical entry is prevented (see Figure 4B for examples);0 H$ c( k% m3 i+ i# I: g2 v3 V
− side openings provided with louvres that are shaped to deflect outwards an external
/ r1 h1 p9 b0 O' B! lvertically falling object (see Figure 4C for examples);
1 B& l1 c2 I( b− top or side openings, as shown in Figure 4D, that are not located vertically, or within a# i& ]4 [. T8 ?) ^& \& b T
volume V bounded by a 5° vertical projection up to the size of opening L, above bare
9 V1 R; o) ^) D# ~9 T; x2 i, ^conductive parts:4 C- ?: ?5 M2 q- I
• at HAZARDOUS VOLTAGE, or
8 Q9 D; f+ D1 y3 d8 f6 U* U3 B- c• that present an energy hazard within the meaning of 2.1.1.5., |: X8 U0 T( [* ]% m, Z) P0 ^
4 x1 B: o- B+ [0 E% ?画重点：# Q1 u9 ?/ t# _! Y
any one
6 {$ V$ l- R) [) M o# i$ B# qof the following is considered to satisfy the requirements (other constructions are not
2 {3 X' ]( [. Q( |. d) |3 xexcluded) |
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