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Compliance is checked by inspection and measurement. Except for that portion of the side of
( g9 {6 N3 ]6 g8 q/ u( C; b7 Qa FIRE ENCLOSURE that is subject to the requirements of 4.6.2 (see above paragraph), any one& G9 A$ U H6 G0 B0 Q0 X) I
of the following is considered to satisfy the requirements (other constructions are not' N7 a1 L' {* A0 c
excluded):8 y6 ~) `# E5 z
− openings that do not exceed 5 mm in any dimension;2 R. d1 x4 H8 ~6 e3 e5 i$ u
− openings that do not exceed 1 mm in width regardless of length;, c, T1 b( v& r$ ^, i! U: S8 y
− top openings in which vertical entry is prevented (see Figure 4B for examples);/ C+ [) }! M9 e$ h* p/ ^& s& ]6 M
− side openings provided with louvres that are shaped to deflect outwards an external$ _$ E# {# t% b( }+ c
vertically falling object (see Figure 4C for examples);2 J% j6 u5 e+ X
− top or side openings, as shown in Figure 4D, that are not located vertically, or within a
w3 I$ d7 K* p4 ?* m ovolume V bounded by a 5° vertical projection up to the size of opening L, above bare, Q2 e$ D& T/ `
conductive parts:: r* l# b" B3 m2 A! a
• at HAZARDOUS VOLTAGE, or$ b" f8 [8 `9 T0 Y' X: \) a
• that present an energy hazard within the meaning of 2.1.1.5.
7 J; f8 a" v0 b
) E# v, o" q5 ^5 G7 K6 h画重点：
6 S+ R5 K( L v2 V) I8 @8 u3 r5 gany one) O4 | I1 ]( P* J2 h. [3 ?
of the following is considered to satisfy the requirements (other constructions are not7 A1 Z# x2 D! a& ]" t- f1 g( d
excluded) |
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