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Compliance is checked by inspection and measurement. Except for that portion of the side of
9 _+ ^) ?& _& ]# \: L- h' Na FIRE ENCLOSURE that is subject to the requirements of 4.6.2 (see above paragraph), any one: u! S K0 E1 E- t
of the following is considered to satisfy the requirements (other constructions are not
* ~; s) w5 ~) }$ @" w5 C7 Jexcluded):2 Q8 v9 r2 x4 C5 E( Y
− openings that do not exceed 5 mm in any dimension;3 X1 n, g! S, `( B0 h
− openings that do not exceed 1 mm in width regardless of length;6 b. ]+ X- g5 B, \' m. {# @# q: e
− top openings in which vertical entry is prevented (see Figure 4B for examples);
' N& o7 `" F% N/ |1 s' g# L' T− side openings provided with louvres that are shaped to deflect outwards an external
9 R/ P+ u# W* ]; o/ H9 l5 cvertically falling object (see Figure 4C for examples);
" d8 l8 ^1 Q: X% Q$ W− top or side openings, as shown in Figure 4D, that are not located vertically, or within a5 R( r; g% ~8 w% ~7 A5 O \
volume V bounded by a 5° vertical projection up to the size of opening L, above bare8 H# l; h& U1 Z" H7 { D( `
conductive parts:* T, }$ W1 W: U3 X
• at HAZARDOUS VOLTAGE, or
6 h2 }6 `; h& i( H& F" \• that present an energy hazard within the meaning of 2.1.1.5.% Z, Y1 d m" C- t
3 G* M6 z( I9 L% m3 W, \; l7 t. m& f画重点：
3 _3 J. _9 x6 W& [( j# Kany one
/ k0 D8 F* Q. r- Q- Y! lof the following is considered to satisfy the requirements (other constructions are not
9 U0 e: a( Y$ _8 H! {9 q9 L' Texcluded) |
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