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Compliance is checked by inspection and measurement. Except for that portion of the side of
% {% ~7 l' E% _( }/ ] Ha FIRE ENCLOSURE that is subject to the requirements of 4.6.2 (see above paragraph), any one# ^! x# [6 |" e4 M+ o% c
of the following is considered to satisfy the requirements (other constructions are not
6 ~* V, x0 S, O, Jexcluded):& p' M2 s- j+ C' x
− openings that do not exceed 5 mm in any dimension;
: I0 w# W% s# ^( A" t+ r6 K! ~− openings that do not exceed 1 mm in width regardless of length;( o( E$ u* a! l! x, k1 H
− top openings in which vertical entry is prevented (see Figure 4B for examples);
# O& [! y) W, U; |− side openings provided with louvres that are shaped to deflect outwards an external
6 }9 X* @% y4 O- m; u1 y* Cvertically falling object (see Figure 4C for examples);+ l3 g. I3 d% |" v1 [3 K7 @
− top or side openings, as shown in Figure 4D, that are not located vertically, or within a
% u7 |$ D' T) w$ H% m! K ^volume V bounded by a 5° vertical projection up to the size of opening L, above bare9 }; h8 y) j4 C2 @) _) F) M
conductive parts:9 J% y" K# K5 J% F
• at HAZARDOUS VOLTAGE, or
4 i5 p7 c( P2 Z) j& y0 J3 t3 u• that present an energy hazard within the meaning of 2.1.1.5.
( Q0 ?! F: D: x, k) T6 F
* O4 u, ]" m( @+ F* g1 Q' k画重点:1 s5 P' G' y* A( X6 a
any one
% _' C P. U0 ^6 m' I gof the following is considered to satisfy the requirements (other constructions are not
5 G& s1 |+ o- ?- e# l$ b7 K) Zexcluded) |
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