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Compliance is checked by inspection and measurement. Except for that portion of the side of
. v+ j( B& W/ Ra FIRE ENCLOSURE that is subject to the requirements of 4.6.2 (see above paragraph), any one$ L R& N- N* K9 ]: \6 z! O
of the following is considered to satisfy the requirements (other constructions are not
3 j- o' q. M) ]) D. l2 oexcluded):
! r2 J; |& w8 J+ m− openings that do not exceed 5 mm in any dimension;6 y% Z6 I* u( h
− openings that do not exceed 1 mm in width regardless of length;
% k- C- W3 }; Z1 }% k/ ]4 ^; o− top openings in which vertical entry is prevented (see Figure 4B for examples);
( k: _$ f1 z9 w4 s* c( P− side openings provided with louvres that are shaped to deflect outwards an external
. c) N1 K: D: c- t; E# Q8 Xvertically falling object (see Figure 4C for examples);/ K( i" C2 D3 F6 j, N3 h
− top or side openings, as shown in Figure 4D, that are not located vertically, or within a
( \" r) ^2 p, r" @8 e" X! bvolume V bounded by a 5° vertical projection up to the size of opening L, above bare
/ o! x9 I) {0 bconductive parts:
1 \3 Y2 s! L% A5 ^$ b% H' k• at HAZARDOUS VOLTAGE, or
9 t ]5 \! V8 r9 W• that present an energy hazard within the meaning of 2.1.1.5.
2 Z& ^& ^# u1 X3 O
|1 F: K, [; y8 j0 b6 V画重点：
1 q6 |4 j0 _! M3 R2 Dany one# Y4 V) u9 @* k, i" i& u
of the following is considered to satisfy the requirements (other constructions are not
8 L( {( k4 w. J2 r n) Texcluded) |
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发表于 2017-5-6 15:41
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