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Compliance is checked by inspection and measurement. Except for that portion of the side of
! p Q% M0 @9 m1 c6 Ga FIRE ENCLOSURE that is subject to the requirements of 4.6.2 (see above paragraph), any one; g* G* }& |+ K4 [: V5 H3 H
of the following is considered to satisfy the requirements (other constructions are not
$ Z, W( Q3 H! Q \$ B4 v$ iexcluded):5 L3 r7 W, r: G8 G2 G/ W/ G
− openings that do not exceed 5 mm in any dimension;# e+ F4 s0 V3 c$ l* W
− openings that do not exceed 1 mm in width regardless of length;3 W A" N; ?) V- `+ ]" {+ ?$ ~
− top openings in which vertical entry is prevented (see Figure 4B for examples);6 w6 B( M1 u* y! S; t
− side openings provided with louvres that are shaped to deflect outwards an external+ u6 G+ L. w. J6 e5 u( O
vertically falling object (see Figure 4C for examples);
' @' L# D7 F8 j− top or side openings, as shown in Figure 4D, that are not located vertically, or within a" i; p8 i4 a" L9 @: ^) P4 \
volume V bounded by a 5° vertical projection up to the size of opening L, above bare0 y) [4 ^% J4 |! u6 i$ f
conductive parts:- X) }# w2 v7 D
• at HAZARDOUS VOLTAGE, or6 ` Y" X. B9 a
• that present an energy hazard within the meaning of 2.1.1.5.
$ \* u: h# z+ z/ n
4 Q* p# J% C, X6 |5 Q6 q画重点：
# A( n# b- L3 S1 {any one
) e4 P0 Z; k! Jof the following is considered to satisfy the requirements (other constructions are not
. w0 ?8 _/ [) @' ]; v$ Y1 Pexcluded) |
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