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Compliance is checked by inspection and measurement. Except for that portion of the side of
. `- B, I8 i" `3 _/ z: b5 ^, L ba FIRE ENCLOSURE that is subject to the requirements of 4.6.2 (see above paragraph), any one! A+ X C$ ^( I+ B( R# l1 O
of the following is considered to satisfy the requirements (other constructions are not
/ K0 V, @3 L1 ]% Cexcluded):
6 K, T7 L" m" w− openings that do not exceed 5 mm in any dimension;
5 T$ K9 a* Q' t, z- d− openings that do not exceed 1 mm in width regardless of length;
. c5 S& I i, F! N− top openings in which vertical entry is prevented (see Figure 4B for examples);0 i2 {$ a! Z0 P5 \
− side openings provided with louvres that are shaped to deflect outwards an external
) ]6 J l! g. i7 z2 gvertically falling object (see Figure 4C for examples);
# U- x. U X2 A" e( }! @− top or side openings, as shown in Figure 4D, that are not located vertically, or within a
7 G k2 [4 {9 Q( y$ T! M( xvolume V bounded by a 5° vertical projection up to the size of opening L, above bare8 }# j7 o# F K3 Z) v! H. H
conductive parts:
e# Y& F' F& v• at HAZARDOUS VOLTAGE, or
) c) Z: K" S! M) s• that present an energy hazard within the meaning of 2.1.1.5.- }+ m5 l+ e3 \( O8 y z( V7 j
5 Z7 o" ?$ T. S) Y* R8 o画重点:
p: r8 d% A1 a/ U. {any one& c( b. g1 N3 m% A. S1 M
of the following is considered to satisfy the requirements (other constructions are not
: G0 o7 W. v9 R: ]1 ~& Xexcluded) |
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