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Compliance is checked by inspection and measurement. Except for that portion of the side of" n# a! p' C* v& Z" D; \
a FIRE ENCLOSURE that is subject to the requirements of 4.6.2 (see above paragraph), any one: ^+ j( S1 c a' q, P( ?' H
of the following is considered to satisfy the requirements (other constructions are not
( B# ?% Q& f y+ W. {& R$ Oexcluded):6 T' T/ d1 c2 o' z5 O
− openings that do not exceed 5 mm in any dimension;; [- R% I4 I! J
− openings that do not exceed 1 mm in width regardless of length;& _& h4 K4 K: W7 `# j+ z0 H) J
− top openings in which vertical entry is prevented (see Figure 4B for examples);) \' B* y6 q d; Q" Z0 J. y3 ^
− side openings provided with louvres that are shaped to deflect outwards an external
S& s$ {9 o& W% dvertically falling object (see Figure 4C for examples);
( n7 u' f# T8 H8 i, d6 p− top or side openings, as shown in Figure 4D, that are not located vertically, or within a8 n6 o1 E( {% B2 t7 ~: [
volume V bounded by a 5° vertical projection up to the size of opening L, above bare; g% u7 b4 y* }" u D, B
conductive parts:6 [2 I5 W) t+ ], A
• at HAZARDOUS VOLTAGE, or0 O0 E6 F( p) M# s9 T
• that present an energy hazard within the meaning of 2.1.1.5.
0 v+ n9 D5 S+ n, z4 R1 a* l; j: A
/ f8 v2 n& \; q3 P: V1 U: r画重点:) z/ Y2 Y: j( o$ X9 g' f3 Y& h
any one
- }" i6 H# \" Z& t- z- q, I& }3 Vof the following is considered to satisfy the requirements (other constructions are not
1 D9 Z0 P {& k, |! N) P. {: {! Jexcluded) |
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