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Compliance is checked by inspection and measurement. Except for that portion of the side of
# y3 G( G% H4 {8 q& d5 ^' ra FIRE ENCLOSURE that is subject to the requirements of 4.6.2 (see above paragraph), any one
' L3 r2 d% Q! g8 Cof the following is considered to satisfy the requirements (other constructions are not
* ?( V! P+ N6 _7 ]- K/ j/ uexcluded):
' E. \3 K/ b. m# e/ r' ~− openings that do not exceed 5 mm in any dimension;) Z2 a' d* S& H6 S* Z
− openings that do not exceed 1 mm in width regardless of length;
- r4 [& K6 |6 p w) e' N− top openings in which vertical entry is prevented (see Figure 4B for examples);* O9 a# r9 e4 @+ K. M; m% u
− side openings provided with louvres that are shaped to deflect outwards an external
. G, M0 d0 e* `$ Fvertically falling object (see Figure 4C for examples); e9 _5 L- ] v, E9 t' p5 t4 `
− top or side openings, as shown in Figure 4D, that are not located vertically, or within a
( R: ]; e/ I$ s# S1 ^, ^3 w/ pvolume V bounded by a 5° vertical projection up to the size of opening L, above bare
& I, j( o+ ~+ W- {conductive parts:5 D. K" c, U9 d( z1 z; ]5 I
• at HAZARDOUS VOLTAGE, or
4 d) G2 E k u5 L3 w5 ~• that present an energy hazard within the meaning of 2.1.1.5.
8 c7 T1 {- ]6 ^; n0 H }( y$ j' C6 T9 W$ P* a7 U( k" Z
画重点:* R: [, k6 u+ q) }; F
any one
7 X+ V3 L2 M+ I6 M d% Rof the following is considered to satisfy the requirements (other constructions are not
6 J; F7 A+ j; l0 B+ P8 ]8 Bexcluded) |
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