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参考(IEC60598-1 4.21): c, c$ B) ]# _. p
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4.21 Protective shield# b3 {! Z: j+ y* _8 _
5 R7 X$ K" r4 m3 s: k
4.21.1 Because of the possible risk of lamp shattering, luminaires designed for tungsten halogen lamps and luminaires designed for metal halide lamps shall be fitted with a protective shield. For tungsten halogen lamps, the shield shall be of glass. Luminaires designed to be used with self-shielded lamps only are exempt from this requirement, but shall be marked with the appropriate symbol (see Figure 1).: L9 D! [; F p0 X8 t& G& Y
NOTE 1 Lamps needing a protective shield as part of the luminaire construction are supplied with an appropriate. u0 s- F* c2 F, _" ]* N% W
cautionary notice or their packaging is marked with the symbol shown hereafter:$ \5 \2 W0 z& s; @/ q
NOTE 2 For lamps not needing a protective shield as part of the luminaire construction (self-shielded lamps) their
' R+ M* S# H0 K& K/ {7 F/ X' qpackaging is marked with the symbol shown hereafter:0 v9 f$ E. X9 W! ?3 d) P1 |
; J+ m9 s' ]# F- h4.21.2 Parts of the lamp compartment shall so be designed that particles from a shattering, h9 Y: ^. Y) w, B2 C$ f
lamp cannot impair safety.
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4.21.3 All openings in the luminaire shall be such that no parts of a shattered lamp can leave. D- n o2 C4 _% a4 O6 Y
the luminaire by a direct path (direct line of sight), including the rear of recessed luminaires.
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4.21.4 Compliance with 4.21.1 to 4.21.3 is checked by inspection and by the following tests:
4 ~$ d2 B, k# P! W$ \) N/ ~5 m9 f' h– the protective shield shall comply with the impact test of 4.13.1 with the impact energy of* Q- t$ D' W% \: X. i D# C
Table 4.3 for fragile parts;; k7 C: p4 @0 z/ X$ i
– parts of the lamp compartment, if of insulating material, shall comply with the resistance to
0 }) E1 M V/ A! jflame and ignition test of 13.3.2.
: s6 k% Z3 q% `1 }6 k% PNOTE 1 This requirement is intended to improve safety by eliminating the hazards due to chance failure of a lamp
2 N" C n5 w6 R1 ^. c, m2 Bor incorrect application. Existing open luminaires not fitted with a protective shield do not necessarily present a0 v9 j0 e% { p" K
hazard.
# r9 M: Z/ }7 J' U6 [6 uNOTE 2 The impact test of 4.13.1, which is performed from the outside, is regarded to be more severe than the" J! j& E, A- ?+ _
impacts of glass particles. A specific test simulating the latter is therefore not necessary. In case the mounting" g& s& h0 R1 E% ]& ~( f2 {
means of the glass shield is solely designed to withstand impacts from the inside, the test of 4.13.1 should be4 _+ b& u5 r4 M8 J
performed in that direction. |
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