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% x) c) {9 }5 r. q! L% I( Zclass II luminaire3 `' G. t. J+ h2 x) z
, z0 [6 \" a' ^( Rluminaire in which protection against electric shock does not rely on basic insulation only, but in" A: {0 U% M- n) C3 i2 h
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which additional safety precautions such as double insulation or reinforced insulation are4 `8 t3 X2 _2 u9 o/ }
: }) a* |# j0 t1 \- I" U! }provided, there being no provision for protective earthing or reliance upon installation+ g/ ]* r3 G2 S/ T& @
5 c* N! x: n% }2 N1 i. [8 Oconditions
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NOTE 1 Such a luminaire may be of one of the following types:
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a) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all/ q7 Z9 k4 J7 q$ {$ c% m5 ]' P
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metal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live$ A' k( U1 p+ K& w. a& l4 l5 |! G
$ `( q- F, ?) z7 G2 |0 K: ~parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased d* i% T/ m/ x+ L. Z8 P
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class II luminaire.
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b) A luminaire having a substantially continuous enclosure of metal, insulated from live parts by insulation at least3 w( r0 x! `, G' n
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equivalent to double or reinforced insulation. Such a luminaire is called a metal-encased class II luminaire.7 j) e8 K' g# D& i) C- u
7 x6 W' E( d0 B. y5 I( P9 M/ Nc) A luminaire which is a combination of types a) and b) above.
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: E0 V* n: F0 PNOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the
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supplementary insulation or the reinforced insulation.
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NOTE 3 If earthing is provided to assist starting, or for EMC reasons, but is not connected to an accessible metal
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; E9 J4 d0 I0 v& Y, A( Q' Kpart, the luminaire may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate7 `1 A1 I3 }' p- R" [% R% F
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IEC lamp specification and other metal parts not normally earthed and not normally accessible during normal use
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$ M1 }0 E8 F( N' G+ J9 I6 }- E- }are not regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them- ~# [) Z5 T* [! G% J' R
' n# i* o* |- p8 l# P! jto be live parts.
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NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has a safety earthing terminal- h' _; h% e8 W
' p6 W: q7 c; X$ v! i6 e/ n( Ior a safety earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in or# o/ k! K& T; \ J) |
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provided with through wiring may have an internal terminal or contact for maintaining the electrical continuity of an- l4 V: `3 m. ^2 ]/ H
$ n. Q: l: F. uearthing conductor not terminating in the luminaire, provided that the terminal is insulated from accessible metal
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parts by class II insulation.0 P( S+ {- ~# O6 a$ q
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以上摘录自IEC60598-1:2008，Page 21。" @( v2 ]4 B E3 k3 d. s- H3 n8 a
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但是，不管是 class I construction还是是Class II construction，都没有标准定义，请更多地参考其他标准。 |
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