标题: 一类灯与二类灯的最大区别是在那里? [打印本页] 作者: 龙语 时间: 2007-9-5 09:46 标题: 一类灯与二类灯的最大区别是在那里? 一类灯与二类灯的最大区别是在那里?也就是比较明显,作者: 火神 时间: 2007-9-5 09:55
你可以看看一类灯与二类灯的定义就知道了。。。。作者: RodgerLan 时间: 2007-9-5 09:57
一类灯基本绝缘带地线, 二类灯双重绝缘不带地线作者: RodgerLan 时间: 2007-9-5 10:01
1.2.23 - H3 i7 ]7 [* R7 b6 M8 M, w& |class II luminaire $ j* {, u; \' X8 x% C4 w4 Jluminaire in which protection against electric shock does not rely on basic insulation only, but in 7 _5 N G! \2 _5 Z# J7 owhich additional safety precautions such as double insulation or reinforced insulation are3 G2 a* L( F* K& w
provided, there being no provision for protective earthing or reliance upon installation0 t! N* R: _7 `# T
conditions., q9 }$ I# c6 o4 R
NOTE 1 Such a luminaire may be of one of the following types: Z4 h9 r/ `. ?6 C( \! A( ra) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all # @7 U1 w1 d: w \& r, mmetal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live, h; j6 `0 o) U+ A/ Q
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased _ \4 K4 M' y x6 C8 v
class II luminaire.. _( O' W+ O- Q$ ?. W- S* {& u
b) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout, . \- \3 ^+ |, s* Zexcept for those parts where reinforced insulation is used because the application of double insulation is & j( ?4 \6 F/ e+ gmanifestly impracticable. Such a luminaire is called a metal-encased class II luminaire./ g4 x" j( w* A7 w9 E
c) A luminaire which is a combination of types a) and b) above.! _) T" a& u- g! y
NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the % V; s" ?0 u7 h& |& |9 _supplementary insulation or the reinforced insulation.+ T6 r$ h, c3 ^1 F4 j" t
NOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire$ n: S5 w' N! N5 q+ z
may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp7 i* w. J- S S0 [0 D
specification and other metal parts not normally earthed and not normally accessible during normal use are not , d$ u* B# X; G6 Q% v" rregarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be + N/ X1 p! L& `2 V9 K D2 W6 I2 glive parts. 3 K* {# k5 a# ANOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an& b0 u. d. Z9 x: r7 X/ B
earthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an% ~4 {& R) T% h7 h) [& g
internal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire,) N# {/ \: q; M* w' u. Y' l
provided that the terminal is insulated from accessible metal parts by class II insulation. ( ?( s/ u5 B- X( w6 eNOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety' G/ q9 B" A8 S
extra-low voltage (SELV). 7 a/ h' g4 ?- g) X0 z7 \, m1.2.24 3 w3 `" E) n+ R) d! }class III luminaire 0 l, H( x2 K8 Y) B$ v1 `7 `2 l( Eluminaire in which protection against electric shock relies on supply at safety extra-low voltage" {. f: X$ f2 p! G8 J% Q G
(SELV) and in which voltages higher than those of SELV are not generated. ; V6 I8 ^ C' L- N8 l- ONOTE A class III luminaire should not be provided with means for protective earthing.作者: yzyjy 时间: 2007-9-5 10:20
简单的看输入电源线三芯的是一类灯(即有接地线的).作者: RodgerLan 时间: 2007-9-5 10:25
没错, 它的电线标都不一样作者: caballo3157 时间: 2007-9-5 11:50
II类必须有“回”标志。