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 # I* A; D- \4 ]$ ?class II luminaire7 |: g* m+ U7 O; c3 i5 R# P
luminaire in which protection against electric shock does not rely on basic insulation only, but in* f9 f: S) H8 W/ R4 N1 H( A' t
which additional safety precautions such as double insulation or reinforced insulation are) j4 K& ?. j- E
provided, there being no provision for protective earthing or reliance upon installation5 Y$ R: X# J6 G4 Z
conditions.& I9 x+ ]4 d. Y4 s4 z3 R% B
NOTE 1 Such a luminaire may be of one of the following types: $ H# _' p0 l4 G) U7 qa) A luminaire having a durable and substantially continuous enclosure of insulating material which envelopes all4 B' B# m% \1 g# R, E2 ~9 g5 X
metal parts with the exception of small parts such as nameplates, screws and rivets which are isolated from live' _, Z% F' Y& h8 a$ D
parts by insulation at least equivalent to reinforced insulation. Such a luminaire is called an insulation encased/ b# g- W% G2 ^
class II luminaire. ) z# b% v8 ~/ q# [+ Jb) A luminaire having a substantially continuous enclosure of metal, in which double insulation is used throughout,* ]2 V, w+ O7 I9 s
except for those parts where reinforced insulation is used because the application of double insulation is 8 D# M3 l4 Q% R/ omanifestly impracticable. Such a luminaire is called a metal-encased class II luminaire.3 N% d: n! a2 m; N8 N. \+ |
c) A luminaire which is a combination of types a) and b) above., h8 `" ^. l8 H5 K- {
NOTE 2 The enclosure of an insulation-encased class II luminaire may form a part or the whole of the; y% O0 s% w; I! Y' q
supplementary insulation or the reinforced insulation. - a3 e. u" v7 ^+ i+ MNOTE 3 If earthing is provided to assist starting, but is not connected to an accessible metal part, the luminaire+ A% E& W2 q2 [& w7 q
may still be deemed to be of class II. Accessible metal parts in compliance with the appropriate IEC lamp- R' S/ w0 j5 V. |
specification and other metal parts not normally earthed and not normally accessible during normal use are not& d$ Y: O7 b" x8 d$ L- x3 G
regarded to be conductive parts which may cause an electric shock unless the tests of Annex A show them to be 3 ]* p- g" v+ q8 ^! l( c: p; E# Glive parts." G* s4 f2 [5 d t9 r6 H% ]) ^
NOTE 4 If a luminaire with double insulation and/or reinforced insulation throughout has an earthing terminal or an ( ^ O, q2 a* A( N$ d" `/ cearthing contact, it is class I construction. However, a fixed class II luminaire intended for looping-in may have an& Q) n, f1 d! k
internal terminal for maintaining the electrical continuity of an earthing conductor not terminating in the luminaire, ( N' c& z8 e) p1 Q! Jprovided that the terminal is insulated from accessible metal parts by class II insulation.# d1 Z9 E* S6 y8 z7 h) Y
NOTE 5 Class II luminaires may have parts in which protection against electric shock relies on operation at safety' w% c& M. `6 f. ~! B. Z7 N
extra-low voltage (SELV). ) H: ~1 N5 b' {- M1.2.243 \$ u5 \& [3 J! N
class III luminaire 0 v7 F' O4 |+ mluminaire in which protection against electric shock relies on supply at safety extra-low voltage m' k% h# D6 \(SELV) and in which voltages higher than those of SELV are not generated.0 \& a( c, E8 i! r7 J1 O
NOTE 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。