|
|
|  DSH 155- j: Z; o+ ^+ l5 p9 f2 c% g
3 j9 s# m; e1 w& `: I5 U | Concrete Vibrators
1 t" j3 [- U6 @: @% N | 8.67 a+ c) j, G; W9 h' ~* `3 e* e
| 60745-1(ed.1) & 60745-2-12(ed.1);am1
$ u6 j$ D R' i3 e/ k4 t |
3 F u4 V9 z+ J" Z7 o* a8 u4 N& sStandard:
& p. @# L9 I9 o3 GIEC60745-1: 1st, 1982% o' r0 `* E: Y5 ^2 W
IEC60745-2-12: 1st, 1982
7 R; A4 w v i" A% R* i) xSub-clause: 8.6 Sheet n. 155
/ K2 V/ w* [. g' H1 C+ ^0 ]2 {5 aPage 1(1)
2 ?& b$ Z3 R5 ]( dSubject: Concrete Vibrators Key words: Decision n. taken at 23rd0 C4 p, ]5 w0 }: _1 j
meeting/1986, {0 E5 ?2 P. {4 O% Z
Question: The circuits supplying motors and other components inside parts which, in normal use, are
- \6 g$ _% ~# b3 ]; X/ Z% Beither immersed in the mixture to be vibrated or held in the hand or operated by hand, shall be: O+ Q: G/ W$ F: Z: N) h# f
adequately isolated from the supply mains.
6 R; U$ [: N- c! Y& [' PCompliance is checked by inspection.6 s* j* I- U' u5 Y
This requirement may be met by supplying the relevant components either from a safety3 Z/ X4 E( Y- i! x' S- Q
isolating transformer or from an isolating transformer or motor-generator providing the same
+ w% v# \5 D+ g# Z! l3 O8 ddegree of isolation from the supply mains as a safety isolating transformer and having an rated
' b5 x( l% n/ _0 o2 ^, Q8 @& ]0 Coutput voltage not exceeding
2 v' ?5 _4 q; s b& c& Y115 V at frequencies not exceeding 60 Hz5 m% m) ]& S& J
250 V at frequencies exceeding 60 Hz.6 Q9 m4 \. c1 _/ E; r$ e: w: Q( `
-.-.-.-.-.-.-.-.-3 C& C! S4 u9 y
We would like to hear the opinion of the committee if a concrete vibrator class II, 250 V, 50' U) F. B4 W* n' z0 X8 h
Hz without being supplied from an isolating transformer or motor-generator fulfills the7 \5 c. s" W: \& S: g2 C
requirements stated in clause 8.6.8 A. Y) h4 u- V8 ~; ^" }# }2 u
Decision: Mr. kraaij then introduces document IECEE/CTL (CH) 004/1986 concerning IEC Publication: V6 r9 |8 P3 v) B* ^% D) [+ E: h
745-1 and 745-2-12, Concrete vibrators. The Austrian document IECEE/CTL (A-EXP) 02/89 is
. O! G, W" G) _4 i3 f9 K; V3 ?treated at the same time.
I. `) a. ~/ q" S$ gAfter discussion the Committee expressed as its opinion that there are three possibilities for. y' X! `9 @: y+ m x3 g
this type of equipment with regard to supply connection, namely:5 P( U5 | ?& W c% X
1. safety isolating transformer
4 n$ _+ A) h- ?& \; A/ S2. isolating transformer
7 T# D1 N" [2 `# j3 ~. P* v5 D3. motor generator
+ z4 @, j2 E% E5 Q# Y8 `+ G' l% o V( ?( J# a B& D" {
, x( `* \- r$ Q |
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有账号？注册安规
x
|
/1 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2012-11-8 15:34
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡