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|  DSH 155
, i- p& T/ O) J# e* k7 p* O! N: |% H" T5 \3 j- s& `
| Concrete Vibrators
( K8 W. @5 ^0 r$ W! j | 8.6
0 o4 k2 e$ Z" s# I | 60745-1(ed.1) & 60745-2-12(ed.1);am1* ~7 Y5 f4 O4 s: N0 `) A3 {
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' y2 d6 h1 R6 zStandard:
, X2 i* @* q# ?3 n6 `( W/ D! M# P9 K* GIEC60745-1: 1st, 19820 J. {% x. |$ J: r0 p p& k: u
IEC60745-2-12: 1st, 1982
1 Y4 d+ s( V' R! A( d( MSub-clause: 8.6 Sheet n. 155
$ e5 n6 [( F( o* V$ o1 XPage 1(1)# S( }5 ]; w8 v! T
Subject: Concrete Vibrators Key words: Decision n. taken at 23rd
% \; O7 K h% S$ p% v8 }meeting/1986
+ ?( ?- |6 p) UQuestion: The circuits supplying motors and other components inside parts which, in normal use, are
8 u3 V0 q( B7 S geither immersed in the mixture to be vibrated or held in the hand or operated by hand, shall be2 B+ m; ~+ [. m, R3 ~
adequately isolated from the supply mains.3 c9 o( ~. B; h& s$ J% T- B) [
Compliance is checked by inspection.2 h- W2 J" o& v- G
This requirement may be met by supplying the relevant components either from a safety) x+ X% R; f4 u
isolating transformer or from an isolating transformer or motor-generator providing the same
& H' w, ~9 T o& P( {, rdegree of isolation from the supply mains as a safety isolating transformer and having an rated
9 J j) c6 u, T. H2 s' N' c0 Joutput voltage not exceeding
8 L: u: N8 M# ?7 C# H115 V at frequencies not exceeding 60 Hz
2 ~6 z1 L+ A0 Y# Z" Q- a250 V at frequencies exceeding 60 Hz.
' N- P5 Y( s3 K, w, _. c: M. m-.-.-.-.-.-.-.-.-1 p% I3 }. j* O. O, n, D( P
We would like to hear the opinion of the committee if a concrete vibrator class II, 250 V, 50
- O/ z2 Q+ a( a$ v& i7 Q5 nHz without being supplied from an isolating transformer or motor-generator fulfills the
7 z- e" {& ?' ?& mrequirements stated in clause 8.6.
; z. S- F; Z5 ~# p$ D# ZDecision: Mr. kraaij then introduces document IECEE/CTL (CH) 004/1986 concerning IEC Publication- c8 _/ u5 R" h: s
745-1 and 745-2-12, Concrete vibrators. The Austrian document IECEE/CTL (A-EXP) 02/89 is- C! T, v# |- s/ V/ S0 o
treated at the same time.8 }$ Y8 H, k+ t$ E" g
After discussion the Committee expressed as its opinion that there are three possibilities for0 K( {: W- p+ B! N
this type of equipment with regard to supply connection, namely:/ t2 ?2 Q0 f, E1 M9 U( _
1. safety isolating transformer8 G8 e$ X& g. U$ J+ I
2. isolating transformer
7 i) R, Q& z5 |3. motor generator$ V+ j& g1 H: i+ \
7 u1 S3 L/ C: S( |# T0 I6 O+ e! ^- s1 J p* o( a# G
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