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|  DSH 306
+ n; V N; P6 M6 x( v5 L$ Q( G7 T | Protection against Mechanical Hazards% e+ R# T& Y; k& z
| 7.1* E0 }" v# n) s* ?
| 61010-1(ed.1);am1;am24 J. Y6 @3 e, r' l& f
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Standard:
: w8 A' d9 ~5 F& c6 E$ ^" _IEC 61010-8 e( {! x6 R8 Q6 ?' Z( I2 I( n
1:1990+A1:1992+A2:1995+ A2 l- J+ `% H8 O
Sub clause:+ C3 [( Z- X* T) G& [+ y
7.1
8 @. Y! ` v7 gSheet n. 306$ V/ Q7 v) N% B ]7 B
Page 1(1)
, U, N* P) C' q/ N/ s7 d9 rSubject:# s ~0 B! U# Q- M3 i* m( o
Protection against mechanical
( O+ ?( e# E+ D# k$ S- i9 whazards
2 n. x& a$ C$ b- gKey words:
) C; e& j" ]* X* Q, W( Y5 G9 J: u- Guards: s% A6 ~ E/ }- t% @5 _2 O
- Access" m. u4 H0 w! I N5 L! j6 o0 u- S3 s8 T$ I
Decision taken by
& c6 a8 m+ v5 AETF3 and confirmed. n0 O2 B: r) T1 f, M* [
by CTL at its 38th* T; R$ Z/ Y0 A8 m: C7 C7 |( s
meeting, in Toronto
, L+ G' T* \: RQuestion:( D( E& @2 w; l' E! W
The requirement states that there must be no access to hazardous moving parts in Normal9 M$ z9 V5 f- a
Condition and no parts must be expelled in Single Fault Condition. Does this mean it is
: s5 {8 F6 Y" I: k& W& S1 oacceptable to have access to hazardous parts in Single Fault Condition?: y) L3 Y+ m, c, [$ q* a8 b5 v' m3 K
Decision:
/ Z9 J1 B" Z# I1 d5 I/ fMechanical parts are not subject to Single Fault Condition examination.) K3 d& H0 S0 B( R* I5 B. R9 x1 x E
Explanation: V, c' g3 o; Q
Specific tests are included in the standard for strength, e.g. impact hammer test, which
' P, N% }2 Z2 C5 s ?. q1 f$ h$ Y/ Hdetermine the acceptable strength of parts. It is not permissible to remove or presume/ G8 m7 ?: g4 e, m
destruction of mechanical components in simulated Single Fault Conditions in addition to" ^. C! O( q8 J! X
these pre-determined requirements.* D4 d# v' a: p) G0 v
Where safety of a moving part is determined by an electronic control, for example a speed1 v; K: }% ^' R W; i1 F: i
control circuit, then single fault analysis of this circuit must be performed if a hazard could
9 z9 i3 v! f5 s! x# Z& Parise.
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