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( k4 y V! m- r( c6 ^ V |  DSH 306
/ q1 ^7 n7 Z. L/ o9 I | Protection against Mechanical Hazards
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1 r4 W Y( a# n+ ^0 a | 61010-1(ed.1);am1;am2
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Standard:& x7 \4 ^7 _% Y4 R0 p# z
IEC 61010-
$ O. U* y1 ]% M) \8 ~$ l8 Z0 C0 a1:1990+A1:1992+A2:1995
5 i$ r# d% Z5 l4 x( Z; ^Sub clause:$ h1 R- z8 W7 x- }! @
7.1
0 ~6 V7 j- ?4 i" PSheet n. 3063 Y9 R! X8 t* n& e7 z
Page 1(1)
S: l# o7 Z/ K, i" y* N/ BSubject:6 x$ ]( y' J$ Y% N( l+ ^
Protection against mechanical
( i" n+ h( ?" b( ^: u; u( h5 `0 \hazards
8 V% T# { c2 r8 B$ yKey words:& Z5 J& T* ?. e5 F
- Guards8 N/ M& B1 g- G$ u0 b
- Access
2 }. \/ n$ l- i9 x/ ~# XDecision taken by
2 t4 l, p6 `! UETF3 and confirmed
( h+ f" {- m- \by CTL at its 38th
3 _: @- r2 y; e" o2 }% i& gmeeting, in Toronto
) ~- g6 V" C: b$ YQuestion:
# s! b F7 n7 ~/ @The requirement states that there must be no access to hazardous moving parts in Normal! S& k6 q) o+ J0 q- Z
Condition and no parts must be expelled in Single Fault Condition. Does this mean it is. C( x, @' |/ C
acceptable to have access to hazardous parts in Single Fault Condition?% d u q. N$ K$ o" M
Decision:9 t6 @, C+ {4 {3 Y' X. C
Mechanical parts are not subject to Single Fault Condition examination.3 G, L8 }; y! h2 A2 ?3 Z7 G# [
Explanation:' k% t. X! R3 y
Specific tests are included in the standard for strength, e.g. impact hammer test, which
2 V- Q1 {8 c8 Q/ I% Qdetermine the acceptable strength of parts. It is not permissible to remove or presume6 `! w. [; B7 y
destruction of mechanical components in simulated Single Fault Conditions in addition to
* _8 [! ?4 K) L+ ~* sthese pre-determined requirements.' S% u7 ?4 L2 g/ Q# B
Where safety of a moving part is determined by an electronic control, for example a speed
! u& G- |% g- }- h. u' mcontrol circuit, then single fault analysis of this circuit must be performed if a hazard could
3 ~& |) M, ]- Q& J" m7 |9 [2 Parise.
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