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9 l& S# t& x# |% f& I5 k' M l, ? |  DSH 306# _$ Z% ?" v# K/ n' S3 A
| Protection against Mechanical Hazards7 [% @. Z2 f6 q% T; i3 O; i
| 7.1
+ o* s& l6 a; R$ G/ o, e | 61010-1(ed.1);am1;am2 s9 \0 \% N8 o7 W+ K
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0 n! `+ {/ D+ M5 z7 G( c8 ~+ h8 w3 eStandard:
: ~5 z: t- U8 ^2 O8 Y2 o% }2 WIEC 61010-
7 q& y# S) @ C' h$ w1:1990+A1:1992+A2:1995
, N- a$ i+ ?. h* aSub clause:9 {, `/ w. ?0 d" |5 V
7.1
' z6 @( L, Z* ]& K: ?Sheet n. 306
S9 o' b& d4 }; R* ]Page 1(1): V- @ J: o. t* L; A
Subject:
) Q+ S }' |5 V3 {' HProtection against mechanical6 I" S3 _6 g \; ?. j
hazards+ e+ O7 K) b6 r) b3 Z4 n, |- m
Key words:
) j! h2 t4 D8 s8 n0 m- Guards( Z4 Q9 S: E" a' p
- Access
+ p! X. l) s8 MDecision taken by
6 T* P/ d6 g% Z+ J! M" hETF3 and confirmed
- q ~; }3 i' w- ~4 _2 E |by CTL at its 38th
+ p$ d5 b! c0 f% w# U" kmeeting, in Toronto8 Z. t5 _+ d" X2 x: S8 U2 S O# N7 y
Question:) Q$ f6 _# k; R s# g* F/ S
The requirement states that there must be no access to hazardous moving parts in Normal' {% X4 I! k! v3 Y
Condition and no parts must be expelled in Single Fault Condition. Does this mean it is
1 ~" j) m( I6 c# D+ J4 q; l3 _acceptable to have access to hazardous parts in Single Fault Condition?5 w/ {$ j2 J3 \( w6 J& P$ q
Decision:3 p6 }. }' ?2 d, G1 H& a2 u0 N
Mechanical parts are not subject to Single Fault Condition examination.
9 Z' p5 m# \9 D. M( UExplanation:
! o9 K' \+ [0 L% h# z F$ L) aSpecific tests are included in the standard for strength, e.g. impact hammer test, which8 q/ D4 ]2 C* h+ N
determine the acceptable strength of parts. It is not permissible to remove or presume$ ?+ U/ s2 x; t+ z5 T2 c
destruction of mechanical components in simulated Single Fault Conditions in addition to7 o) Z. o8 ~7 e: x' e) d
these pre-determined requirements.
9 v/ A! f' I3 oWhere safety of a moving part is determined by an electronic control, for example a speed
3 H+ }9 p2 W" X# y0 xcontrol circuit, then single fault analysis of this circuit must be performed if a hazard could, J6 J. E9 U' a0 L; N ^1 ]
arise.
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