DSH 300 Protective Impedance

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DSH 300 - ]# {2 t# }1 n- {2 j# @

Protective Impedance   G( U8 Y& t. N% Z# m& V2 _; a

6.5.3

61010-1(ed.1);am1;am2

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& r* R' a+ R1 d. eStandard:
IEC 61010-1:1990
. H; S4 q! d/ J/ A5 X" r/ p- s+A1:1992+A2:1995
Sub clause:
6.5.3
+ z; Y; L0 H+ X/ C  R6 OSheet n. 300
1 b6 h( m4 ?( O. vPage 1(1)
1 H3 l. X3 Q5 ?( A3 y4 e- E, {) XSubject:
5 i( ~: h& Y; D3 H& XProtective Impedance
Key words:
% F3 V9 M$ Y* M9 F* f! t: i4 a7 h- Shock
4 o+ f1 [6 U& w8 b( H# f7 U0 D( R/ ^- Impedance
; k- M' I1 t7 D9 p4 G- Protective
4 ]: _, @' ~; _$ gDecision taken by
8 {8 q: k* d8 O  E) WETF3 and confirmed
by CTL at its 38th
meeting, in Toronto
Question:
5 W1 y) n, }" F2 pWhere a component acts as protective impedance in single fault condition, should it be rated
$ m# \8 Y6 {9 I0 w* }for this function? An example is a component in an accessible secondary circuit which may
! y3 t* A7 U0 [( U  l6 Hbe made hazardous live by the failure of a creepage or clearance distance.
Decision:
! U7 w9 f& ?0 ]: e5 oSuch components should be rated for the single fault condition.
Explanation:
The safety of the user will be dependent on the operation of these devices. It will, however,
* \# v0 N) j1 o6 E5 O, e' vbe preferable for the design to avoid this circumstance as the integrity of the components is
$ d; y! X% o, ]* b* znot defined.

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