DSH 276 Risk of corrosion resulting from contact between earthing terminal and

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DSH 276

Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conduc ... & O& a( `' M) E" g2 Q

27.4

60335-1(ed.3) - @' Y2 M2 h! V7 f7 F  w6 |& `

2 {, W0 L% q1 qStandard: IEC 60335-1:Ed. 3.0 Sub clause: 27.4 Sheet n. 276
6 Z$ {. y! x0 sPage 1(1)
Subject: Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conductor
: ^5 p- s0 A0 @Key words:
- corrosion
! J4 V% M  x* ~# S- earthing
1 O. |6 K& f0 _' k- electrochemical potential
0 _0 P8 v+ F$ w  i$ `% xDecision n. 20 taken at 36th meeting/1999
) B" ^6 w3 G3 ]# x4 v+ WQuestion: The checking of the risk of corrosion resulting from contact between earthing
& h+ K3 T2 B( f* @$ D5 Z* \! Xterminal and the copper of the earthing conductor or other metal parts is not always
easy to perform only by inspection, and some standards (e.g. IEC60950:1990, annex
J) make reference to the table of electrochemical potential.
- ?  J# I. q2 V+ Q! LDoes this table may be used , and what are the practises to check compliance to this
requirement ?
7 l0 v& E2 R- }6 Q. [/ K! YDecision: Table of electrochemical potential may be used to verify compliance with
requirement of 27.4.
Information given by the manufacturer may be also acceptable to verify compliance.


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