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

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DSH 276 / @: D- k, ~( U8 {! v

Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conduc ... ' v: G( D1 |5 {1 l. q

27.4

60335-1(ed.3)

5 W& n% _9 \2 h; u( ?0 yStandard: IEC 60335-1:Ed. 3.0 Sub clause: 27.4 Sheet n. 276
. N2 k" d1 T$ T. s5 cPage 1(1)
Subject: Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conductor
Key words:
- corrosion
- earthing
5 T: f6 G; N( h( M) \& _- electrochemical potential
Decision n. 20 taken at 36th meeting/1999
Question: The checking of the risk of corrosion resulting from contact between earthing
+ G% k. U$ p5 Qterminal 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
$ e1 m7 O7 T% }2 Q) X/ W- o6 K9 J' fJ) make reference to the table of electrochemical potential.
7 Y) }8 f! R0 @* X8 S. C% @Does this table may be used , and what are the practises to check compliance to this
requirement ?
7 q$ A7 `( U' [/ M" E* o6 Z. JDecision: Table of electrochemical potential may be used to verify compliance with
4 S2 U; p; f' L% m  yrequirement of 27.4.
% h9 D3 Y$ ~! zInformation given by the manufacturer may be also acceptable to verify compliance.
6 m: s3 {" x3 @8 t7 }

) X/ N" U, J9 P* K0 v! m