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 ...   j+ }  R4 v4 f* ^) m$ N5 u

27.4

60335-1(ed.3) ) Q8 ^* ?" m2 R' u

7 \; ^& d0 G1 Y+ hStandard: IEC 60335-1:Ed. 3.0 Sub clause: 27.4 Sheet n. 276
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( f! H4 Q% z& z5 r( \. @" ySubject: Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conductor
Key words:
2 a0 B7 h7 s0 r5 J' P- corrosion
- earthing
+ l4 a% c+ j7 z' z2 X- electrochemical potential
Decision n. 20 taken at 36th meeting/1999
Question: The checking of the risk of corrosion resulting from contact between earthing
terminal 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.
2 Y+ W+ X9 x( ~7 G4 P; z. J  _Does this table may be used , and what are the practises to check compliance to this
+ c, @3 g" ~9 Trequirement ?
, S8 w: O: P* R0 ~0 l: f* ^/ uDecision: Table of electrochemical potential may be used to verify compliance with
& `, t% p7 X/ F7 @4 arequirement of 27.4.
Information given by the manufacturer may be also acceptable to verify compliance.
+ ?/ X. e* z4 I- ]) L, R
$ l  }, q" K, j) l
0 O& i; I0 r* G4 K  w# o8 @- a3 K