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

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DSH 276 8 X8 K8 J# O) i0 |! J/ F * P4 m) s' x9 s

Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conduc ...

27.4 + L& J* f& Y& V% y

60335-1(ed.3) * V) H% W2 q3 a: I- ]

Standard: IEC 60335-1:Ed. 3.0 Sub clause: 27.4 Sheet n. 276
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% v7 Q5 y1 r3 R: m9 {4 qSubject: Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conductor
( H% L/ }7 P! Q; }3 sKey words:
- corrosion
- earthing
- electrochemical potential
Decision n. 20 taken at 36th meeting/1999
3 V* H1 `6 ]' [* w* g( QQuestion: The checking of the risk of corrosion resulting from contact between earthing
9 M5 \& L8 r! A4 V' e1 Y# Zterminal and the copper of the earthing conductor or other metal parts is not always
' c5 ^$ B; T7 l2 s( F3 B% }5 Leasy to perform only by inspection, and some standards (e.g. IEC60950:1990, annex
J) make reference to the table of electrochemical potential.
7 Q8 \7 b  v+ |! U$ L% [Does this table may be used , and what are the practises to check compliance to this
* b) N2 |) z% {  R. Q2 orequirement ?
, N: r1 J. f. c; T! w. ~/ J2 ~Decision: 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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