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

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DSH 276 ; S( M3 J3 i1 G; P! F0 u

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

27.4

60335-1(ed.3)

Standard: IEC 60335-1:Ed. 3.0 Sub clause: 27.4 Sheet n. 276
Page 1(1)
Subject: Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conductor
1 o9 \# C/ H. o8 |Key words:
. I. L/ u# w+ S5 @. Z* S- corrosion
- earthing
- electrochemical potential
; h4 i- U, n8 c$ `' XDecision n. 20 taken at 36th meeting/1999
7 Z  o+ P* q1 ]0 `! nQuestion: The checking of the risk of corrosion resulting from contact between earthing
, o3 K- I' Y3 t: n7 |, \2 Lterminal and the copper of the earthing conductor or other metal parts is not always
4 F- W) P# k- W! L. J6 W; Weasy to perform only by inspection, and some standards (e.g. IEC60950:1990, annex
  i8 J# b" B+ u& v- tJ) make reference to the table of electrochemical potential.
8 v& `" {6 |! B0 D6 ?1 CDoes this table may be used , and what are the practises to check compliance to this
) \! s& Q0 B6 `' I0 l+ \" xrequirement ?
- u) j" w8 u- `% ]Decision: Table of electrochemical potential may be used to verify compliance with
requirement of 27.4.
; x/ t- f9 s1 E2 @  `Information given by the manufacturer may be also acceptable to verify compliance.
8 u( ~! t4 |$ k8 f, D. T# A3 C$ U