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

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DSH 276 5 I* t) q: n/ C5 T: K6 D" \  P! y

Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conduc ... 9 D; H( U/ d% l

27.4

60335-1(ed.3)

Standard: IEC 60335-1:Ed. 3.0 Sub clause: 27.4 Sheet n. 276
+ a) L6 [& I$ G) ]+ ZPage 1(1)
Subject: Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conductor
) r* A3 U7 ?; a  B6 F, wKey words:
9 C- k' |/ Q: d& C' ]- corrosion
- earthing
" j. W: r) ]3 D- 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
; G  e, _, y4 Y, D& N% c9 \easy to perform only by inspection, and some standards (e.g. IEC60950:1990, annex
% X1 e; @, a& a0 ~* q; M6 b0 T2 t9 GJ) make reference to the table of electrochemical potential.
# |. ?! I9 P% {+ F7 KDoes this table may be used , and what are the practises to check compliance to this
requirement ?
Decision: Table of electrochemical potential may be used to verify compliance with
+ _+ `7 `8 E- E# S0 i! Z( Urequirement of 27.4.
" V! o. }3 U2 C4 VInformation given by the manufacturer may be also acceptable to verify compliance.

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