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 ... 5 `) F: O0 |7 I- X: v

27.4 # D5 i: O+ F7 U8 \4 c

60335-1(ed.3)

5 X, |- H$ p/ ~4 u; [# e3 `Standard: IEC 60335-1:Ed. 3.0 Sub clause: 27.4 Sheet n. 276
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# F. k/ N# D! m- M/ NSubject: Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conductor
1 w" u& T+ z6 D1 x- A  dKey words:
- corrosion
) [; [$ r4 ~, {% a" |+ f2 G+ u* w- earthing
- electrochemical potential
/ G% b+ Z% s1 y' PDecision n. 20 taken at 36th meeting/1999
Question: The checking of the risk of corrosion resulting from contact between earthing
/ g& V6 M! [' x5 y7 l4 g' h3 E% t! Hterminal 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.
3 I6 D0 Y/ J) v0 @Does this table may be used , and what are the practises to check compliance to this
requirement ?
! Q. f. Y4 q" f/ d$ t4 HDecision: 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.
1 {* d; B/ e3 |6 S2 j# y' w
& Q5 x' |7 R3 c: c7 h. a" r7 W# D
4 V* C4 w% N3 V+ v) B