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标题: DSH 276 Risk of corrosion resulting from contact between earthing terminal and [打印本页]
作者: 小米    时间: 2012-9-14 13:28
标题: DSH 276 Risk of corrosion resulting from contact between earthing terminal and
DSH 276) e9 n$ q4 @5 Q+ Q

7 n. m8 }# G1 B8 `4 U2 O' w		Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conduc ...
# [( u, n6 e' l: q% v		27.4
3 L) s+ F5 m" t1 F) T		60335-1(ed.3)0 u# j# ^' R0 P. \/ K

; ^! I5 Z$ j1 J1 I, q' JStandard: IEC 60335-1:Ed. 3.0 Sub clause: 27.4 Sheet n. 276
9 j& L5 N" }9 B' Y/ tPage 1(1)9 c* j& Z7 _& M4 k' K) `
Subject: Risk of corrosion resulting from contact between earthing terminal and the copper of earthing conductor
# q2 A& D; t8 I8 a2 ]5 nKey words:
9 l( }, S, y! Y( A' t- F- corrosion& b7 U: |0 n  h
- earthing# r$ p5 f. \( O, }: k2 D3 m5 y: L
- electrochemical potential
2 K8 h% Y+ F: w  ]1 `5 l1 jDecision n. 20 taken at 36th meeting/1999- G$ b4 F! p. l& O3 K  ^) ?" W
Question: The checking of the risk of corrosion resulting from contact between earthing
0 O0 i2 N1 C1 [2 lterminal and the copper of the earthing conductor or other metal parts is not always+ ~2 U; y9 Y* f
easy to perform only by inspection, and some standards (e.g. IEC60950:1990, annex
7 B) x8 o+ I- n$ N5 S" j- OJ) make reference to the table of electrochemical potential.
  b: s, M7 y% Q% MDoes this table may be used , and what are the practises to check compliance to this9 b4 _) j3 ^& h7 a
requirement ?) V0 ?7 a# u0 \- Z
Decision: Table of electrochemical potential may be used to verify compliance with
6 @1 k# V+ O- trequirement of 27.4.
" p, t  q8 W4 Q* d, `9 KInformation given by the manufacturer may be also acceptable to verify compliance.8 ]! \5 F/ Y9 ]8 E
. |9 g2 ]/ J/ }# I6 }8 R. M: O
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