DSH 168A Resistance to corrosion of current-carrying parts

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DSH 168A

Resistance to corrosion of current-carrying parts 7 o( B- T8 G3 u, c, B1 i# C+ p

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Generality , `* Q7 i1 {5 d& ~( O* C1 S* D

Question:
How to judge whether a current-carrying part is resistant to corrosion ?
% B$ k4 R( {7 F6 g( Y& P+ QDecision:
; `1 P, _' m4 H5 ]+ a8 yCEE Recommendation n. 9 “Corrosion of current-carrying parts” may be applied to judge whether a current-carrying part is resistant to corrosion .
It is quoted in CB Bulletin No. 41 (September 1981).
. e0 u% |# D7 \: b% hIn the following, for convenience, is reported a part of it:
RECOMMENDED TEXT, SCREWS, CURRENT-CARRYING PARTS AND CONNECTIONS.
$ ?+ r/ ^4 Z: o' k% w0 ~  l* d0 wa) Current-carrying parts and parts of terminals shall be of a metal having, under the conditions occurring in the equipment, adequate mechanical strength and resistance to corrosion.
% u# V! y# Y; D, [* p. W. {. \3 WCompliance is checked by inspection and, if necessary, by measurement and by chemical analysis.
After all the tests of the relevant specification, the current-carrying parts and parts of terminals shall show no appreciable deformation.
Examples of suitable metals, when used within the permissible temperature range and under normal conditions of chemical pollution, are:
- copper,
- an alloy containing at least 58% copper for parts that are worked cold or at least 50% copper for other parts,
6 \) e  g1 ^- |- stainless steel containing at least 13% chromium and not more than 0,09% carbon,
- steel provided with an electroplated coating of zinc according to ISO Publication 2081-1973, the coating having a thickness of at least:
7 U9 n6 A1 {$ }  P9 U7 G* 5 T ISO grade “1 mild” for ordinary equipment,
* 12 T ISO grade “2 moderate” for jet-proof and splash-proof equipment,
+ ~9 J* e2 T7 R4 {* 25 T ISO grade “3 severe” for jet-proof and watertight equipment.
( i" Z) o/ o2 U2 y- steel provided with an electroplated coating of nickel plus chromium according to ISO Publication 1456-1974, the coating having a thickness at least equal to that specified for:
* N+ d* W8 V8 U' W  V( e* service condition no. 2 for ordinary equipment,
1 }# K2 ~4 n% h8 S3 M1 S: z* service condition no. 3 for drip-proof and splash-proof equipment,
3 q6 h' g+ u) H. i- T( n! g* service condition no. 4 for jet-proof and watertight equipment.
; g9 {! t6 U( i1 D2 J& D0 ~0 V- Aluminium and its alloys, provided special measures are taken for removing, where necessary, the oxide layer, for obtaining a sufficient and durable contact pressure and for ensuring that the point of connection withstands the corrosion test specified;
0 Y! Y8 m# H- U+ R' l! V; O  d0 Khowever, until a suitable corrosion test and an electrical performance test are available, aluminium and its alloys should preferably not be used for current-carrying parts and terminals within the equipment.
Zinc and other metals which are soft or liable to creep are not considered to be suitable for current-carrying parts and terminals .
The thickness of the electroplated coatings on steel may be determined by the magnetic method described in ISO Publication 2178-1972, or by microscopical
2 g8 y; s- W6 t$ G% bmeasurement described in ISO Publication 1463-1973.
b) Under moist conditions, metals showing a great difference of electrochemical potential with respect to each other shall not be used in contact with each other .
Compliance is checked by inspection.
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