IEC 60426:2007
Current
The latest, up-to-date edition.
Electrical insulating materials - Determination of electrolytic corrosion caused by insulating materials - Test methods
Hardcopy , PDF
English, English - French
29-01-2007
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General description of the test method
5 Test specimens
5.1 General
5.2 Cut surfaces of rigid materials (blocks, plates,
sheets or semi-finished materials)
5.3 Cast, moulding, injection and pressed materials
5.4 Cut surfaces of flexible films, foils and thin
sheets
5.5 Adhesive tapes
5.6 Flexible sleeving and tubing
5.7 Lacquers and insulating varnishes
5.8 Cleanliness of contact surfaces
5.9 Number of test specimens
6 Test strips
6.1 General
6.2 Preparation of the test strips
6.3 Cleanliness of test strips
7 Test device
8 Test conditions
9 Test procedure
10 Evaluation
10.1 General evaluation
10.2 Visual inspection of the test strips
10.3 Tensile strength of test strips
11 Evaluation of corrosion on copper strips
12 Test report
Annex A (normative) Tables for the evaluation of corrosion
on brass and aluminium strips
Annex B (informative) Notes on visual evaluation
Annex C (informative) Copper wire tensile strength method
IEC 60426:2007 determines the ability of insulating materials to produce electrolytic corrosion on metals being in contact with them under the influence of electric stress, high humidity and elevated temperature. The effect of electrolytic corrosion is assessed in one test by using consecutively two methods:
- visual semi-quantitative method consisting in comparing visually the corrosion appearing on the anode and cathode metal strips, with those given in the reference figures. This method consists of the direct visual assessment of the degree of corrosion of two copper strips, acting as anode and cathode respectively, placed in contact with the tested insulating material under a d.c. potential difference at specified environmental conditions. The degree of corrosion is assessed by visually comparing the corrosion marks on the anode and cathode metal strips with those shown in the reference figures;
- quantitative method, which involves the tensile strength measurement, carried out on the same anode and cathode metal strips after visual inspection.
An additional quantitative test method for determining electrolytic corrosion, which involves tensile strength measurement of copper wire, is described in the informative Annex C.
| Committee |
TC 112
|
| DevelopmentNote |
Stability Date: 2020. (11/2012)
|
| DocumentType |
Standard
|
| Pages |
26
|
| PublisherName |
International Electrotechnical Committee
|
| Status |
Current
|
| Supersedes |
| Standards | Relationship |
| NEN EN IEC 60426 : 2007 | Identical |
| I.S. EN 60426:2007 | Identical |
| PN EN 60426 : 2007 | Identical |
| DIN EN 60426 : 2007 COR 1 2010 | Identical |
| VDE 0303-6 : 2007 COR 1 2010 | Identical |
| BIS IS 8516 : 2011(R2016) | Identical |
| BS EN 60426:2007 | Identical |
| CEI EN 60426 : 2007 | Identical |
| EN 60426:2007 | Identical |
| UNE-EN 60426:2007 | Identical |
| AS 3532-1988 | Identical |
| NFC 26 260 : 1974 | Identical |
| UNE 21362:1978 | Identical |
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