IEC 60287-2-3:2017
Superseded
View Superseded by
Electric cables - Calculation of the current rating - Part 2-3: Thermal resistance - Cables installed in ventilated tunnels
Hardcopy , PDF
English - French
04-11-2017
06-28-2024
IEC TS 62933-2-3:2025
IEC 60287-2-3:2024
IEC 60287-2-3:2024 RLV
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Description of method
5 Formulae for air properties
6 Temperature profile
Annex A (informative) - Calculation example
Annex B (informative) - Delta-star transformation
Annex C (informative) - Calculation of F[m] coefficient
Bibliography
IEC 60287-2-3:2017 describes a method for calculating the continuous current rating factor for cables of all voltages installed in ventilated tunnels. The method is applicable to any type of cable.
The method applies to natural as well as forced ventilation.
Longitudinal heat transfer within the cables and the surroundings of the tunnel is assumed to be negligible.
All cables are assumed to be identical within the tunnel and it is assumed that the tunnel cross-section does not change with distance along the tunnel.
| Committee |
TC 20
|
| DevelopmentNote |
Stability Date: 2021. (04/2017)
|
| DocumentType |
Standard
|
| Pages |
49
|
| PublisherName |
International Electrotechnical Committee
|
| Status |
Superseded
|
| SupersededBy |
| Standards | Relationship |
| BS IEC 60287-2-3:2017 | Identical |
| NEN IEC 60287-2-3 : 2017 | Identical |
| DS IEC 60287-2-3 : 2017 | Identical |
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