Electric cables - Calculation of the current rating - Part 3-3: Sections on operating conditions - Cables crossing external heat sources

Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English - French, Spanish, Castilian

Published date

05-15-2007

Publisher

International Electrotechnical Committee

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Symbols
4 Description of method
  4.1 General description
  4.2 Single source crossing
  4.3 Several crossings
  4.4 Rating of two crossing cables
Annex A (informative) Example calculation
Annex B (informative) Temperature rise calculation
        at any point along the route

Describes a method for calculating the continuous current rating factor for cables of all voltages where crossings of external heat sources are involved. The method is applicable to any type of cable.The method assumes that the entire region surrounding a cable, or cables, has uniform thermal characteristics and that the principle of superposition applies. The principle of superposition does not strictly apply to touching cables and hence the calculation method set out in this standard will produce an optimistic result if applied to touching cables

Committee	TC 20
DevelopmentNote	Stability Date: 2019. (09/2017)
DocumentType	Standard
Pages	33
PublisherName	International Electrotechnical Committee
Status	Current

Standards	Relationship
CEI 20-21/3-3 : 2007	Identical
BS IEC 60287-3-3:2007	Identical
NEN IEC 60287-3-3 : 2007	Identical
UNE 21144-3-3:2007	Identical
GOST R IEC 60287-3-3 : 2011	Identical