Electric cables - Calculation of the current rating - Part 3-1: Operating conditions - Site reference conditions

Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English

Published date

08-06-2017

Publisher

International Electrotechnical Committee

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Reference ambient temperatures and thermal
resistivities of soil in various countries
Annex A (informative) - Values relating to the operating
conditions in various countries
Bibliography

IEC 60287-3-1:2017 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition.

IEC 60287-3-1:2017 is applicable to the conditions of steady-state operation of cables at all voltages, buried directly in the ground, in ducts, troughs or in steel pipes, both with and without partial drying-out of the soil, as well as cables in air. The term "steady state" is intended to mean a continuous constant current (100 % load factor) just sufficient to produce asymptotically the maximum conductor temperature, the surrounding ambient conditions being assumed constant. This document defines site reference conditions, however the general values are superseded by specific national requirements. This edition includes the following significant technical changes with respect to the previous edition:
- the updated list of national laying conditions is now covered in Annex A;
- Clause 5 about the information required from the purchaser for the selection of the appropriate type of cable has been removed.

Committee	TC 20
DevelopmentNote	Stability Date: 2021. (06/2017)
DocumentType	Redline
Pages	79
PublisherName	International Electrotechnical Committee
Status	Current
Supersedes	IEC 60287-3-1:1995 IEC 60287-3-1:1995+AMD1:1999 CSV IEC 60287-3-1:1995/AMD1:1999