CLC/TR 50479:2007

SLOVENSKI STANDARD
01-oktober-2007
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SIST R064-002:2000
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Electrical installation guide - Selection and erection of electrical equipment - Wiring
systems - Limitation of temperature rise of connecting interfaces
Leitfaden für elektrische Anlagen - Auswahl und Errichtung elektrischer Betriebsmittel -
Kabel- und Leitungsanlagen - Begrenzung des Temperaturanstiegs bei
Schnittstellenanschlüssen
Guide pour les installations électriques - Choix et mise en oeuvre des matériels
électriques - Canalisations - Limitation des échauffements dus aux interfaces de
connexion
Ta slovenski standard je istoveten z: CLC/TR 50479:2007
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CLC/TR 50479
RAPPORT TECHNIQUE
March 2007
TECHNISCHER BERICHT
ICS 13.260; 91.140.50 Supersedes R064-002:1994

English version
Electrical installation guide -
Selection and erection of electrical equipment -
Wiring systems -
Limitation of temperature rise of connecting interfaces

Guide pour les installations électriques -  Leitfaden für elektrische Anlagen -
Choix et mise en oeuvre Auswahl und Errichtung
des matériels électriques - elektrischer Betriebsmittel -
Canalisations - Kabel- und Leitungsanlagen -
Limitation des échauffements Begrenzung des Temperaturanstiegs
dus aux interfaces de connexion bei Schnittstellenanschlüssen

This Technical Report was approved by CENELEC on 2006-10-09.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TR 50479:2007 E
Foreword
This Technical Report was prepared by SC 64B, Protection against thermal effects, of Technical Committee
CENELEC TC 64, Electrical installations and protection against electric shock.

The text of the draft was submitted to a vote and was approved by CENELEC as CLC/TR 50479 on
2006-10-09.
This Technical Report supersedes R064-002:1994.
__________
- 3 - CLC/TR 50479:2007
INTRODUCTION
When designing an installation or during initial verification, it is sometimes observed that the temperatures
reached by interfaces between terminals and conductors are higher than those which could be withstood by
insulation in normal service.
In this case, precautions shall be taken so that the temperature attained by terminals in normal service shall
not impair effectiveness of the insulation of conductors connected to them or supporting them.

See HD 384.5.52 ‘Electrical installations of buildings – Part 5: Selection and erection of electrical equipment
– Chapter 52: Wiring systems’.

52.1 General
52.1.1 Scope
This Technical Report is for use as a guide for electrical installations. It is applicable to the limitation of
temperature rises of connecting interfaces.

52.1.2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

EN 60439-1:1999, Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested and partially
type-tested assemblies (IEC 60439-1:1999)

EN 60439-3:1991, Low-voltage switchgear and controlgear assemblies - Part 3: Particular requirements for
low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled
persons have access for their use - Distribution boards (IEC 60439-3:1990, modified)

HD 384.5.523 S2:2001, Electrical installations of buildings - Part 5: Selection and erection of electrical
equipment - Section 523: Current-carrying capacities in wiring systems
(IEC 60364-5-523:1999, modified)

CLC/TR 60890:2002, A method of temperature-rise assessment by extrapolation for partially type-tested
assemblies (PTTA) of low-voltage switchgear and controlgear (IEC 60890:1987 + corr. 1988 + A1:1995)

IEC/TR 60943:1998, Guidance concerning the permissible temperature rise for parts of electrical equipment,
in particular for terminals
52.2 Maximum temperatures of terminals in normal service conditions

52.2.1 The temperature of a terminal is the sum of the ambient temperature and its temperature rise in
normal service.
Product standards give conventional limit values for temperature rise under defined test conditions, but do
not indicate, in general, limits for permissible temperature rises in service conditions.

Relevant standards in this resp
...