CLC/TR 50480:2011

Determination of cross-sectional area of conductors and selection of protective devices

This Technical Report applies to low-voltage installations with a nominal system frequency of 50 Hz in which the circuits consist of insulated conductors, cables or busbar trunking systems. It defines the different parameters used for the calculation of the characteristics of electrical wiring systems in order to comply with rules of HD 384/HD 60364. These rules are mainly the following: - current-carrying capacities of the conductors; - characteristics of protective devices in regard to protection against overcurrent; - verification of thermal stress in conductors due to short-circuit current or earth fault current; - fault protection (protection against indirect contact) in TN systems and IT systems; - limitation of voltage drop; - verification of mechanical stresses during short-circuit in busbar trunking systems (BTS) according to EN 60439-2 or powertrack systems according to EN 61534 series. The calculations provided in this Technical Report are only applicable where the characteristics of the circuits are known. For the purpose of this document, when referring to Busbar Trunking Systems, Powertrack Systems are also considered. NOTE 1 Mechanical stress during short-circuit is covered by IEC 60865. NOTE 2 In general these calculations concern supply by HV/LV transformer, but they are also applicable to supply by LV/LV transformer and LV back-up generators. NOTE 3 Effects of harmonics currents are not covered by this document. This Technical Report is also applicable for checking the compliance of the results of calculations performed by software programs for calculation of cross-sectional area of insulated conductors, cross-sectional area of cables and characteristics for selection of busbar trunking systems with HD 384/HD 60364.

Festlegung von Leiterquerschnitten und Auswahl von Schutzeinrichtungen

Détermination des sections des conducteurs et choix des dispositifs de protection

Določanje prereza vodnikov in izbira zaščitnih naprav

To tehnično poročilo velja za nizkonapetostne inštalacije z nazivno frekvenco sistema 50 Hz, pri katerih so vezja sestavljena iz izoliranih prevodnikov, kablov ali zbiralčnih razdelilnih sistemov.
Opredeljuje različne parametre, ki se uporabljajo za izračun značilnosti električnih inštalacijskih sistemov, da ustrezajo pravilom HD 384/HD 60364.
Pravila so v glavnem naslednja:
- zmožnosti prevodnikov za prenos toka;
- značilnosti zaščitnih naprav v zvezi z zaščito pred nadtokom;
- preverjanje termične napetosti v prevodnikih zaradi kratkega stika ali toka zaradi napake pri ozemljitvi;
- zaščita pred okvaro (zaščita pred posrednim stikom) v sistemih TN in sistemih IT;
- omejitev padca napetosti;
- preverjanje mehanske napetosti med kratkim stikom v zbiralčnih razdelilnih sistemih (BTS) v skladu z EN 60439-2 ali tračnih napajalnih sistemih v skladu s serijo EN 61534.
Izračuni, ki jih zagotavlja to tehnično poročilo, veljajo le tam, kjer so znane značilnosti vezja.
Za namen tega dokumenta zbiralčni razdelilni sistemi pomenijo tudi tračne napajalne sisteme.
OPOMBA 1 Mehansko napetost med kratkim stikom zajema IEC 60865.
OPOMBA 2: Na splošno ti izračuni veljajo za napajanje prek transformatorjev VN/NN, veljajo pa tudi za napajanje prek transformatorjev NN/VN in rezervnih generatorjev NN.
OPOMBA 3: Ta dokument ne zajema učinkov harmonskih tokov.
To tehnično poročilo velja tudi za preverjanje skladnosti rezultatov izračunov, ki so jih izvedli računalniški programi za izračun prereza izoliranih prevodnikov, prereza kablov in značilnosti za izbiro zbiralčnih razdelilnih sistemov, s HD 384/HD 60364.

General Information

• Status: Published
• Publication Date: 17-Feb-2011
• ICS: 29.050 - Superconductivity and conducting materials
• ICS: 29.060.01 - Electrical wires and cables in general
• ICS: 29.140.50 - Lighting installation systems
• Technical Committee: CLC/TC 64 - Electrical installations and protection against electric shock
• Drafting Committee: IEC/TC 64 - IEC_TC_64
• Parallel Committee: IEC/TC 64 - IEC_TC_64
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 18-Feb-2011
• Completion Date: 18-Feb-2011
• Ref Project: SIST-TP CLC/TR 50480:2011 - Determination of cross-sectional area of conductors and selection of protective devices

Standards Content (Sample)

SLOVENSKI STANDARD
SIST-TP CLC/TR 50480:2011
01-maj-2011
1DGRPHãþD
SIST R064-003:2000
'RORþDQMHSUHUH]DYRGQLNRYLQL]ELUD]DãþLWQLKQDSUDY
Determination of cross-sectional area of conductors and selection of protective devices
Festlegung von Leiterquerschnitten und Auswahl von Schutzeinrichtungen
Détermination des sections des conducteurs et choix des dispositifs de protection
Ta slovenski standard je istoveten z: CLC/TR 50480:2011
ICS:
29.060.01 (OHNWULþQHåLFHLQNDEOLQD Electrical wires and cables in
VSORãQR general
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
SIST-TP CLC/TR 50480:2011 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP CLC/TR 50480:2011

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SIST-TP CLC/TR 50480:2011

TECHNICAL REPORT
CLC/TR 50480

RAPPORT TECHNIQUE
February 2011
TECHNISCHER BERICHT

ICS 29.050 Supersedes R064-003:1998


English version


Determination of cross-sectional area of conductors and selection of
protective devices



Détermination des sections des Festlegung von Leiterquerschnitten und
conducteurs et choix des dispositifs de Auswahl von Schutzeinrichtungen
protection







This Technical Report was approved by CENELEC on 2011-01-02.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, 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

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TR 50480:2011 E

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SIST-TP CLC/TR 50480:2011
CLC/TR 50480:2011 - 2 -
Foreword

This Technical Report was prepared by CENELEC Technical Committee 64, Electrical installations and
protection against electric shock.
The text of the draft was circulated for voting in accordance with the Internal Regulations, Part 2,
Subclause 11.4.3.3 (simple majority) and was approved by CENELEC as CLC/TR 50480 on
2011-01-13.
This Technical Report supersedes R064-003:1998.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
__________

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SIST-TP CLC/TR 50480:2011
- 3 - CLC/TR 50480:2011
Contents
Foreword . - 2 -
Introduction . - 5 -
1 Scope . - 6 -
2 Reference documents . - 7 -
3 Symbols . - 8 -
4 Parameters . - 13 -
4.1 General . - 13 -
4.2 Conductor resistances . - 15 -
4.3 Conductor reactances. - 15 -
5 Characteristics of installations . - 16 -
6 Characteristics of the supply source . - 19 -
6.1 Voltage . - 19 -
6.2 Supply by HV/LV transformers . - 19 -
6.3 Supply by generators .
...