CLC/TR 50480:2011
Current
The latest, up-to-date edition.
Determination of cross-sectional area of conductors and selection of protective devices
18-02-2011
Foreword
Introduction
1 Scope
2 Reference documents
3 Symbols
4 Parameters
5 Characteristics of installations
6 Characteristics of the supply source
7 Characteristics of protective devices
8 Protection against overload currents
9 Determination of breaking capacity of protective devices
10 Ability to withstand electro-dynamic stresses for busbar
trunking systems
11 Fault protection (protection against indirect contact)
12 Verification of thermal stress in conductors
13 Voltage drop
Annex A - Conductor resistances
Bibliography
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.
| Committee |
CLC/TC 64
|
| DevelopmentNote |
Supersedes R064-003. (02/2011)
|
| DocumentType |
Technical Report
|
| PublisherName |
European Committee for Standards - Electrical
|
| Status |
Current
|
| Supersedes |
| Standards | Relationship |
| NEN NPR CLC/TR 50480 : 2011 | Identical |
| S.R. CLC/TR 50480:2011 | Identical |
| PD CLC/TR 50480:2011 | Identical |
| CEI EN CLC/ TR 50480:2024 | Identical |
| IEC 60364-5-54:2011 | Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors |
| IEC 60364-4-43:2008 | Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent |
| IEC 60228:2004 | Conductors of insulated cables |
| HD 60364-4-43:2010 | Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent |
| IEC 60724:2000+AMD1:2008 CSV | Short-circuit temperature limits of electric cables with rated voltages of 1 kV (<em>U</em><sub>m</sub> = 1,2 kV) and 3 kV (<em>U</em><sub>m</sub> = 3,6 kV) |
| IEC 60364-4-41:2005+AMD1:2017 CSV | Low voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock |
| EN 61439-1:2011 | Low-voltage switchgear and controlgear assemblies - Part 1: General rules |
| IEC 60439-2:2000+AMD1:2005 CSV | Low-voltage switchgear and controlgear assemblies - Part 2: Particular requirements for busbar trunking systems (busways) |
| IEC 60269-2:2013+AMD1:2016 CSV | Low-voltage fuses - Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly for industrial application) - Examples of standardized systems of fuses A to K |
| IEC 60364-5-53:2001+AMD1:2002+AMD2:2015 CSV | Electrical installations of buildings - Part 5-53: Selection and erection of electrical equipment - Isolation, switching and control |
| HD 60364-4-41:2017/A11:2017 | LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-41: PROTECTION FOR SAFETY - PROTECTION AGAINST ELECTRIC SHOCK |
| EN 60228:2005 COR 2005 | CONDUCTORS OF INSULATED CABLES |
| IEC 60269-1:2006+AMD1:2009+AMD2:2014 CSV | Low-voltage fuses - Part 1: General requirements |
| IEC 60269-3:2010+AMD1:2013 CSV | Low-voltage fuses - Part 3: Supplementary requirements for fuses foruse by unskilled persons (fuses mainly for household or similar applications) - Examples of standardized systems of fuses A to F |
| IEC 60439-1:1999+AMD1:2004 CSV | Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested and partially type-tested assemblies |
| EN 60439-1:1999/A1:2004 | LOW VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PART 1 - TYPE TESTED AND PARTIALLY TYPE TESTED ASSEMBLIES |
| HD 384.5.54 : 200S1 | ELECTRICAL INSTALLATION OF BUILDINGS - SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - EARTHING ARRANGEMENTS AND PROTECTIVE CONDUCTORS |
| HD 60269-2:2013 | Low-voltage fuses - Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly for industrial application) - Examples of standardized systems of fuses A to K |
| IEC 61439-1:2011 | Low-voltage switchgear and controlgear assemblies - Part 1: General rules |
| IEC 60947-2:2016 | Low-voltage switchgear and controlgear - Part 2: Circuit-breakers |
| EN 60947-2:2017 | Low-voltage switchgear and controlgear - Part 2: Circuit-breakers |
| HD 60269-3:2010/A1:2013 | LOW-VOLTAGE FUSES - PART 3: SUPPLEMENTARY REQUIREMENTS FOR FUSES FOR USE BY UNSKILLED PERSONS (FUSES MAINLY FOR HOUSEHOLD AND SIMILAR APPLICATIONS) - EXAMPLES OF STANDARDIZED SYSTEMS OF FUSES A TO F |
| EN 60439-2:2000/A1:2005 | LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PART 2: PARTICULAR REQUIREMENTS FOR BUSBAR TRUNKING SYSTEMS (BUSWAYS) |
| IEC 60364-5-52:2009 | Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems |
| EN 60269-1:2007/A2:2014 | LOW-VOLTAGE FUSES - PART 1: GENERAL REQUIREMENTS (IEC 60269-1:2006/A2:2014) |
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