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PD IEC/TS 62257-5:2015 Recommendations for renewable energy and hybrid systems for rural electrification - Protection against electrical hazards, 2016
- 30321873-VOR.pdf [Go to Page]
- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Classification of decentralised rural electrification systems
- 5 Protection against electric shock [Go to Page]
- 5.1 General
- 5.2 Requirements on the d.c. side of a DRES
- 5.3 Requirements on the a.c. side of a DRES [Go to Page]
- 5.3.1 General
- 5.3.2 TT system
- 5.3.3 TN system
- 6 Protection against overcurrent [Go to Page]
- 6.1 General
- 6.2 Protection against overload currents
- 6.3 Protection against short-circuits
- 7 Protection against risk of fire
- 8 Protection against effects of lightning [Go to Page]
- 8.1 Principle
- 8.2 Examples
- 8.3 Protection against overvoltage
- 8.4 Protection against direct lightning
- 9 Determination of the pick up area of a rod or wire (see IEC 62305-3:2010) [Go to Page]
- 9.1 General
- 9.2 Operational conditions and external influences
- 9.3 Wiring system
- 9.4 Isolation and switching [Go to Page]
- 9.4.1 Isolation
- 9.4.2 Over-current protective devices
- 9.4.3 Residual Current Devices (RCD)
- 9.5 Surge protective devices
- 9.6 Earthing arrangement, protective conductors and protective bonding conductors [Go to Page]
- 9.6.1 Earth electrodes
- 9.6.2 Protective bonding conductors
- 10 Verification
- 11 Operation and maintenance
- Annexes [Go to Page]
- Annex A (informative) Protection against electric shock in electrical installations [Go to Page]
- A.1 Protection against electric shock
- A.2 Automatic disconnection of supply [Go to Page]
- A.2.1 General
- A.2.2 In TN systems
- A.2.3 In TT systems
- A.3 Double or reinforced insulation
- A.4 Extra-low-voltage (SELV and PELV)
- A.5 Electrical separation
- A.6 Additional protection
- Annex B (informative) Types of LV distribution systems earthing [Go to Page]
- B.1 Terms and definitions
- B.2 Types of system earthing used in DRES (Figures are from IEC 60364-1:2005) [Go to Page]
- B.2.1 General
- B.2.2 AC TN systems
- B.2.3 AC TT systems
- B.2.4 DC distribution systems
- Annex C (informative) Classification of electrical equipment [Go to Page]
- C.1 Classification of residual current devices (RCDs) (see IEC 61008, IEC 61009, IEC 60755, IEC 60947-2, IEC 62423)
- C.2 Classification of circuit breakers for a.c. operation (see IEC 60898-1, IEC 60947-2)
- C.3 Classification of surge protective devices (see IEC 61643-11)
- Annex D (informative) General information concerning protection against lightning [Go to Page]
- D.1 General
- D.2 Protection against lightning – Principles
- Bibliography
- Figures [Go to Page]
- Figure B.1 – General outline of the distribution system
- Figure B.2 – Distribution system of the smallest type
- Figure B.3 – TN-S system 3-phase, 4-wire with separate neutral conductor and protective conductor throughout the distribution system
- Figure B.4 – TN-S system 3-phase, 3-wire with separate earthed line conductor and protective conductor throughout the distribution system
- Figure B.5 – TN-S system 3-phase, 3-wire with protective conductor and no distributed neutral conductor throughout the distribution system
- Figure B.6 – TN-C-S system 3-phase, 4-wire where the PEN conductor is separatedinto the protective conductor PE and the neutral conductor Nelsewhere in the electrical installation
- Figure B.7 – TN-C-S system 3-phase, 4-wire where the PEN conductor is separatedinto the protective conductor PE and the neutral conductor Nat the origin of the electrical installation
- Figure B.8 – TN-C-S system – single-phase, 2-wire where the PEN conductor is separated into the protective conductor PE and the neutral conductor Nat the origin of the electrical installation
- Figure B.9 – TN-C system 3-phase, 4-wire with neutral and protective conductor functions combined in a single conductor throughout the distribution system
- Figure B.10 – TN-S multiple source system 3-phase, 4-wire with separate protective conductor and neutral conductor to current using equipment
- Figure B.11 – TT system 3-phase, 4-wire with earthed protective conductor and neutral conductor throughout the distribution system
- Figure B.12 – TT system 3-phase, 3-wire with earthed protective conductor and no distributed neutral conductor throughout the distribution system
- Figure B.13 – TN-S d.c. system
- Figure B.14 – TN-C d.c. system
- Figure B.15 – TN-C-S d.c. system
- Figure B.16 – TT d.c. system
- Figure D.1 – Example of effects of a lightning stroke
- Tables [Go to Page]
- Table 1 – Typology of decentralized electrification systems
- Table 2 – Rated operating residual current of the protective device depending on the value of the earthing resistance
- Table 3 – Number of protected poles with regard to the characteristics of the distribution system [Go to Page]
