BSI PD IEC/TS 62257-5:2015 – TC:2020 Edition
$246.62
Tracked Changes. Recommendations for renewable energy and hybrid systems for rural electrification – Protection against electrical hazards
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 105 |
IEC TS 62257-5:2015(E) specifies the general requirements for the protection of persons and equipment against electrical hazards to be applied in decentralised rural electrification systems. Requirements dealing with protection against electric shock are based on basic rules from IEC 61140 and IEC 60364. Decentralized Rural Electrification Systems are designed to supply electric power for sites which are not connected to a large interconnected system, or a national grid, in order to meet basic needs. Examples of such sites: isolated dwellings, village houses, community services, economic activities, etc. The main technical changes with regard to the previous edition are as follows: – redefine the maximum AC voltage from 500 V to 1 000 V, the maximum DC voltage from 750 V to 1 500 V; – removal of the limitation of 100 kVA system size. This publication is to be read in conjunction with /2.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 59 | CONTENTS |
| 62 | FOREWORD |
| 64 | INTRODUCTION |
| 65 | 1 Scope 2 Normative references |
| 66 | 3 Terms and definitions |
| 68 | 4 Classification of decentralised rural electrification systems 5 Protection against electric shock 5.1 General 5.2 Requirements on the d.c. side of a DRES Tables Table 1 – Typology of decentralized electrification systems |
| 69 | 5.3 Requirements on the a.c. side of a DRES 5.3.1 General 5.3.2 TT system 5.3.3 TN system Table 2 – Rated operating residual current of the protective device depending on the value of the earthing resistance |
| 70 | 6 Protection against overcurrent 6.1 General 6.2 Protection against overload currents 6.3 Protection against short-circuits 7 Protection against risk of fire |
| 71 | 8 Protection against effects of lightning 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) 9.1 General 9.2 Operational conditions and external influences |
| 72 | 9.3 Wiring system 9.4 Isolation and switching 9.4.1 Isolation |
| 73 | 9.4.2 Over-current protective devices Table 3 – Number of protected poles with regard to the characteristics of the distribution system |
| 74 | 9.4.3 Residual Current Devices (RCD) 9.5 Surge protective devices |
| 75 | 9.6 Earthing arrangement, protective conductors and protective bonding conductors 9.6.1 Earth electrodes |
| 76 | 9.6.2 Protective bonding conductors 10 Verification 11 Operation and maintenance |
| 77 | Annexes Annex A (informative) Protection against electric shock in electrical installations A.1 Protection against electric shock A.2 Automatic disconnection of supply A.2.1 General |
| 78 | A.2.2 In TN systems A.2.3 In TT systems |
| 79 | A.3 Double or reinforced insulation A.4 Extra-low-voltage (SELV and PELV) A.5 Electrical separation |
| 80 | A.6 Additional protection |
| 81 | Annex B (informative) Types of LV distribution systems earthing B.1 Terms and definitions Figures Figure B.1 – General outline of the distribution system |
| 82 | B.2 Types of system earthing used in DRES (Figures are from IEC 60364-1:2005) B.2.1 General Figure B.2 – Distribution system of the smallest type |
| 84 | B.2.2 AC TN systems |
| 85 | Figure B.3 – TN-S system 3-phase, 4-wire with separate neutral conductor and protective conductor throughout the distribution system |
| 86 | Figure B.4 – TN-S system 3-phase, 3-wire with separate earthed line conductor and protective conductor throughout the distribution system |
| 87 | Figure B.5 – TN-S system 3-phase, 3-wire with protective conductor and no distributed neutral conductor throughout the distribution system |
| 88 | 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 |
| 89 | 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 |
| 90 | 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 |
| 91 | B.2.3 AC TT systems Figure B.10 – TN-S multiple source system 3-phase, 4-wire with separate protective conductor and neutral conductor to current using equipment |
| 92 | 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 |
| 93 | B.2.4 DC distribution systems |
| 94 | Figure B.13 – TN-S d.c. system |
| 95 | Figure B.14 – TN-C d.c. system |
| 96 | Figure B.15 – TN-C-S d.c. system |
| 97 | Figure B.16 – TT d.c. system |
| 98 | Annex C (informative) Classification of electrical equipment C.1 Classification of residual current devices (RCDs) (see IEC 61008, IEC 61009, IEC 60755, IEC 60947-2, IEC 62423) |
| 99 | C.2 Classification of circuit breakers for a.c. operation (see IEC 60898-1, IEC 60947-2) |
| 100 | C.3 Classification of surge protective devices (see IEC 61643-11) |
| 101 | Annex D (informative) General information concerning protection against lightning D.1 General Figure D.1 – Example of effects of a lightning stroke |
| 102 | D.2 Protection against lightning – Principles |
| 103 | Bibliography |
Related products
-
BSI PD IEC/TS 62257-1:2015 – TC:2020 Edition
Tracked Changes. Recommendations for renewable energy and hybrid systems for rural electrification – General introduction…
-
BSI PD IEC/TS 62257-5:2015:2016 Edition
Recommendations for renewable energy and hybrid systems for rural electrification – Protection against electrical hazards…
