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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 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 \u2013 Typology of decentralized electrification systems <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 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 \u2013 Rated operating residual current of the protective device depending on the value of the earthing resistance <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 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\u00a062305-3:2010) 9.1 General 9.2 Operational conditions and external influences <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 9.3 Wiring system 9.4 Isolation and switching 9.4.1 Isolation <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 9.4.2 Over-current protective devices Table 3 \u2013 Number of protected poles with regard to the characteristics of the distribution system <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 9.4.3 Residual Current Devices (RCD) 9.5 Surge protective devices <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 9.6 Earthing arrangement, protective conductors and protective bonding conductors 9.6.1 Earth electrodes <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 9.6.2 Protective bonding conductors 10 Verification 11 Operation and maintenance <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | A.2.2 In TN systems A.2.3 In TT systems <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | A.3 Double or reinforced insulation A.4 Extra-low-voltage (SELV and PELV) A.5 Electrical separation <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | A.6 Additional protection <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Annex B (informative) Types of LV distribution systems earthing B.1 Terms and definitions Figures Figure B.1 \u2013 General outline of the distribution system <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | B.2 Types of system earthing used in DRES (Figures are from IEC\u00a060364-1:2005) B.2.1 General Figure B.2 \u2013 Distribution system of the smallest type <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | B.2.2 AC TN systems <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Figure B.3 \u2013 TN-S system 3-phase, 4-wire with separate neutral conductor and protective conductor throughout the distribution system <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Figure B.4 \u2013 TN-S system 3-phase, 3-wire with separate earthed line conductor and protective conductor throughout the distribution system <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Figure B.5 \u2013 TN-S system 3-phase, 3-wire with protective conductor and no distributed neutral conductor throughout the distribution system <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Figure B.6 \u2013 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 <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Figure B.7 \u2013 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 \u2013 TN-C-S system \u2013 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 <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Figure B.9 \u2013 TN-C system 3-phase, 4-wire with neutral and protective conductor functions combined in a single conductor throughout the distribution system <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | B.2.3 AC TT systems Figure B.10 \u2013 TN-S multiple source system 3-phase, 4-wire with separate protective conductor and neutral conductor to current using equipment <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Figure B.11 \u2013 TT system 3-phase, 4-wire with earthed protective conductor and neutral conductor throughout the distribution system Figure B.12 \u2013 TT system 3-phase, 3-wire with earthed protective conductor and no distributed neutral conductor throughout the distribution system <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | B.2.4 DC distribution systems <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Figure B.13 \u2013 TN-S d.c. system <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Figure B.14 \u2013 TN-C d.c. system <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Figure B.15 \u2013 TN-C-S d.c. system <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Figure B.16 \u2013 TT d.c. system <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Annex C (informative) Classification of electrical equipment C.1 Classification of residual current devices (RCDs) (see IEC\u00a061008, IEC\u00a0 61009, IEC\u00a0 60755, IEC\u00a0 60947-2, IEC\u00a062423) <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | C.2 Classification of circuit breakers for a.c. operation (see IEC 60898-1, IEC\u00a060947-2) <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | C.3 Classification of surge protective devices (see IEC\u00a061643-11) <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Annex D (informative) General information concerning protection against lightning D.1 General Figure D.1 \u2013 Example of effects of a lightning stroke <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | D.2 Protection against lightning \u2013 Principles <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Recommendations for renewable energy and hybrid systems for rural electrification – Protection against electrical hazards<\/b><\/p>\n |