IEC TS 62257-9-4:2016(E) specifies the general requirements for the design and the implementation of a user’s installation. It applies to single phase user’s electrical installations with maximum power of 500 VA, in decentralized rural electrification systems. It is applicable to installations supplied by an AC microgrid and to installations encompassing their own single-unit AC micropower plant or DC micropower plant. The main technical changes with regard to the previous edition are as follows: changing the voltage range covered by the technical specification to AC nominal voltage below 1 000 V and DC nominal voltage below 1 500 V. This publication is to be read in conjunction with \/2.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 31<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | 1 Scope 2 Normative reference <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | 4 General considerations 4.1 General 4.2 Installation limits 4.3 User interface 5 Protection against electric shock 5.1 Requirements for d.c. parts of installation 5.2 Requirements for a.c. parts of installation 5.2.1 General 5.2.2 Neutral earthing system Figures Figure 1 \u2013 Installation limits <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Figure 2 \u2013 Protection of persons in an installation supplied from a microgrid according to a TN-C-S system <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | 6 Protection against overcurrent 7 Protection against effect of lightning 7.1 Installation supplied from a microgrid 7.2 Standalone installation Figure 3 \u2013 Protection of persons in a combined d.c. and a.c. system Tables Table 1 \u2013 Maximum design current of circuits depending on voltages <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | 8 Selection and erection of electrical equipment 8.1 Wiring system 8.1.1 General 8.1.2 Voltage drops 8.1.3 Cross-sectional area of conductors Table 2 \u2013 Maximum acceptable voltage drop values in installations <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | 8.1.4 Connections Table 3 \u2013 Cross-sectional area for copper conductors in fixed installations <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | 8.1.5 Installation method Table 4 \u2013 Selection of wiring systems Table 5 \u2013 Installation of wiring systems <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | 8.1.6 Selection and erection of wiring systems in relation to external influences <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | 8.1.7 Specific rules to wiring systems buried in earth <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | 8.1.8 Circuits identification 8.2 Isolation and switching 8.2.1 Overcurrent protective devices 8.2.2 Residual current devices 8.3 Surge protective devices 8.4 Earthing arrangement, protective conductors and protective bonding 8.5 User interface Table 6 \u2013 Fuses\/circuit breakers rating and selection for overcurrent protection <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | 9 Verification 9.1 Pre-commissioning checks 9.1.1 General information 9.1.2 Verification by inspection <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | 9.1.3 Verification by tests 10 Operation and maintenance <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | Annex A (informative) Maximum possible length of circuits with different cables and conductors to handle maximum voltage drops (ambient temperature 30 \u00b0C) <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | Figure A.1 \u2013 Maximum possible length of circuit as a function of current for a voltage drop of 3 % in a.c. system in a cable HO5VVF <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | Figure A.2 \u2013 Maximum possible length of circuit as a function of current for a voltage drop of 15 % in d.c. system in a cable 1000RO2V <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Tracked Changes. Recommendations for renewable energy and hybrid systems for rural electrification – Integrated systems. User installation<\/b><\/p>\n |