This part of IEC 62257, which is a technical specification, specifies the general requirements for the design and the implementation of a user’s installation.

This part of IEC 62257 applies to single phase user’s electrical installations with maximum power of 500 VA, in Decentralized Rural Electrification Systems (DRES).

NOTE For installations above 500 VA in decentralized electrification systems, IEC TS 62257-5 applies.

This part of IEC 62257 is applicable to installations supplied by an a.c microgrid (120 V or 220 V or 230 V or 240 V) and to installations encompassing their own single-unit a.c. micropower plant (120 V or 220 V or 230 V or 240 V) or d.c micropower plant (12 V or 24 V).

The part of IEC 62257 applies neither to the electric power production and distribution installations described in the clauses concerning micropower plants and microgrids, nor to user electrical equipment. It details the rules governing the design and construction of consumer’s electrical installations for the purpose of ensuring the safety of persons and property, and satisfactory operation in accordance with the purpose for which the installations are designed.

It applies to new installations and modifications of existing installations.

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PDF Pages	PDF Title
4	CONTENTS
6	FOREWORD
8	INTRODUCTION
9	1 Scope 2 Normative reference
10	3 Terms and definitions
11	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 – Installation limits
12	Figure 2 – Protection of persons in an installation supplied from a microgrid according to a TN-C-S system
13	6 Protection against overcurrent 7 Protection against effect of lightning 7.1 Installation supplied from a microgrid 7.2 Standalone installation Figure 3 – Protection of persons in a combined d.c. and a.c. system Tables Table 1 – Maximum design current of circuits depending on voltages
14	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 – Maximum acceptable voltage drop values in installations
15	8.1.4 Connections Table 3 – Cross-sectional area for copper conductors in fixed installations
16	8.1.5 Installation method Table 4 – Selection of wiring systems Table 5 – Installation of wiring systems
17	8.1.6 Selection and erection of wiring systems in relation to external influences
19	8.1.7 Specific rules to wiring systems buried in earth
20	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 – Fuses/circuit breakers rating and selection for overcurrent protection
21	9 Verification 9.1 Pre-commissioning checks 9.1.1 General information 9.1.2 Verification by inspection
22	9.1.3 Verification by tests 10 Operation and maintenance
23	Annex A (informative) Maximum possible length of circuits with different cables and conductors to handle maximum voltage drops (ambient temperature 30 °C)
24	Figure A.1 – Maximum possible length of circuit as a function of current for a voltage drop of 3 % in a.c. system in a cable HO5VVF
25	Figure A.2 – Maximum possible length of circuit as a function of current for a voltage drop of 15 % in d.c. system in a cable 1000RO2V

Status	Definitive
Pages	28
Publication Date	2016-10-31
ISBN	978 0 580 91982 4
Standard Number	PD IEC/TS 62257-9-4:2016
Title	Recommendations for renewable energy and hybrid systems for rural electrification – Integrated systems. User installation
Identical National Standard Of	IEC TS 62257-9-4:2016
Replaces	DD IEC/TS 62257-9-4:2006
Descriptors	Earthing, Selection, Electrical installations, Electric wiring systems, Electric conductors, Overcurrent protection, Electrical safety, Rural areas, Lightning protection, Fuelless energy sources, Electric power distribution, Electric power stations, Design, Verification, Electrical protection equipment, Energy supply systems (buildings), Rural electric power networks
Publisher	BSI
Committee	GEL/82
ICS Codes	27.180 - Wind turbine energy systems


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