IEC TS 61200-102:2020

IEC TS 61200-102 ®
Edition 1.0 2020-03
TECHNICAL
SPECIFICATION
colour
inside
Electrical installation guide –
Part 102: Application guidelines for low-voltage direct current electrical
installations not intended to be connected to a public distribution network
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IEC TS 61200-102 ®
Edition 1.0 2020-03
TECHNICAL
SPECIFICATION
colour
inside
Electrical installation guide –

Part 102: Application guidelines for low-voltage direct current electrical

installations not intended to be connected to a public distribution network

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 91.140.50 ISBN 978-2-8322-8013-3

– 2 – IEC TS 61200-102:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 General . 8
4.1 Concept of electrical installation . 8
4.2 Architecture and operating modes of installation . 9
5 Local power sources (supplies). 9
6 Loads . 9
6.1 Possible nominal voltages . 9
6.2 Minimum and maximum voltage values . 10
7 Wiring systems . 10
7.1 Type of wiring system . 10
7.2 Identification of conductors and terminals . 10
7.3 Cross-sectional areas of conductors . 11
8 Earthing . 11
8.1 Direction of touch current . 11
8.2 Earthing arrangement . 12
8.3 Protective conductors . 12
8.4 Earthing conductors . 12
9 Protection for safety . 12
9.1 Protection against electric shock . 12
9.1.1 General . 12
9.1.2 Provision for basic protection . 12
9.1.3 Provision for fault protection . 12
9.2 Protection against thermal effects . 16
9.2.1 Protection against electric arc . 16
9.2.2 Risk of explosion with batteries. 16
9.3 Protection against overcurrent . 17
9.3.1 Overload protection . 17
9.3.2 Short-circuit protection . 17
9.4 Protection against overvoltage . 18
10 Inspection . 18
10.1 Initial inspection . 18
10.2 Periodic inspection . 18
Annex A (normative)  Architecture and operating modes of installations. 20
A.1 Architecture of installations . 20
A.1.1 Individual installation . 20
A.1.2 Collective installation . 20
A.1.3 Shared installations . 20
A.2 Operating modes . 21
A.2.1 Direct feeding mode. 21
A.2.2 Reverse feeding mode . 21
A.2.3 Autonomous mode . 22
Annex B (informative)  Limitation of lengths of cables . 23

B.1 Limit of voltage drop in consumer installations . 23
B.2 Estimation of voltage drop . 23
Annex C (informative) List of notes concerning certain countries . 24
Bibliography . 25

Figure 1 – Concept of DC low-voltage electrical installation . 9
Figure 2 – Colours used for identification of conductors in DC electrical installations . 11
Figure 3 – Downward and upward direct current in human body . 11
Figure 4 – Example of electrical installation in TN-S system . 13
Figure 5 – Estimation of short-circuit level in TN system . 14
Figure 6 – Examples of TN-S systems in DC installation . 15
Figure 7 – Different types of arc fault to be considered . 16
Figure A.1 – Example of an individual installation . 20
Figure A.2 – Example of a collective installation . 20
Figure A.3 – Example of a shared installation . 21
Figure A.4 – DC electrical installation in direct feeding mode . 21
Figure A.5 – DC electrical installation in reverse feeding mode . 21
Figure A.6 – DC electrical installation in autonomous mode . 22

Table 1 – Preferred nominal DC voltages . 10

– 4 – IEC TS 61200-102:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSTALLATION GUIDE –

Part 102: Application guidelines for low-voltage direct current electrical
installations not intended to be connected to a public distribution network

FOREWORD
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