IEC TS 61200-101:2018

IEC TS 61200-101 ®
Edition 1.0 2018-11
TECHNICAL
SPECIFICATION
colour
inside
Electrical installation guide –
Part 101: Application guidelines on extra-low-voltage direct current electrical
installations not intended to be connected to a public distribution network
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IEC TS 61200-101 ®
Edition 1.0 2018-11
TECHNICAL
SPECIFICATION
colour
inside
Electrical installation guide –

Part 101: Application guidelines on extra-low-voltage direct current electrical

installations not intended to be connected to a public distribution network

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 91.140.50 ISBN 978-2-8322-6254-2

– 2 – IEC TS 61200-101:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Concept of an electrical installation . 8
5 DC supplies . 9
6 Loads . 9
6.1 Preferred 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 . 11
7.3 Cross-sectional areas of conductors . 11
7.4 Selection of conductors . 11
7.4.1 12 V nominal voltage . 11
7.4.2 24 V nominal voltage . 11
7.4.3 36 V nominal voltage . 12
7.4.4 48 V nominal voltage . 12
8 Protection against electric shock . 13
8.1 General . 13
8.2 Provision for basic protection . 13
8.3 Provision for fault protection . 13
8.4 Protection by safety extra-low voltage system (SELV system) . 13
9 Protection against overcurrent . 13
10 Arcing . 14
11 Example of a typical architecture . 14
Annex A (informative) Voltage drop limits for extra-low-voltage installations . 15
A.1 Voltage drop limits in consumers' installations . 15
A.2 Estimation of voltage drop . 15
Annex B (informative) Example of an installation for energy access using the SELV
system as protective measure against electric shock . 16
Bibliography . 17

Figure 1 – Concept of a low voltage electrical installation . 9
Figure 2 – Colour identification of conductors in DC circuits . 11
Figure B.1 – Example of an installation for energy access using SELV system as
protective measure against electric shock . 16

Table 1 – Preferred voltages for equipment . 10
Table 2 – Maximum length with respect to maximum voltage drop (12 V nominal
voltage) . 11
Table 3 – Maximum length with respect to maximum voltage drop (24 V nominal
voltage) . 12

Table 4 – Maximum length with respect to maximum voltage drop (36 V nominal
voltage) . 12
Table 5 – Maximum length with respect to maximum voltage drop (48 V nominal

voltage) . 12
Table A.1 – Maximum voltage drops . 15

– 4 – IEC TS 61200-101:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSTALLATION GUIDE –

Part 101: Application guidelines on extra-low-voltage
direct current electrical installations not intended to be
connected to a public distribution network

FOREWORD
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Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC TS 61200-101, which is a Technical Specification, has been prepared by IEC technical
committee 64: Electrical installations and protection against electric shock.

The text of this Technical Specification is based on the following documents:
Draft TS Report on voting
64/2284/DTS 64/2338/RVDTS
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61200 series, published under the general title Electrical
installation guide, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
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