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

IEC TS 61200-102:2020(E) applies to low-voltage DC electrical installations entirely supplied by local power sources and having a nominal voltage lower or equal to the low-voltage limit. These installations can be connected to collective or shared private electrical installations.
This document also applies to DC installations according to use cases TIER 2 and TIER 3 of the World Bank defined in ESMAP 008/15 report: Beyond Connections Energy Access Redefined

General Information

Status
Published
Publication Date
26-Mar-2020
Current Stage
PPUB - Publication issued
Completion Date
27-Mar-2020
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IEC TS 61200-102:2020 - 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
IEC TS 61200-102:2020-03(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 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

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IEC TS 61200-102:2020 © IEC 2020 – 3 –

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

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– 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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rights. IEC shall not be held responsible for identifying any or all such patent rights.

The main task of IEC technical committees is to prepare International Standards. In exceptional

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• the required support cannot be obtained for the publication of an International Standard,

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future but no immediate possibility of an agreement on an International Standard.

Technical Specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 61200-102, which is a Technical Specification, has been prepared by IEC technical

committee 64: Electrical installations and protection against electric shock.
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IEC TS 61200-102:2020 © IEC 2020 – 5 –
The text of this Technical Specification is based on the following documents:
Draft TS Report on voting
64/2385/DTS 64/2406/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 reader's attention is drawn to the fact that Annex C lists all of the "in-some-country" clauses

on differing practices of a less permanent nature relating to the subject of this document.

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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

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– 6 – IEC TS 61200-102:2020 © IEC 2020
INTRODUCTION

Many people in the world who still have no access to electricity would benefit from access to

electrical power. This can now be achieved with distributed electrical sources using renewable

energy. These electrical sources using renewable energy are all operating in direct current (e.g.

photovoltaic system, wind turbines).

Supply from these renewable energies is not constant, photovoltaic panels do not operate at

night, and wind turbines require wind for generating electrical energy. Therefore, the use of

storage units becomes a necessity and manufacturers of stationary secondary batteries are

investing in these technologies so that they can become affordable.

In addition, lighting with light emitting diodes (LED), mobile phones and other electronic devices

generally operate using direct current.

All requirements and recommendations in this document comply with IEC 60364 (all parts).

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IEC TS 61200-102:2020 © IEC 2020 – 7 –
ELECTRICAL INSTALLATION GUIDE –
Part 102: Application guidelines for low-voltage direct current electrical
installations not intended to be connected to a public distribution network
1 Scope

This part of IEC 61200 applies to low-voltage DC electrical installations entirely supplied by

local power sources and having a nominal voltage lower or equal to the low-voltage limit. These

installations can be connected to collective or shared private electrical installations.

This document also applies to DC installations according to use cases TIER 2 and TIER 3 of

the World Bank defined in ESMAP 008/15 report: Beyond Connections Energy Access
Redefined.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

IEC 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety –

Protection against electric shock

IEC 60364-5-52, Low-voltage electrical installations – Part 5-52: Selection and erection of

electrical equipment – Wiring systems

IEC 60445, Basic and safety principles for man-machine interface, marking and identification –

Identification of equipment terminals, conductor terminations and conductors
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
individual electrical installation
single consuming and/or producing electrical installation
3.2
collective electrical installation

set of consuming electrical installations sharing one common set of local power supplies and

energy storage equipment
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– 8 – IEC TS 61200-102:2020 © IEC 2020
3.3
shared electrical installation

set of consuming and/or producing electrical installations, similar to an individual electrical

installation, and sharing their individual power supplies and energy storage equipment

3.4
autonomous mode

operating mode where the electrical installation operates while disconnected from the public

distribution network
3.5
public distribution network
PDN

set of coordinated equipment intended to be used for the distribution of electrical energy to

private electrical installations and operated by a public organization
3.6
prosumer
entity or party which can be both a producer and a consumer of electrical energy
4 General
4.1 Concept of electrical installation

Any low-voltage electrical installation is to be considered as a set of electrical equipment having

the following functions (see Figure 1):
• supply (e.g. local generator, photovoltaic systems, wind turbine, batteries);
• distribution (e.g. distribution board, wiring systems, socket-outlets);
• consumption (e.g. fans, lighting, appliances, pumps, batteries).

NOTE Rechargeable batteries can be considered as a power supply and as a consuming unit.

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IEC TS 61200-102:2020 © IEC 2020 – 9 –
Figure 1 – Concept of DC low-voltage electrical installation
4.2 Architecture and operating modes of installation

Various architectures and operating modes of installations are defined in Annex A.

Selection of the appropriate installation architectures shall be undertaken according to the

environment of the installation and its foreseeable future modification.
5 Local power sources (supplies)
Examples of local power sources are:
• local rotating generating set;
• storage units;
• photovoltaic system;
• wind turbine.

Any combination of different types of local power sources is possible. Where power sources

use renewable energy, which provides intermittent supply, storage of this energy is

recommended.
6 Loads
6.1 Possible nominal voltages
Table 1 provides recommended DC voltage values for equipment.
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– 10 – IEC TS 61200-102:2020 © IEC 2020
Table 1 – Preferred nominal DC voltages
Preferred
220
350
400
440
700 or ±350
1 400 or ±700
Selection of voltage levels requires consideration of protective measures.

Using only one single nominal DC voltage within the installation might require voltage

adaptation at different levels (e.g. through a DC/DC converter) as all power sources, storage

units and current-using equipment may not operate at the same rated voltage.
6.2 Minimum and maximum voltage values

In case stationary secondary batteries (SSB) are used for supplying the DC electrical

installation as backup power source, voltage level supplied by the batteries may be variable

depending on their charge. This is particularly the case where no voltage regulation is used for

the SSB. Large voltage tolerance for the nominal voltage (U ) of the installation shall be

considered for equipment selection.
Information from the battery/component manufacturer shall be considered.

NOTE If no calculation is possible or no details from the battery/component manufacturer is provided, the following

minimum and maximum values can be used:
– maximum voltage: 1,2 U ;
– minimum voltage: 0,8 U .
7 Wiring systems
7.1 Type of wiring system

Where automatic disconnection of supply is used as protective measure against electric shock,

cables shall include three or four core conductors:
• one conductor for protective earth (PE), and
• one conductor for positive polarity, and
• one conductor for negative polarity, and/or
• one conductor for mid-point.
TN-C systems shall not be used.
7.2 Identification of conductors and terminals

A positive polarity conductor shall be identified by the colour red and a negative polarity

conductor shall be identified by the colour white according to IEC 60445.
A mid-point conductor shall be identified by the colour blue.
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IEC TS 61200-102:2020 © IEC 2020 – 11 –
A PE conductor shall be identified by the bi-colour green and yellow.

If terminals have an identification then the symbols "+", "-", "M" and "PE" shall be used.

Key
a) Planned for future expansion to a bipolar system
Colours according to IEC 60445.
Figure 2 – Colours used for identification
of conductors in DC electrical installations

If wiring with different colours is used, for example in previously installed AC systems, DC circuit

conductors shall be clearly marked as identified in Figure 2.
7.3 Cross-sectional areas of conductors

For circuits up to and including nominal currents I of 16 A, the cross-sectional area of a

conductor shall be a minimum of 1,5 mm Cu. For nominal currents higher than 16 A, a larger

cross-sectional area shall be selected based on the maximum current, the acceptable voltage

drop and environmental conditions, see IEC 60364-5-52.
The same cross-sectional area shall be used for all conductors within a circuit.
8 Earthing
8.1 Direction of touch current

IEC 60479-1 states that the threshold of ventricular fibrillation for a downward current of a

duration of 10 ms or more is about twice as high as for an upward current (see

IEC 60479-1:2018, 6.4). For current pulses shorter than 10 ms there is no known directional

sensitivity difference. See Figure 3.
Figure 3 – Downward and upward direct current in human body
---------------------- Page: 13 ----------------------
– 12 – IEC TS 61200-102:2020 © IEC 2020
In a TN system, connecting the negative polarity to earth is recommended.
8.2 Earthing arrangement

In a TN system, mid-point or one polarity (positive or negative) of DC power supplies shall be

connected to earth at one point only, and exposed-conductive parts shall be connected to this

earthing arrangement.

In an individual installation, the earth connection shall be made on the main earthing busbar or

main earthing terminal, thus ensuring connection of all possible power sources to earth.

8.3 Protective conductors

Each conductor connected to the main earthing terminal shall be able to be disconnected

individually. This connection shall be reliable and such that it can only be disconnected by

means of a tool.
8.4 Earthing conductors

Protective conductors shall be suitably protected against mechanical damage, chemical or

electrochemical deterioration, electrodynamic forces and thermodynamic forces.

Every connection (e.g. screwed connections, clamp connectors) between protective conductors

or between a protective conductor and other equipment shall provide durable electrical

continuity and adequate mechanical strength and protection. Screws for connecting protective

conductors shall not serve any other purpose.
Consideration shall be given to protect against corrosion.
9 Protection for safety
9.1 Protection against electric shock
9.1.1 General

Protection of persons and livestock against electric shock requires that hazardous-live-parts

shall not be accessible and accessible conductive parts shall not be hazardous-live.

This requires that persons and livestock shall not have access to parts normally live (basic

protection) and exposed-conductive parts shall not become hazardous resulting from an

insulation fault (fault protection). Any protective measure against electric shock shall be an

adequate combination of two separate types of protection (basic and fault), or an enhanced

protection, combining both types of protection into one single measure.

In addition, protective measures to be implemented shall consider that unskilled persons having

access to electrical equipment are deemed not to be aware of the dangers of electricity.

9.1.2 Provision for basic protection

Unskilled persons having access to electrical equipment are deemed not to be aware of

dangers of electricity; so basic protection shall be applied.
9.1.3 Provision for fault protection
9.1.3.1 General

Unskilled persons having access to electrical equipment are deemed not to be aware of the

dangers of electricity; so fault protection shall be applied.
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IEC TS 61200-102:2020 © IEC 2020 – 13 –
9.1.3.2 Protective measures
9.1.3.2.1 General

The implementation of the relevant requirements and recommendations given in this document

allow the installation to comply with IEC 60364-4-41.
9.1.3.2.2 Automatic disconnection of supply
9.1.3.2.2.1 TT systems
TT systems are not considered in this document.

The use of TT systems requires additional measures for example corrosion protection and

devices for automatic disconnection of supply.
9.1.3.2.2.2 TN system
9.1.3.2.2.2.1 General

DC electrical installations according to this document shall be designed as a TN-S system (see

Figure 4).
Key
Mid-point conductor (M)
Protective conductor (PE)
NOTE This figure complies with the general requirements of IEC 60364-1.
Figure 4 – Example of electrical installation in TN-S system
9.1.3.2.2.2.2 Use of devices for short-circuit protection

In a TN system, the value of an earth fault current is similar to a short-circuit current. Usually

short-circuit protective devices can be used for protection against electric shock. Consideration

should be given for such cases (e.g. where only photovoltaic systems are used), where the

short-circ
...

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