Specifications for SELV DC systems conforming to the ESMAP multi-tier framework tier 2 and tier 3 requirements for household electricity supply

IEC 63318:2022 This document specifies electrical systems that are intended to be used for electricity access and not connected to a public network such as product kits up to 35 V DC as specified in IEC 62257-9-5 and IEC 62257-9-8 for Tier 2 of the ESMAP Muti-Tier Framework for household electricity supply; and/or 48 V DC fixed installations, for Tier 3 of the ESMAP Muti-Tier Framework for household electricity supply. This document applies to Tier 2 and Tier 3 installations using SELV DC systems.

Spécifications applicables aux schémas TBTS en courant continu conformes aux exigences de niveau 2 et de niveau 3 du cadre multiniveaux de l'ESMAP pour l'alimentation en électricité domestique

IEC 63318:2022 Le présent document spécifie les systèmes électriques destinés à être utilisés pour l'accès à l'électricité et non raccordés à un réseau public tels que les kits de produits jusqu'à 35 V en courant continu spécifiés dans l'IEC 62257-9-5 et l'IEC 62257-9-8 pour le Niveau 2 du cadre multiniveaux de l'ESMAP pour l'alimentation en électricité domestique, et/ou les installations fixes de 48 V en courant continu pour le Niveau 3 du cadre multiniveaux de l'ESMAP pour l'alimentation en électricité domestique. Le présent document s'applique aux installations de niveau 2 et de niveau 3 qui utilisent des schémas TBTS en courant continu.

General Information

Status
Published
Publication Date
16-Jun-2022
Current Stage
PPUB - Publication issued
Completion Date
17-Jun-2022
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IEC 63318
Edition 1.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Specifications for SELV DC systems conforming to the ESMAP multi-tier
framework tier 2 and tier 3 requirements for household electricity supply
Spécifications applicables aux schémas TBTS en courant continu conformes
aux exigences de niveau 2 et de niveau 3 du cadre multiniveaux de L'ESMAP
pour l'alimentation en électricité domestique
IEC 63318:2022-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63318
Edition 1.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Specifications for SELV DC systems conforming to the ESMAP multi-tier
framework tier 2 and tier 3 requirements for household electricity supply
Spécifications applicables aux schémas TBTS en courant continu conformes
aux exigences de niveau 2 et de niveau 3 du cadre multiniveaux de L'ESMAP
pour l'alimentation en électricité domestique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 91.140.50 ISBN 978-2-8322-3926-1

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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 63318:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 Status and objectives ...................................................................................................... 9

5 Typical use cases and system architectures .................................................................... 9

5.1 General ................................................................................................................... 9

5.2 Typical use cases ................................................................................................. 10

5.2.1 Kit (Tier 2) ..................................................................................................... 10

5.2.2 House (Tier 3) ............................................................................................... 10

5.2.3 Shared installations (Tier 3) ........................................................................... 11

6 Supply ........................................................................................................................... 11

7 PV panels ...................................................................................................................... 11

7.1 General ................................................................................................................. 11

7.2 PV panel capacity ................................................................................................. 11

8 Battery........................................................................................................................... 11

8.1 General ................................................................................................................. 11

8.2 Battery capacity .................................................................................................... 12

8.3 Battery safety ........................................................................................................ 12

8.4 Battery compartment ............................................................................................. 12

9 Load converter .............................................................................................................. 12

10 Electrical devices – Disconnection of supply .................................................................. 13

11 Wiring ............................................................................................................................ 13

12 Connectors and socket-outlets ....................................................................................... 14

12.1 General ................................................................................................................. 14

12.2 Secondary interface connectors ............................................................................ 14

12.3 Socket-outlets ....................................................................................................... 14

13 Fixed installation ........................................................................................................... 14

13.1 General ................................................................................................................. 14

13.2 Circuits of the installation ...................................................................................... 14

13.3 Safety measures ................................................................................................... 14

13.4 Protection against over-current ............................................................................. 14

14 Loads ............................................................................................................................ 15

14.1 Fixed loads ........................................................................................................... 15

14.2 Mobile loads ......................................................................................................... 15

Bibliography .......................................................................................................................... 16

Figure 1 – Example of the architecture of a circuit of the DC system that can address

the requirements for Tier 3 of the Multi-Tier Framework ......................................................... 10

Figure 2 – Block diagram of a kit ........................................................................................... 10

Figure 3 – Colour codes for conductors ................................................................................. 13

Table 1 – Table 1 –Attributes of access related to electricity energy supply for

households as given in the Multi-Tier framework ..................................................................... 9

---------------------- Page: 4 ----------------------
IEC 63318:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SPECIFICATIONS FOR SELV DC SYSTEMS CONFORMING TO
THE ESMAP MULTI-TIER FRAMEWORK TIER 2 AND TIER 3
REQUIREMENTS FOR HOUSEHOLD ELECTRICITY SUPPLY
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

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6) All users should ensure that they have the latest edition of this publication.

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

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

IEC 63318 has been prepared by IEC systems committee LVDC: Low voltage direct current and

low voltage direct current for electricity access. It is an International Standard.

The text of this International Standard is based on the following documents:
Draft Report on voting
SyCLVDC/104/CDV SyCLVDC/118/RVC

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.
---------------------- Page: 5 ----------------------
– 4 – IEC 63318:2022 © IEC 2022

"ESMAP" and the "Energy Sector Management Assistance Program" are proprietary names of

the World Bank, which has neither endorsed nor sponsored IEC 63318. These proprietary

names are provided for reasons of public interest or public safety. This information is given for

the convenience of users of this document and does not constitute an endorsement by IEC.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under 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 document 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.

---------------------- Page: 6 ----------------------
IEC 63318:2022 © IEC 2022 – 5 –
INTRODUCTION
0.1 Electricity access initiatives

Access to electricity still remains a major challenge for a significant percentage of the human

population. It is a key enabler of socio-economic development. United Nations' (UN)

Sustainable Development Goal 7 attempts to "Ensure access to affordable, sustainable, reliable

and modern energy for all" and a time-bound target for delivery is specifically stated in Target

7.1 which declares that "By 2030, ensure universal access to affordable, reliable and modern

energy services".

The UN also recognises that access to energy is not just limited to an electricity supply

connection, but rather the usability is indispensable and has mandated that such usability of

the energy supply supporting energy access needs to have several technology-neutral

attributes: it needs to be adequate in quantity, available when needed, of good quality, reliable,

convenient, affordable, legal, healthy, and safe. In addition, the SE4ALL initiative under the UN

delivering the SDG-7 goals has established a Multi-Tier framework which includes these

attributes not just for quantifying access but also providing a basis for scaling electricity

availability.

In addition, Target 7.2 declares that "By 2030, increase substantially the share of renewable

energy in the global energy mix" and Target 7.3 states that "By 2030, double the global rate of

improvement in energy efficiency". It is therefore obvious that technology is going to be the

main driver for delivery of Target 7.2 and 7.3. While the Multi-Tier Framework attempts to be

technology-agnostic, the delivery of the afore-mentioned targets ensures that technology

cannot be ignored.
0.2 Motivation

The IEC is an advocate of safe electricity supply and has helped to ensure affordable and

sustainable electricity supply through its multiple standards. Standards ensure delivery of an

electrical eco-system that is well understood in the marketplace, provides acceptable level of

service and availability, ensures sustainability and at the same time enables affordability

through competing products in the market place and economies of scale.

Standards are applied in many countries throughout the world. IEC International Standards are

used routinely in legislation and regulation and are used to support public policy initiatives.

0.3 IEC's role and philosophy

Considering IEC's role as a standards developer with experts in standards and technology, it is

imperative that IEC present a framework for electricity access which will provide a set of minimal

requirements that ensure that all the attributes associated with electricity supply are addressed.

This will help in adoption of solutions that are affordable, scalable and sustainable besides

providing support for legislation and regulation. It is hoped that this will also help with

investments in this sector to enable delivery of the targets faster than envisioned.

From a standards perspective, the technical committees of IEC are responsible for preparing

the required standards. However, a broader solution such as the delivery of energy access

based on the Multi-Tier framework is beyond the scope of a single committee within IEC and

needs a systems committee to work with technical committees and create a Systems Reference

Deliverable which will draw upon the standards of multiple technical committees and call out

those particular aspects of a standard that are relevant to a related use case. The resulting

document will reflect the accumulated expertise of all the relevant technical committees but

restricted to specific use cases. This will help in identifying gaps and creating standards

enabling delivery and future amendments easier and faster.
---------------------- Page: 7 ----------------------
– 6 – IEC 63318:2022 © IEC 2022

This document is framed in such a manner to include renewable energy and enable higher

energy efficiency by adopting a purely DC-based approach rather than conventional AC-based

approaches for power delivery and therefore this document will also address Target 2 and

Target 3 of SDG-7 goals. With the use of distributed energy sources such as photovoltaics and

wind, DC power is naturally made available and loads are increasingly DC based (e.g. LED

lamps and TVs). Further, storage using batteries is also inherently DC. Enabling the

interconnection of DC sources, storage and loads driven with DC power using a purely DC-

based system is a natural and efficient alternative to conventional AC-based approaches. A

pure DC-based approach can be deployed much faster, is scalable and can be easily integrated

into the utility grid infrastructure when it eventually becomes available.

IEC is constantly developing standards that respond to market needs. This document collates

all the relevant standards from IEC technical committees and subcommittees in a coherent

manner. This document provides international funding agencies with a reference International

Standard, which is a critical need for developing economies struggling with electricity access.

---------------------- Page: 8 ----------------------
IEC 63318:2022 © IEC 2022 – 7 –
SPECIFICATIONS FOR SELV DC SYSTEMS CONFORMING TO
THE ESMAP MULTI-TIER FRAMEWORK TIER 2 AND TIER 3
REQUIREMENTS FOR HOUSEHOLD ELECTRICITY SUPPLY
1 Scope

This document specifies electrical systems that are intended to be used for electricity access

and not connected to a public network such as product kits up to 35 V DC as specified in

IEC 62257-9-5 and IEC 62257-9-8 for Tier 2 of the ESMAP Muti-Tier Framework for household

electricity supply; and/or 48 V DC fixed installations, for Tier 3 of the ESMAP Muti-Tier

Framework for household electricity supply.
This document applies to Tier 2 and Tier 3 installations using SELV DC systems.
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 (all parts), Low-voltage electrical installations

IEC 60364-4-43, Low-voltage electrical installations – Part 4-43: Protection for safety – Protection

against overcurrent

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

Identification of equipment terminals, conductor terminations and conductors

IEC 60884-2-4, Plugs and socket-outlets for household and similar purposes – Part 2-4:

Particular requirements for plugs and socket-outlets for SELV

IEC 60906-3, IEC System of plugs and socket-outlets for household and similar purposes –

Part 3: SELV plugs and socket-outlets, 16 A 6 V, 12 V, 24 V, 48 V, a.c. and d.c.

IEC 61056-1, General purpose lead-acid batteries (valve-regulated types) – Part 1: General

requirements, functional characteristics – Methods of test

IEC TS 61200-101, 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

IEC 61215 (all parts), Terrestrial photovoltaic (PV) modules – Design qualification and type

approval

IEC 61427-1, Secondary cells and batteries for renewable energy storage – General

requirements and methods of test – Part 1: Photovoltaic off-grid application

IEC 61951-2, Secondary cells and batteries containing alkaline or other non acid electrolytes –

Secondary sealed cells and batteries for portable applications – Part 2: Nickel-metal hydride

---------------------- Page: 9 ----------------------
– 8 – IEC 63318:2022 © IEC 2022

IEC 61960-3, Secondary cells and batteries containing alkaline or other non-acid electrolytes –

Secondary lithium cells and batteries for portable applications – Part 3: Prismatic and cylindrical

lithium secondary cells and batteries made from them

IEC TS 62257-9-5, Recommendations for renewable energy and hybrid systems for rural

electrification – Part 9-5: Integrated systems – Laboratory evaluation of stand-alone renewable

energy products for rural electrification

IEC TS 62257-9-8, Renewable energy and hybrid systems for rural electrification – Part 9-8:

Integrated systems – Requirements for stand-alone renewable energy products with power

ratings less than or equal to 350 W
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 https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
rated voltage

rated value of the voltage assigned by the manufacturer to a component, device or equipment

and to which operation and performance characteristics are referred

Note 1 to entry: Equipment may have more than one rated voltage value or may have a rated voltage range.

[SOURCE: IEC 60050-442:2014, 442-09-10, modified – Note 2 to entry has been deleted.]

3.2
enclosure

housing affording the type and degree of protection suitable for the intended application

[SOURCE: IEC 60050-151:2001, 151-13-08]
3.3
extra-low voltage
ELV

voltage not exceeding the relevant voltage limit of band I specified in IEC 61140 but not

exceeding 60 V DC

[SOURCE: IEC 60050-826:2004, 826-12-30, modified – The words "IEC 60449" have been

replaced with "IEC 61140 but not exceeding 60 V DC".]
3.4
kit
series of components needed to make a set that performs a defined function
3.5
SELV system

electric system in which the voltage cannot exceed the value of extra-low voltage:

– under normal conditions and

– under single-fault conditions, including earth faults in other electric circuits

---------------------- Page: 10 ----------------------
IEC 63318:2022 © IEC 2022 – 9 –
Note 1 to entry: SELV is the abbreviation for safety extra-low voltage.
[SOURCE: IEC 60050-195:2021, 195-06-28]
4 Status and objectives

The content of this document is dedicated to Tier 2 and Tier 3 use cases of ESMAP Multi-Tier

Framework. Statements and requirements are based on technology known at the date of its

development.
The generic requirements for ESMAP tiers and attributes are shown in Table 1.

Table 1 – Attributes of access related to electricity energy supply for households as

given in the Multi-Tier framework
Attribute Tier 2 Tier 3

Power capacity ratings (W or daily Minimum peak power delivery of Minimum peak power delivery of

Wh ) 50 W 200 W
Minimum energy delivery of Minimum energy delivery of
200 Wh per day 1 000 Wh per day

Availability (duration) Minimum 4 h per day; minimum 2 h Minimum 8 h per day; minimum 3 h

in the evening in the evening
Reliability No stated requirement No stated requirement
Quality IEC Standards on EMC shall be IEC Standards on EMC shall be
applied applied
Cost of standard consumption
Affordability No stated requirement
package of 365 kWh per year
should be less than 5 % of
household income
Legality No stated requirement No stated requirement
Health and Safety No stated requirement No stated requirement
5 Typical use cases and system architectures
5.1 General

The system has distributed energy source(s) using a PV panel and/or battery for storage. The

power conversion sub-system is designed such that the voltage levels at each of the interfaces

to the PV panel, storage and the delivery interfaces, are operated at the correct voltages.

Figure 1 shows example of the architecture of a circuit of the DC system that can address the

requirements for Tier 3 of the Multi-Tier Framework.
---------------------- Page: 11 ----------------------
– 10 – IEC 63318:2022 © IEC 2022

Figure 1 – Example of the architecture of a circuit of the DC system that can address

the requirements for Tier 3 of the Multi-Tier Framework
5.2 Typical use cases
5.2.1 Kit (Tier 2)

All the different blocks are typically packaged together and supplied as a single unit. The power

control, conversion and storage are typically assembled in a single enclosure and loads are

supplied through connectors, flexible cables or socket-outlets. In some cases, the loads can be

integral to the enclosure or can be mounted directly on the enclosure (see Figure 2).

Figure 2 – Block diagram of a kit
5.2.2 House (Tier 3)

For a house, a distribution system is required as the loads are distributed across multiple rooms.

Power conversion can be required to supp
...

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