Low-voltage electrical installations - Part 8-1: Functional aspects - Energy efficiency

IEC 60364-8-1:2019 provides additional requirements, measures and recommendations for the design, erection and verification of all types of low-voltage electrical installation including local production and storage of energy for optimizing the overall efficient use of electricity. It introduces requirements and recommendations for the design of an electrical installation within the framework of an energy efficiency management approach in order to get the best permanent functionally equivalent service for the lowest electrical energy consumption and the most acceptable energy availability and economic balance. These requirements and recommendations apply, within the scope of the IEC 60364 series, for new installations and modification of existing installations. This standard is applicable to the electrical installation of a building or system and does not apply to products. The energy efficiency of these products and their operational requirements are covered by the relevant product standards. This standard does not specifically address building automation systems.
This edition includes the following significant technical changes with respect to the previous edition:
a) revision of Annex B;
b) revision of 4.2: Energy efficiency assessment for electrical installations;
c) update of 8.3: Input from loads, sensors and forecasts;
d) introduction of new definitions.
This group energy efficiency publication is primarily intended to be used as an energy efficiency standard for the low voltage electrical installations mentioned in Clause 1, but is also intended to be used by technical committees in the preparation of standards, in accordance with the principles laid down in IEC Guide 119 and IEC Guide 118.
The contents of the corrigendum of May 2019 have been included in this copy.

Installations électriques à basse tension - Partie 8-1: Aspects fonctionnels - Efficacité énergétique

IEC 60364-8-1:2019 fournit des exigences, des mesures et des recommandations supplémentaires pour la conception, la mise en œuvre, le fonctionnement et la vérification de tous types d'installations électriques à basse tension comportant la production locale et le stockage local de l'énergie pour optimiser l'utilisation efficace globale de l'électricité.
Elle présente les exigences, les recommandations et les méthodes applicables à la conception et à l’évaluation de l’efficacité énergétique (EE) d'une installation électrique dans le cadre d'une approche de gestion de l’efficacité énergétique afin d'obtenir la fonctionnalité équivalente au meilleur service permanent pour la consommation d'énergie électrique la plus faible et la disponibilité de l'énergie et l'équilibre économique les plus acceptables.
Ces exigences, recommandations et méthodes s'appliquent, dans les limites du domaine d'application de l'IEC 60364 (toutes les parties), aux installations neuves et à la modification des installations existantes.
Le présent document est applicable à l'installation électrique d'un bâtiment ou d'un système et ne s'applique pas aux produits. L’efficacité énergétique des produits et leurs exigences opérationnelles sont couvertes par les normes de produits concernées.
Lorsqu’une autre norme fournit des exigences spécifiques à un système particulier ou une application d’installation particulière (par exemple, les systèmes de fabrication couverts par l’ISO 20140 (toutes les parties)), ces exigences peuvent remplacer celles du présent document.
Le présent document ne traite pas spécifiquement des systèmes d'automatisation de bâtiments.
La présente publication groupée d’efficacité énergétique est principalement destinée à être utilisée comme une norme d’efficacité énergétique pour les installations électriques à basse tension citées à l’Article 1, mais elle est également destinée à être utilisée par les comités d’études lors de l’élaboration de normes, conformément aux principes fixés dans le Guide IEC 119 et le Guide IEC 118.
Cette deuxième édition annule et remplace la première édition parue en 2014. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) révision de l’Annexe B;
b) révision de 4.2: évaluation de l’efficacité énergétique pour les installations électriques;
c) mise à jour de 8.3: Données d’entrée à partir des charges, des capteurs et des prévisions;
d) introduction de nouvelles définitions.
La présente version bilingue (2021-02) correspond à la version anglaise monolingue publiée en 2019-02.
La version française de cette norme n'a pas été soumise au vote

General Information

Status
Published
Publication Date
05-Feb-2019
Current Stage
PPUB - Publication issued
Completion Date
06-Feb-2019
Ref Project

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IEC 60364-8-1
Edition 2.0 2019-02
INTERNATIONAL
STANDARD
colour
inside
Low-voltage electrical installations –
Part 8-1: Functional aspects – Energy efficiency
IEC 60364-8-1:2019-02(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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IEC 60364-8-1
Edition 2.0 2019-02
INTERNATIONAL
STANDARD
colour
inside
Low-voltage electrical installations –
Part 8-1: Functional aspects – Energy efficiency
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.020.01; 27.015; 91.140.50 ISBN 978-2-8322-6510-9

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 60364-8-1:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 6

INTRODUCTION ..................................................................................................................... 8

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms, definitions and abbreviated terms ...................................................................... 10

3.1 General ................................................................................................................. 10

3.2 Electrical energy management .............................................................................. 11

3.3 Energy measurement ............................................................................................ 12

3.4 Sectors of activities ............................................................................................... 13

3.5 Abbreviated terms ................................................................................................. 13

4 General ......................................................................................................................... 14

4.1 Fundamental principles ......................................................................................... 14

4.1.1 Safety of the electrical installation ................................................................. 14

4.1.2 Availability of electrical energy and user decision .......................................... 14

4.1.3 Design principles ........................................................................................... 14

4.2 Energy efficiency assessment for electrical installations ....................................... 15

4.2.1 General ......................................................................................................... 15

4.2.2 Action plan following an assessment according to Annex B ........................... 15

5 Sectors of activities ....................................................................................................... 15

6 Design requirements and recommendations .................................................................. 15

6.1 General ................................................................................................................. 15

6.2 Determination of load energy profile...................................................................... 16

6.3 Determination of the transformer and switchboard location with the

barycentre method ................................................................................................ 16

6.4 HV/LV substation .................................................................................................. 16

6.4.1 General ......................................................................................................... 16

6.4.2 Optimum number and location of HV/LV substations ...................................... 16

6.4.3 Working point of the transformer .................................................................... 17

6.4.4 Efficiency of the transformer .......................................................................... 17

6.5 Efficiency of local production and local storage ..................................................... 17

6.6 Losses in the wiring .............................................................................................. 17

6.6.1 Voltage drop .................................................................................................. 17

6.6.2 Cross-sectional areas of conductors .............................................................. 17

6.6.3 Power factor correction .................................................................................. 18

6.6.4 Reduction of the effects of harmonic currents ................................................ 18

7 Determination of the zones, usages and meshes ........................................................... 18

7.1 Determining the zones .......................................................................................... 18

7.2 Determining the usages within the identified zones ............................................... 19

7.3 Demand response ................................................................................................. 19

7.4 Determining the meshes ....................................................................................... 19

7.4.1 General ......................................................................................................... 19

7.4.2 Meshes .......................................................................................................... 20

7.4.3 Criteria for considering meshes ..................................................................... 20

7.5 Driving parameters................................................................................................ 21

7.5.1 General ......................................................................................................... 21

7.5.2 Occupancy .................................................................................................... 22

---------------------- Page: 4 ----------------------
IEC 60364-8-1:2019 © IEC 2019 – 3 –

7.5.3 Operating time ............................................................................................... 22

7.5.4 Environmental conditions ............................................................................... 22

7.5.5 Cost of electricity ........................................................................................... 22

7.6 Impacts on the design of an electrical installation ................................................. 22

8 Energy efficiency and load management system ............................................................ 22

8.1 General ................................................................................................................. 22

8.2 User specification ................................................................................................. 23

8.2.1 General ......................................................................................................... 23

8.2.2 Requirements on the loads ............................................................................ 23

8.2.3 Requirements on the supplies ........................................................................ 23

8.3 Inputs from loads, sensors and forecasts .............................................................. 24

8.3.1 General ......................................................................................................... 24

8.3.2 Communication .............................................................................................. 28

8.3.3 Data logging .................................................................................................. 29

8.3.4 Loads ............................................................................................................ 29

8.3.5 Forecasts ...................................................................................................... 31

8.4 Inputs from the supplies: energy availability and pricing ........................................ 31

8.5 Monitoring the performance of the electrical installation ........................................ 31

8.6 Management of loads through meshes .................................................................. 31

8.6.1 General ......................................................................................................... 31

8.6.2 Electrical energy management system (EEMS) .............................................. 31

8.7 Multi-supply source management: grid, local electricity production and

storage ................................................................................................................. 32

9 Maintenance and enhancement of the performance of the installation ........................... 32

9.1 Methodology ......................................................................................................... 32

9.2 Installation life cycle methodology ......................................................................... 34

9.3 Energy efficiency life cycle .................................................................................... 34

9.3.1 General ......................................................................................................... 34

9.3.2 Performance maintenance programme ........................................................... 34

9.3.3 Verification .................................................................................................... 35

9.4 Data management ................................................................................................. 35

9.5 Maintenance ......................................................................................................... 35

10 Parameters for implementation of efficiency measures .................................................. 35

10.1 General ................................................................................................................. 35

10.2 Efficiency measures .............................................................................................. 35

10.2.1 Current-using-equipment ............................................................................... 35

10.2.2 Electrical installation ...................................................................................... 37

10.2.3 Implementation of management systems ....................................................... 38

10.2.4 Local power supply ........................................................................................ 40

11 Energy efficiency actions ............................................................................................... 41

Annex A (informative) Determination of transformer and switchboard location using the

barycentre method ................................................................................................................ 42

A.1 Barycentre method ................................................................................................ 42

A.2 Total load barycentre ............................................................................................ 45

A.2.1 General ......................................................................................................... 45

A.2.2 Sub-distribution board locations ..................................................................... 46

A.2.3 Iterative process ............................................................................................ 46

A.3 Method of average route length............................................................................. 46

---------------------- Page: 5 ----------------------
– 4 – IEC 60364-8-1:2019 © IEC 2019
Annex B (normative) Method to assess the energy efficiency of an electrical

installation ............................................................................................................................ 49

B.1 General ................................................................................................................. 49

B.2 Electrical installation efficiency classes ................................................................. 49

B.3 Determination of the electrical installation efficiency class .................................... 49

B.3.1 General ......................................................................................................... 49

B.3.2 Industrial, commercial buildings and infrastructures ....................................... 50

B.3.3 Residential .................................................................................................... 64

Annex C (informative) List of notes concerning certain countries ......................................... 70

Bibliography .......................................................................................................................... 71

Figure 1 – Energy efficiency and load management system overview ................................... 23

Figure 2 – Electrical distribution scheme ............................................................................... 26

Figure 3 – Example of measurement equipment selection in an installation .......................... 28

Figure 4 – Iterative process for electrical energy efficiency management .............................. 33

Figure A.1 – Example 1: floor plan of production plant with the planned loads and

calculated barycentre ............................................................................................................ 44

Figure A.2 – Example 2: barycentre calculated ..................................................................... 45

Figure A.3 – Example of location of the barycentre in an industrial building .......................... 46

Figure A.4 – Example of location of the barycentre using the average route length

method ................................................................................................................................. 48

Figure B.1 – Level of efficiency of the electrical installation efficiency classes ...................... 49

Table 1 – Measurement applications ..................................................................................... 25

Table 2 – Overview of the needs for power metering and monitoring ..................................... 26

Table 3 – Process for electrical energy efficiency management and responsibilities .............. 33

Table A.1 – Cable length for supply of DB ............................................................................. 47

Table B.1 – Electrical installation efficiency classes .............................................................. 50

Table B.2 – Energy efficiency measures ............................................................................... 51

Table B.3 – Determination of energy consumption: coverage ................................................ 52

Table B.4 – Main substation: consumption ............................................................................ 52

Table B.5 – Main substation: location.................................................................................... 53

Table B.6 – Voltage drop ...................................................................................................... 53

Table B.7 – Efficiency of transformer .................................................................................... 54

Table B.8 – Efficiency of fixed installed current using equipment .......................................... 55

Table B.9 – Zones ................................................................................................................ 55

Table B.10 – Usages ............................................................................................................ 56

Table B.11 – Demand response: coverage ............................................................................ 56

Table B.12 – Demand response: duration ............................................................................. 56

Table B.13 – Meshes ............................................................................................................ 57

Table B.14 – Measurement by usages .................................................................................. 58

Table B.15 – Occupancy coverage ........................................................................................ 58

Table B.16 – Occupancy measurement ................................................................................. 58

Table B.17 – Energy management system (EEMS) ............................................................... 59

Table B.18 – HVAC control ................................................................................................... 59

---------------------- Page: 6 ----------------------
IEC 60364-8-1:2019 © IEC 2019 – 5 –

Table B.19 – Lighting control ................................................................................................ 60

Table B.20 – Performance maintenance process .................................................................. 60

Table B.21 – Frequency of the performance verification process ........................................... 60

Table B.22 – Data management ............................................................................................ 61

Table B.23 – Working point of transformer ............................................................................ 61

Table B.24 – Presence of continuous monitoring for large energy using systems .................. 62

Table B.25 – Power factor ..................................................................................................... 62

Table B.26 – THD ............................................................................................................... 63

Table B.27 – THD ................................................................................................................ 63

Table B.28 – Renewable energy ........................................................................................... 64

Table B.29 – Electrical energy storage .................................................................................. 64

Table B.30 – Energy efficiency measures parameters ........................................................... 65

Table B.31 – Determination of energy consumption .............................................................. 65

Table B.32 – Zones ............................................................................................................... 66

Table B.33 – Demand response coverage ............................................................................. 66

Table B.34 – Meshes ............................................................................................................ 67

Table B.35 – HVAC control ................................................................................................... 67

Table B.36 – Lighting control ................................................................................................ 68

Table B.37 – Measurement by usage .................................................................................... 68

Table B.38 – Renewable energy ........................................................................................... 69

Table B.39 – Electrical energy storage .................................................................................. 69

Table C.1 – Notes concerning certain countries .................................................................... 70

---------------------- Page: 7 ----------------------
– 6 – IEC 60364-8-1:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –
Part 8-1: Functional aspects – Energy efficiency
FOREWORD

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

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

International Standard IEC 60364-8-1 has been prepared by IEC technical committee 64:

Electrical installations and protection against electric shock.

This second edition cancels and replaces the first edition published in 2014. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) revision of Annex B;
b) revision of 4.2: Energy efficiency assessment for electrical installations;
c) update of 8.3: Input from loads, sensors and forecasts;
d) introduction of new definitions.
---------------------- Page: 8 ----------------------
IEC 60364-8-1:2019 © IEC 2019 – 7 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
64/2353/FDIS 64/2360/RVD

Full information on the voting for the approval of this International Standard 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.

It has the status of a group energy efficiency publication in accordance with IEC Guide 118

and IEC Guide 119.

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.

A list of all parts in the IEC 60364 series, published under the general title Low-voltage

electrical installations, 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.
The contents of the corrigendum of May 2019 have been included in this copy.

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

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colour printer.
---------------------- Page: 9 ----------------------
– 8 – IEC 60364-8-1:2019 © IEC 2019
INTRODUCTION

The optimization of electrical energy usage can be facilitated by appropriate design and

installation considerations. An electrical installation can provide the required level of service

and safety for the lowest electrical consumption. This is considered by designers as a general

requirement of their design procedures in order to establish the best use of electrical energy.

In addition to the many parameters taken into account in the design of electrical installations,

more importance is nowadays focused on reducing losses within the system and its use. The

design of the whole installation has therefore to take into account inputs from users, suppliers

and utilities.

It is important that this document covers existing electrical installations in buildings, in

addition to new installations. It is in the refurbishment of existing buildings that significant

overall improvements in energy efficiency can be achieved.

The optimization of the use of electricity is based on energy efficiency management which is

based on the price of electricity, electrical consumption and real-time adaptation. Efficiency is

checked by measurement during the whole life of the electrical installation. This helps identify

opportunities for any improvements and corrections. Improvements and corrections may be

implemented by redesign or equipment replacement. The aim is to provide a design for an

efficient electrical installation which allows an energy management process to suit the user's

needs, and in accordance with an acceptable investment. This document f
...

IEC 60364-8-1
Edition 2.0 2019-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage electrical installations –
Part 8-1: Functional aspects – Energy efficiency
Installations électriques à basse tension –
Partie 8-1: Aspects fonctionnels – Efficacité énergétique
IEC 60364-8-1:2019-02(en-fr)
---------------------- Page: 1 ----------------------
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IEC 60364-8-1
Edition 2.0 2019-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage electrical installations –
Part 8-1: Functional aspects – Energy efficiency
Installations électriques à basse tension –
Partie 8-1: Aspects fonctionnels – Efficacité énergétique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.020.01; 27.015; 91.140.50 ISBN 978-2-8322-9410-9

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 60364-8-1:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 6

INTRODUCTION ..................................................................................................................... 8

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms, definitions and abbreviated terms ...................................................................... 10

3.1 General ................................................................................................................. 10

3.2 Electrical energy management .............................................................................. 11

3.3 Energy measurement ............................................................................................ 12

3.4 Sectors of activities ............................................................................................... 13

3.5 Abbreviated terms ................................................................................................. 13

4 General ......................................................................................................................... 14

4.1 Fundamental principles ......................................................................................... 14

4.1.1 Safety of the electrical installation ................................................................. 14

4.1.2 Availability of electrical energy and user decision .......................................... 14

4.1.3 Design principles ........................................................................................... 14

4.2 Energy efficiency assessment for electrical installations ....................................... 15

4.2.1 General ......................................................................................................... 15

4.2.2 Action plan following an assessment according to Annex B ........................... 15

5 Sectors of activities ....................................................................................................... 15

6 Design requirements and recommendations .................................................................. 15

6.1 General ................................................................................................................. 15

6.2 Determination of load energy profile...................................................................... 16

6.3 Determination of the transformer and switchboard location with the

barycentre method ................................................................................................ 16

6.4 HV/LV substation .................................................................................................. 16

6.4.1 General ......................................................................................................... 16

6.4.2 Optimum number and location of HV/LV substations ...................................... 16

6.4.3 Working point of the transformer .................................................................... 17

6.4.4 Efficiency of the transformer .......................................................................... 17

6.5 Efficiency of local production and local storage ..................................................... 17

6.6 Losses in the wiring .............................................................................................. 17

6.6.1 Voltage drop .................................................................................................. 17

6.6.2 Cross-sectional areas of conductors .............................................................. 17

6.6.3 Power factor correction .................................................................................. 18

6.6.4 Reduction of the effects of harmonic currents ................................................ 18

7 Determination of the zones, usages and meshes ........................................................... 18

7.1 Determining the zones .......................................................................................... 18

7.2 Determining the usages within the identified zones ............................................... 19

7.3 Demand response ................................................................................................. 19

7.4 Determining the meshes ....................................................................................... 19

7.4.1 General ......................................................................................................... 19

7.4.2 Meshes .......................................................................................................... 20

7.4.3 Criteria for considering meshes ..................................................................... 20

7.5 Driving parameters................................................................................................ 21

7.5.1 General ......................................................................................................... 21

7.5.2 Occupancy .................................................................................................... 22

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IEC 60364-8-1:2019 © IEC 2019 – 3 –

7.5.3 Operating time ............................................................................................... 22

7.5.4 Environmental conditions ............................................................................... 22

7.5.5 Cost of electricity ........................................................................................... 22

7.6 Impacts on the design of an electrical installation ................................................. 22

8 Energy efficiency and load management system ............................................................ 22

8.1 General ................................................................................................................. 22

8.2 User specification ................................................................................................. 23

8.2.1 General ......................................................................................................... 23

8.2.2 Requirements on the loads ............................................................................ 23

8.2.3 Requirements on the supplies ........................................................................ 23

8.3 Inputs from loads, sensors and forecasts .............................................................. 24

8.3.1 General ......................................................................................................... 24

8.3.2 Communication .............................................................................................. 28

8.3.3 Data logging .................................................................................................. 29

8.3.4 Loads ............................................................................................................ 29

8.3.5 Forecasts ...................................................................................................... 31

8.4 Inputs from the supplies: energy availability and pricing ........................................ 31

8.5 Monitoring the performance of the electrical installation ........................................ 31

8.6 Management of loads through meshes .................................................................. 31

8.6.1 General ......................................................................................................... 31

8.6.2 Electrical energy management system (EEMS) .............................................. 31

8.7 Multi-supply source management: grid, local electricity production and

storage ................................................................................................................. 32

9 Maintenance and enhancement of the performance of the installation ........................... 32

9.1 Methodology ......................................................................................................... 32

9.2 Installation life cycle methodology ......................................................................... 34

9.3 Energy efficiency life cycle .................................................................................... 34

9.3.1 General ......................................................................................................... 34

9.3.2 Performance maintenance programme ........................................................... 34

9.3.3 Verification .................................................................................................... 35

9.4 Data management ................................................................................................. 35

9.5 Maintenance ......................................................................................................... 35

10 Parameters for implementation of efficiency measures .................................................. 35

10.1 General ................................................................................................................. 35

10.2 Efficiency measures .............................................................................................. 35

10.2.1 Current-using-equipment ............................................................................... 35

10.2.2 Electrical installation ...................................................................................... 37

10.2.3 Implementation of management systems ....................................................... 38

10.2.4 Local power supply ........................................................................................ 40

11 Energy efficiency actions ............................................................................................... 41

Annex A (informative) Determination of transformer and switchboard location using the

barycentre method ................................................................................................................ 42

A.1 Barycentre method ................................................................................................ 42

A.2 Total load barycentre ............................................................................................ 45

A.2.1 General ......................................................................................................... 45

A.2.2 Sub-distribution board locations ..................................................................... 46

A.2.3 Iterative process ............................................................................................ 46

A.3 Method of average route length............................................................................. 46

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– 4 – IEC 60364-8-1:2019 © IEC 2019
Annex B (normative) Method to assess the energy efficiency of an electrical

installation ............................................................................................................................ 49

B.1 General ................................................................................................................. 49

B.2 Electrical installation efficiency classes ................................................................. 49

B.3 Determination of the electrical installation efficiency class .................................... 49

B.3.1 General ......................................................................................................... 49

B.3.2 Industrial, commercial buildings and infrastructures ....................................... 50

B.3.3 Residential .................................................................................................... 64

Annex C (informative) List of notes concerning certain countries ......................................... 70

Bibliography .......................................................................................................................... 71

Figure 1 – Energy efficiency and load management system overview ................................... 23

Figure 2 – Electrical distribution scheme ............................................................................... 26

Figure 3 – Example of measurement equipment selection in an installation .......................... 28

Figure 4 – Iterative process for electrical energy efficiency management .............................. 33

Figure A.1 – Example 1: floor plan of production plant with the planned loads and

calculated barycentre ............................................................................................................ 44

Figure A.2 – Example 2: barycentre calculated ..................................................................... 45

Figure A.3 – Example of location of the barycentre in an industrial building .......................... 46

Figure A.4 – Example of location of the barycentre using the average route length

method ................................................................................................................................. 48

Figure B.1 – Level of efficiency of the electrical installation efficiency classes ...................... 49

Table 1 – Measurement applications ..................................................................................... 25

Table 2 – Overview of the needs for power metering and monitoring ..................................... 26

Table 3 – Process for electrical energy efficiency management and responsibilities .............. 33

Table A.1 – Cable length for supply of DB ............................................................................. 47

Table B.1 – Electrical installation efficiency classes .............................................................. 50

Table B.2 – Energy efficiency measures ............................................................................... 51

Table B.3 – Determination of energy consumption: coverage ................................................ 52

Table B.4 – Main substation: consumption ............................................................................ 52

Table B.5 – Main substation: location.................................................................................... 53

Table B.6 – Voltage drop ...................................................................................................... 53

Table B.7 – Efficiency of transformer .................................................................................... 54

Table B.8 – Efficiency of fixed installed current using equipment .......................................... 55

Table B.9 – Zones ................................................................................................................ 55

Table B.10 – Usages ............................................................................................................ 56

Table B.11 – Demand response: coverage ............................................................................ 56

Table B.12 – Demand response: duration ............................................................................. 56

Table B.13 – Meshes ............................................................................................................ 57

Table B.14 – Measurement by usages .................................................................................. 58

Table B.15 – Occupancy coverage ........................................................................................ 58

Table B.16 – Occupancy measurement ................................................................................. 58

Table B.17 – Energy management system (EEMS) ............................................................... 59

Table B.18 – HVAC control ................................................................................................... 59

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IEC 60364-8-1:2019 © IEC 2019 – 5 –

Table B.19 – Lighting control ................................................................................................ 60

Table B.20 – Performance maintenance process .................................................................. 60

Table B.21 – Frequency of the performance verification process ........................................... 60

Table B.22 – Data management ............................................................................................ 61

Table B.23 – Working point of transformer ............................................................................ 61

Table B.24 – Presence of continuous monitoring for large energy using systems .................. 62

Table B.25 – Power factor ..................................................................................................... 62

Table B.26 – THD ............................................................................................................... 63

Table B.27 – THD ................................................................................................................ 63

Table B.28 – Renewable energy ........................................................................................... 64

Table B.29 – Electrical energy storage .................................................................................. 64

Table B.30 – Energy efficiency measures parameters ........................................................... 65

Table B.31 – Determination of energy consumption .............................................................. 65

Table B.32 – Zones ............................................................................................................... 66

Table B.33 – Demand response coverage ............................................................................. 66

Table B.34 – Meshes ............................................................................................................ 67

Table B.35 – HVAC control ................................................................................................... 67

Table B.36 – Lighting control ................................................................................................ 68

Table B.37 – Measurement by usage .................................................................................... 68

Table B.38 – Renewable energy ........................................................................................... 69

Table B.39 – Electrical energy storage .................................................................................. 69

Table C.1 – Notes concerning certain countries .................................................................... 70

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– 6 – IEC 60364-8-1:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –
Part 8-1: Functional aspects – Energy efficiency
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 in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC

Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

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

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

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.

International Standard IEC 60364-8-1 has been prepared by IEC technical committee 64:

Electrical installations and protection against electric shock.

This second edition cancels and replaces the first edition published in 2014. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) revision of Annex B;
b) revision of 4.2: Energy efficiency assessment for electrical installations;
c) update of 8.3: Input from loads, sensors and forecasts;
d) introduction of new definitions.
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IEC 60364-8-1:2019 © IEC 2019 – 7 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
64/2353/FDIS 64/2360/RVD

Full information on the voting for the approval of this International Standard 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.

It has the status of a group energy efficiency publication in accordance with IEC Guide 118

and IEC Guide 119.
The reader's attention is drawn to the fact that Annex C lists all of the "in-
...

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