IEC 60364-8-1:2014

IEC 60364-8-1


®


Edition 1.0 2014-10



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE
colour
inside


Low-voltage electrical installations –
Part 8-1: Energy efficiency

Installations électriques basse tension –
Partie 8-1: Efficacité énergétique

IEC 60364-8-1:2014-10(en-fr)

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IEC 60364-8-1



®



Edition 1.0 2014-10







INTERNATIONAL





STANDARD







NORME



INTERNATIONALE
colour

inside










Low-voltage electrical installations –

Part 8-1: Energy efficiency




Installations électriques basse tension –

Partie 8-1: Efficacité énergétique

















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX XA


ICS 13.020.01; 91.140.50 ISBN 978-2-8322-1883-9



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® Registered trademark of the International Electrotechnical Commission
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– 2 – IEC 60364-8-1:2014 © IEC 2014



CONTENTS



FOREWORD . 5

INTRODUCTION . 7

1 Scope . 8


2 Normative references . 8

3 Terms and definitions . 9

3.1 General . 9

3.2 Electrical energy management . 10
3.3 Energy measurement . 11
3.4 Sectors of activities . 12
4 General . 12
4.1 Fundamental principles . 12
4.1.1 Safety of the electrical installation . 12
4.1.2 Availability of electrical energy and user decision . 12
4.1.3 Design requirements and recommendations . 13
5 Sectors of activities . 13
6 Design requirements and recommendations . 13
6.1 General . 13
6.2 Determination of load profile . 13
6.3 Determination of the transformer and switchboard location with the
barycentre method . 13
6.4 HV/LV substation . 14
6.4.1 General . 14
6.4.2 Optimum number of HV/LV substations . 14
6.4.3 Working point of the transformer . 14
6.4.4 Efficiency of the transformer . 14
6.5 Efficiency of local production . 15
6.6 Efficiency of local storage . 15
6.7 Losses in the wiring . 15
6.7.1 Voltage drop . 15
6.7.2 Cross-sectional areas of conductors . 15
6.7.3 Power factor correction . 15
6.7.4 Reduction of the effects of harmonic currents . 15

7 Determination of the zones, usages and meshes . 16
7.1 Determining the zones . 16
7.2 Determining the usages within the identified zones . 16
7.3 Determining the meshes . 16
7.3.1 General . 16
7.3.2 Criteria for considering meshes . 17
7.3.3 Meshes . 18
7.4 Impacts on distribution system design . 18
8 Energy efficiency and load management system . 19
8.1 General . 19
8.2 Requirements from the user . 20
8.2.1 General . 20
8.2.2 Requirements on the loads . 20

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IEC 60364-8-1:2014 © IEC 2014 – 3 –


8.2.3 Requirements on the supplies . 20

8.3 Inputs from loads, sensors and forecasts . 20

8.3.1 Measurement . 20

8.3.2 Loads . 22

8.3.3 Energy sensors . 23

8.3.4 Forecasts . 23

8.3.5 Data logging . 23

8.3.6 Communication . 23

8.4 Inputs from the supplies: energy availability and pricing, smart metering. 23

8.5 Information for the user: monitoring the electrical installation . 23

8.6 Management of loads through the meshes . 24
8.6.1 General . 24
8.6.2 Energy management system . 24
8.7 Multi-supply source management: grid, local electricity production and
storage . 24
9 Maintenance and enhancement of the performance of the installation . 25
9.1 Methodology . 25
9.2 Installation life cycle methodology . 26
9.3 Energy efficiency life cycle . 26
9.3.1 General . 26
9.3.2 Performance programme . 26
9.3.3 Verification . 27
9.3.4 Maintenance . 27
10 Parameters for implementation of efficiency measures . 27
10.1 General . 27
10.2 Efficiency measures . 27
10.2.1 Current-using/carrying equipment . 27
10.2.2 Distribution system . 28
10.2.3 Installation of monitoring systems . 29
11 Actions . 31
12 Assessment process for electrical installations . 32
12.1 New installations, modifications and extensions of existing installations . 32
12.2 Adaptation of existing installations . 32
Annex A (informative) Determination of transformer and switchboard location using the
barycentre method . 33

A.1 Barycentre method . 33
A.2 Total load barycentre . 36
A.2.1 General . 36
A.2.2 Subdistribution board locations . 37
A.2.3 Iterative process . 37
Annex B (informative) Example of a method to assess the energy efficiency of an
electrical installation . 38
B.1 Energy efficiency parameters . 38
B.2 Energy efficiency performance levels . 46
B.3 Installation profiles . 48
B.4 Electrical installation efficiency classes . 49
B.5 Example of installation profile (IP) and electrical installation efficiency class
(EIEC). 50
Bibliography . 52

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Figure 1 – Energy efficiency and load management system . 19


Figure 2 – Power distribution scheme . 21

Figure 3 – Iterative process for electrical energy efficiency management . 25

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

calculated barycentre . 35


Figure A.2 – Barycentre – Example 2: Calculated . 36

Figure A.3 – Example of location of the barycentre in an industrial building . 37



Table 1 – Overview of the needs . 21
Table 2 – Process for electrical energy efficiency management and responsibilities . 26
Table B.1 – Determination of load profile in kWh . 38
Table B.2 – Location of the main substation . 39
Table B.3 – Required optimization analysis for motors . 40
Table B.4 – Required optimization analysis for lighting . 40
Table B.5 – Required optimization analysis for HVAC . 41
Table B.6 – Required optimization analysis for transformers . 41
Table B.7 – Required optimization analysis for wiring system . 42
Table B.8 – Required optimization analysis for power factor correction . 42
Table B.9 – Requirement for power factor (PF) measurement . 43
Table B.10 – Requirement for electrical energy (kWh) and power (kW) measurement . 43
Table B.11 – Requirement for voltage (V) measurement . 44
Table B.12 – Requirement for harmonic and interharmonic measurement . 45
Table B.13 – Requirement for renewable energy . 46
Table B.14 – Minimum requirement for distribution of annual consumption . 47
Table B.15 – Minimum requirement for reducing the reactive power . 47
Table B.16 – Minimum requirement for transformer efficiency . 48
Table B.17 – Energy efficiency measures profile . 49
Table B.18 – Energy efficiency performance profile for an industrial installation . 49
Table B.19 – Electrical installation efficiency classes . 50
Table B.20 – Example of energy efficiency profile – Efficiency measures . 50

Table B.21 – Example of energy efficiency profile – Energy efficiency performance
levels . 51

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IEC 60364-8-1:2014 © IEC 2014 – 5 –


INTERNATIONAL ELECTROTECHNICAL COMMISSION


____________




LOW-VOLTAGE ELECTRICAL INSTALLATIONS –



Part 8-1: 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.
The text of this standard is based on the first edition and the following documents:
FDIS Report on voting
64/1969/FDIS 64/1977/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60364, under the general title Low-voltage electrical installations,
can be found on the IEC website.

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– 6 – IEC 60364-8-1:2014 © IEC 2014



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related to the specific publication. At this date, the publication will be


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IEC 60364-8-1:2014 © IEC 2014 – 7 –


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 therefore takes into account inputs from users, suppliers and

utilities.


The rate of replacement of existing properties is low, between 2 % and 5 % annually,
depending on the state of the local economy. It is therefore important that this standard
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 through major investment or by an incremental method. 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 standard first introduces the different measures to ensure an energy efficient installation
based on kWh saving. It then provides guidance on giving priority to the measures depending
on the return of investment, i.e. the saving of electrical energy costs divided by the amount of
investment.
This standard is intended to provide requirements and recommendations for the electrical part
1
of the energy management system addressed by ISO 50001 [1] .
Account should be taken, if appropriate, of induced works (civil works, compartmentalization)
and the necessity to expect, or not, the modifiability of the installation.
This standard introduces requirements and recommendations to design the adequate
installation in order to give the ability to improve the management of performance of the
installation by the tenant/user or for example the energy manager.
All requirements and recommendations of this part of IEC 60364 enhance the requirements
contained in Parts 1 to 7 of the standard.


_______________
1
Numbers in square brackets refer to the Bibliography.

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– 8 – IEC 60364-8-1:2014 © IEC 2014



LOW-VOLTAGE ELECTRICAL INSTALLATIONS –



Part 8-1: Energy efficiency








1 Scope


This part of IEC 60364 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 requiremen
...