prHD 60364-8-81:2025
(Main)Low-voltage electrical installations - Part 8-81: Functional aspects - Energy efficiency
Low-voltage electrical installations - Part 8-81: Functional aspects - Energy efficiency
Installations électriques à basse tension - Partie 8-81: Aspects fonctionnels - Efficacité énergétique
Nizkonapetostne električne inštalacije - 8-81. del: Funkcionalni vidiki - Energetska učinkovitost
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2025
Nizkonapetostne električne inštalacije - 8-81. del: Funkcionalni vidiki - Energetska
učinkovitost
Low-voltage electrical installations - Part 8-81: Functional aspects - Energy efficiency
Installations électriques à basse tension - Partie 8-81: Aspects fonctionnels - Efficacité
énergétique
Ta slovenski standard je istoveten z: prHD 60364-8-81:2025
ICS:
27.015 Energijska učinkovitost. Energy efficiency. Energy
Ohranjanje energije na conservation in general
splošno
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
64/2743/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60364-8-81 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-02-07 2025-05-02
SUPERSEDES DOCUMENTS:
64/2669/CD, 64/2732/CC
IEC TC 64 : ELECTRICAL INSTALLATIONS AND PROTECTION AGAINST ELECTRIC SHOCK
SECRETARIAT: SECRETARY:
Germany Mr Wolfgang Niedenzu
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 2,SC 22G,TC 23,SC 23E,SC 23K,TC 65,TC 69,TC TC 64 Horizontal Group Energy Efficiency
82,TC 85,TC 120,TC 121,SC 121A,SC 121B,PC 128
ASPECTS CONCERNED:
Energy Efficiency
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which t hey are
aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clau ses
to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC
clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Low-voltage electrical installations - Part 8-81: Functional aspects - Energy efficiency
PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions. You
may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without permis sion
in writing from IEC.
64/2743/CDV 2 IEC 60364-8-81 ED1 © IEC 2025
1 CONTENTS
3 FOREWORD . 5
4 INTRODUCTION . 7
5 81 Energy Efficiency . 8
6 81.1 Scope . 8
7 81.2 Normative references . 8
8 81.3 Terms and definitions. 9
9 81.3.1 General . 9
10 81.3.2 Electrical energy management . 11
11 81.3.3 Energy measurement . 11
12 81.3.4 Sectors of activities . 12
13 81.3.5 Abbreviated terms . 13
14 81.4 General . 13
15 81.4.1 Fundamental principles . 13
16 81.4.2 Energy efficiency assessment for electrical installations . 14
17 81.5 Sectors of activities . 14
18 81.6 Design requirements and recommendations . 15
19 81.6.1 General . 15
20 81.6.2 Determination of load energy profile . 15
21 81.6.3 Determination of the transformer and switchboard location with an
22 optimizing method . 15
23 81.6.4 HV/LV substation . 15
24 81.6.5 Losses in the wiring . 16
25 81.6.6 Efficiency of local production and local storage. 17
26 81.7 Determination of the zones, usages and meshes . 17
27 81.7.1 Determining the zones . 17
28 81.7.2 Determining the usages within the identified zones . 18
29 81.7.3 Demand response . 18
30 81.7.4 Determining the meshes . 19
31 81.7.5 Driving parameters . 21
32 81.7.6 Impacts on the design of an electrical installation . 21
33 81.8 Energy efficiency and load management system . 22
34 81.8.1 General . 22
35 81.8.2 User specification . 22
36 81.8.3 Inputs from loads, sensors and forecasts . 23
37 81.8.4 Inputs from the supplies: energy availability and pricing . 31
38 81.8.5 Monitoring the performance of the electrical installation . 31
39 81.8.6 Management of loads through meshes. 31
40 81.8.7 Multi-supply source management: grid, local electricity production and
41 storage . 32
42 81.9 Maintenance and enhancement of the performance of the installation . 32
43 81.9.1 Methodology . 32
44 81.9.2 Installation life cycle methodology . 34
45 81.9.3 Energy efficiency life cycle . 34
46 81.9.4 Data management . 35
47 81.9.5 Maintenance . 35
48 81.10 Parameters for implementation of efficiency measures . 35
IEC 60364-8-81 ED1 © IEC 2025 3 64/2743/CDV
49 81.10.1 General . 35
50 81.10.2 Efficiency measures . 35
51 81.11 Energy efficiency actions . 40
52 Annex A (informative) Determination of transformer and switchboard location . 42
53 A.1 Barycentre method . 42
54 A.2 Total load barycentre . 45
55 A.2.1 General . 45
56 A.2.2 Sub-distribution board locations . 46
57 A.2.3 Iterative process . 46
58 A.3 Method of average route length . 46
59 A.4 Minimum Energy Moment Method . 49
60 A.4.1 General . 49
61 A.4.2 Calculation of Load Center Coordinates . 49
62 A.4.3 Minimum Total Energy Moment and Minimum Average Load Distance of
63 the System . 50
64 A.4.4 Example . 50
65 A.4.5 Principle Derivation . 51
66 Annex B (normative) Method to assess the energy efficiency of an electrical
67 installation . 54
68 B.1 General . 54
69 B.2 Electrical installation efficiency classes . 54
70 B.3 Determination of the electrical installation efficiency class . 54
71 B.3.1 General . 54
72 B.3.2 Industrial, commercial buildings and infrastructures . 55
73 B.3.3 Residential . 70
74 Annex C (informative) List of notes concerning certain countries . 77
75 Bibliography . 78
77 Figure 1 – Energy efficiency and load management system overview . 22
78 Figure 2 – Electrical distribution scheme . 25
79 Figure 3 – Example of measurement equipment selection in an installation . 28
80 Figure 4 – Iterative process for electrical energy efficiency management . 33
81 Figure A.1 – Example 1: floor plan of production plant with the planned loads and
82 calculated barycentre . 44
83 Figure A.2 – Example 2: barycentre calculated . 45
84 Figure A.3 – Example of location of the barycentre in an industrial building . 46
85 Figure A.4 – Example of location of the barycentre using the average route length
86 method . 48
87 Figure A.5 – Example of location using the minimum Total Energy Moment and
88 Minimum Average Load Distance of the System . 50
89 Figure A.6 – relationship between the system’s total energy moment and the system’s
90 minimum energy moment . 53
91 Figure B.1 – Level of efficiency of the electrical installation efficiency classes . 54
93 Table 1 – Measurement applications . 24
94 Table 2 – Overview of the needs for power metering and monitoring . 25
95 Table 3 – Process for electrical energy efficiency management and responsibilities . 33
64/2743/CDV 4 IEC 60364-8-81 ED1 © IEC 2025
96 Table A.1 – Cable length for supply of DB . 47
97 Table B.1 – Electrical installation efficiency classes . 55
98 Table B.2 – Energy efficiency measures . 56
99 Table B.3 – Determination of energy consumption: coverage . 57
100 Table B.4 – Main substation: consumption . 57
101 Table B.5 – Main substation: location . 58
102 Table B.6 – Method of average route length . 58
103 Table B.7 – Voltage drop .
...
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