oSIST prHD 60364-7-751:2025

Installations électriques à basse tension - Partie 7-751: Exigences pour les installations et emplacements spéciaux - Groupes générateurs à basse tension

Nizkonapetostne električne inštalacije - 7-751. del: Zahteve za posebne inštalacije ali lokacije - Nizkonapetostni generatorji

General Information

• Status: Not Published
• Public Enquiry End Date: 29-Jun-2025
• ICS: 29.160.20 - Generators
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: ELI - Electrical and communication installations
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 17-Apr-2025
• Due Date: 04-Sep-2025
• Completion Date: 30-Jun-2025
• Ref Project: prHD 60364-7-751:2025 - Low-voltage electrical installations - Part 7-751: Requirements for special installations or locations - Low voltage generating sets

Overview

oSIST prHD 60364-7-751:2025 specifies requirements for low-voltage electrical installations that include or allow for the connection of low voltage generating sets. Developed by SIST and identical to prHD 60364-7-751:2025, this standard addresses the particular considerations for integrating generating sets-such as generators and battery-based systems-into special installations or locations. The standard aims to ensure safe operation, effective protection, and proper installation of low voltage generating sets used as main, alternative, or supplementary power sources, supporting the safety and continuity of electricity supply.

Key Topics

• Scope and Applicability
  • Applies to electrical installations containing, or with provisions to connect, one or more low voltage generating sets
  • Includes installations powered by batteries (charging requirements not covered)
• System Arrangement and Earthing
  • Requirements for conductor arrangements and types of system earthing (e.g., TN systems, local earthing)
• Connection and Operation Modes
  • Rules for stand-alone generating sets and those operating in parallel or as switched alternatives to distribution networks
  • Means to prevent unintended parallel operation when not permitted
• Protection and Safety
  • Protection against electric shock, overcurrent, short-circuit, and earth faults
  • Mandatory use of devices such as Residual Current Devices (RCDs) and overcurrent protective devices near generator terminals
• Switching, Control, and Monitoring
  • Specifications for functional switching between multiple power sources, including interlocks and transfer switching equipment
  • Requirements for the selection and erection of protective devices, including unidirectional and bidirectional devices
• Additional Measures
  • Guidance for installations operating in environments where reliable earthing is challenging
  • Enhanced protection methods, such as insulation monitoring devices (IMDs) and dedicated RCDs

Applications

Low-voltage generating sets are increasingly integrated into a variety of sectors for both primary and backup power. This standard supports the safe and effective deployment of such sets in:

• Commercial and Industrial Facilities
  • Ensures compliance during installation of auxiliary generators for backup power in offices, data centers, and factories.
• Residential and Small Businesses
  • Facilitates safe use of generators during outages or for off-grid properties.
• Critical Infrastructure
  • Provides requirements for hospitals, emergency services, and public facilities relying on uninterrupted power.
• Renewable Energy and Hybrid Systems
  • Applies to systems where generating sets supplement grid power or work in isolated (island) mode, including off-grid solar or wind installations.

Installers, manufacturers, and operators benefit from standardized requirements, improving interoperability, operational safety, and regulatory compliance across Europe and internationally. The document also references region-specific requirements, making it adaptable for national legislation and energy supply regulations.

Related Standards

Adhering to oSIST prHD 60364-7-751:2025 furthers compliance with a network of relevant international and European standards governing electrical safety and power system integration:

• IEC 60364 Series – Fundamental standards for low-voltage electrical installation safety and performance
• IEC TS 62786-1 – Requirements for grid-connected power generation systems
• IEC 61557-8 – For insulation monitoring devices in electrical installations
• IEC 60947-6-1 / IEC 62991 – Transfer and source switching equipment for low voltage installations
• IEC 61535, IEC 60320, IEC 60309-2 – Standardized installation couplers and connectors

Additionally, local application may require compliance with country-specific codes such as BS 7671 (UK), national energy authority directives, and utility operator regulations. This standard cross-references these obligations, supporting consistent implementation and global best practices for integrating low voltage generating sets.

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Keywords: low-voltage electrical installations, generating sets, backup power, IEC 60364, electrical safety, system earthing, switchgear, RCD, overcurrent protection, parallel operation, conformity, standardization, energy supply systems, international electrical standards

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2025
Nizkonapetostne električne inštalacije - 7-751. del: Zahteve za posebne inštalacije
ali lokacije - Nizkonapetostni generatorji
Low-voltage electrical installations - Part 7-751: Requirements for special installations or
locations - Low voltage generating sets
Installations électriques à basse tension - Partie 7-751: Exigences pour les installations
et emplacements spéciaux - Groupes générateurs à basse tension
Ta slovenski standard je istoveten z: prHD 60364-7-751:2025
ICS:
29.160.20 Generatorji Generators
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.

64/2749/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60364-7-751 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-04-11 2025-07-04
SUPERSEDES DOCUMENTS:
64/2671/CD, 64/2730/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):
SC 8B,TC 22,SC 22G,SC 23B,SC 23E,SC 23H,SC
23K,SC 32B,SC 37A,TC 69,TC 82,SC 121A,SC
121B,PC 128
ASPECTS CONCERNED:
Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
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for Vote (CDV) is submitted for parallel voting.
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This document is still under study and subject to change. It should not be used for reference purposes.
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clauses 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 7-751: Requirements for special installations or locations -
Low voltage generating sets
PROPOSED STABILITY DATE: 2029
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.
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64/2749/CDV 2 IEC 60364-7-751 ED1 © IEC 2025
1 CONTENTS
3 FOREWORD . 3
4 INTRODUCTION . 5
5 751 LOW VOLTAGE GENERATING SETS . 6
6 751.1 Scope . 6
7 751.13 Fundamental principles . 6
8 751.131 Protection for safety . 6
9 751.131.1 General . 6
10 751.2 Normative references . 6
11 751.3 Terms and definitions. 6
12 751.31 Purposes, supplies and structure . 7
13 751.312 Conductor arrangement and system earthing . 7
14 751.312.2 Types of system earthing . 7
15 751.313 Supplies . 7
16 751.313.1 General . 7
17 751.4 Protection for safety . 7
18 751.41 Protection against electric shock . 7
19 751.410 Introduction . 7
20 751.410.3 General requirements . 7
21 751.5 Selection and erection of electrical equipment . 7
22 751.51 Common Rules . 7
23 751.512 Operational conditions and external influences . 7
24 751.53 Devices for protection for safety, isolation, switching, control and monitoring . 8
25 751.530 Can’t number the next clause without this ‘ghost’ clause? . 8
26 751.530.1 Scope . 8
27 751.531 Equipment for protection against electric shock . 8
28 751.531.2 Devices for automatic disconnection of supply . 8
29 Replace the first paragraph with the following: . 8
30 Where an RCD is used: . 8
31 751.533 Devices for protection against overcurrent . 8
32 751.533.101 Where overcurrent protection of the circuit connecting the
33 generating set to the installation is required, the overcurrent protective
34 device shall be located as near as practicable to the terminals of the
35 generating set. . 8
36 The wiring system between the terminals of the generating sets and the
37 overcurrent protective device shall be inherently short-circuit and earth-
38 fault proof. . 8
39 751.536 Isolation and switching . 8
40 751.536.5 Functional switching (control) . 8
41 751.55 Other equipment . 9
42 751.550 Introduction . 9
43 751.550.101 Installations where a generating set is intended to operate
44 as an additional source of supply in parallel with another source . 9
45 Annex B (informative) List of notes concerning certain countries . 10
46 Annex X (normative) Protective measure: enhanced protection under certain
47 conditions . 16
IEC 60364-7-751 ED1 © IEC 2025 3 64/2749/CDV
50 INTERNATIONAL ELECTROTECHNICAL COMMISSION
51 ____________
53 LOW VOLTAGE ELECTRICAL INSTALLATIONS –
55 PART 7-751: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR
56 LOCATIONS – LOW VOLTAGE GENERATING SETS
59 FOREWORD
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64/2749/CDV 4 IEC 60364-7-751 ED1 © IEC 2025
106 a) .;
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IEC 60364-7-751 ED1 © IEC 2025 5 64/2749/CDV
128 INTRODUCTION
129 The introduction is an optional/conditional element of the text.
130 For rules on the drafting of the introduction, refer to the ISO/IEC Directives, Part 2:2021,
131 Clause 13.
64/2749/CDV 6 IEC 60364-7-751 ED1 © IEC 2025
134 LOW VOLTAGE ELECTRICAL INSTALLATIONS –
136 PART 7-751: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR
137 LOCATIONS – LOW VOLTAGE GENERATING SETS
140 751 LOW VOLTAGE GENERATING SETS (had to add this to get the numbering started)
141 751.1 Scope
142 This part of IEC 60364 applies to electrical installations containing, or having the provision for
143 connection of, one or more low voltage generating sets.
144 This part covers the supply of an installation from a battery but does not cover the charging of
145 the battery.
146 751.13 Fundamental principles
147 751.131 Protection for safety
148 751.131.1 General
149 751.131.1.1 Generating sets shall be installed so that any provisions for safety within the
150 installation are effective for every intended combination of sources of supply.
151 751.2 Normative references
152 The following documents are referred to in the text in such a way that some or all of their content
153 constitutes requirements of this document. For dated references, only the edition cited applies.
154 For undated references, the latest edition of the referenced document (including any
155 amendments) applies.
156 751.3 Terms and definitions
157 For the purposes of this document, the following terms and definitions apply.
158 ISO and IEC maintain terminology databases for use in standardization at the following
159 addresses:
160 • IEC Electropedia: available at https://www.electropedia.org/
161 • ISO Online browsing platform: available at https://www.iso.org/obp
162 751.3.1
163 generating set
164 equipment converting non-electric energy into electric energy
165 751.3.2
166 bidirectional protective device
167 protective device where it is intended that a source of supply is connected to either or both sets
168 of connection terminals
169 751.3.3
170 unidirectional protective device
171 protective device where it is intended that a source of supply is only connected to one defined
172 set of connection terminals

IEC 60364-7-751 ED1 © IEC 2025 7 64/2749/CDV
173 751.3.4
174 Stand-alone generating set
175 generating set intended to be the single source of supply to one or more items of current -using
176 equipment
177 751.31 Purposes, supplies and structure
178 751.312 Conductor arrangement and system earthing
179 751.312.2 Types of system earthing
...