SIST-TS IEC TS 63527:2025
(Main)Safe management and operation of electrical installations (IEC TS 63527:2025)
Safe management and operation of electrical installations (IEC TS 63527:2025)
This document is applicable to the safe management and operation (3.1.2) of and work activity
(3.4.1) on, with, or near electrical installations operating at voltage levels from, and including,
extra-low voltage up to and including high voltage.
This latter term includes those levels commonly referred to as medium and extra-high voltage.
These electrical installations are designed for the generation, transmission, conversion,
distribution and use of electrical power. Some of these electrical installations are permanent
and fixed, such as a distribution installation in a factory or office complex. Others are temporary,
such as on construction sites, and some are mobile or capable of being moved either whilst
energized or whilst not energized nor charged, examples are electrically driven excavating
machines in quarries or open-cast coal sites.
This document sets out the requirements for the safe management and operation (3.1.2) of and
work activity (3.4.1) on, with, or near these electrical installations. The requirements apply to
all operational, working and maintenance procedures. They apply to all non-electrical work
(3.4.3) such as building work near to overhead lines or underground cables as well as electrical
work (3.4.2), when there is a risk (3.1.3) of electrical danger (3.1.5).
This document does not apply to ordinary persons (3.2.7) when using installations and
equipment, provided that the installations and equipment comply with relevant standards and
are designed and installed for use by ordinary persons (3.2.7).
This document has not been developed specifically to apply to the electrical installations listed
below. However, if there are no other rules or procedures, the principles of this document could
be applied to them:
– on any aircraft and hovercraft moving under its own power, (international aviation laws can
apply);
– on any sea going ship moving under its own power, or under the direction of the master,
(international marine laws can apply);
– electronic telecommunications and information systems;
– electronic instrumentation, control and automation systems;
– at coal or other mines;
– on off-shore installations (international marine laws can apply);
– on vehicles;
– on electric traction systems;
– on experimental electrical research work.
Gestion et exploitation en toute sécurité des installations électriques (IEC TS 63527:2025)
Varno upravljanje in obratovanje električnih postrojev (IEC TS 63527:2025)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2025
Varno upravljanje in obratovanje električnih postrojev (IEC TS 63527:2025)
Safe management and operation of electrical installations (IEC TS 63527:2025)
Gestion et exploitation en toute sécurité des installations électriques (IEC TS
63527:2025)
Ta slovenski standard je istoveten z: IEC TS 63527:2025
ICS:
29.260.10 Električne inštalacije za Electrical installations for
uporabo na prostem outdoor use
91.140.01 Napeljave v stavbah na Installations in buildings in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
IEC TS 63527 ®
Edition 1.0 2025-08
TECHNICAL
SPECIFICATION
Safe management and operation of electrical installations
ICS 29.260.10; 91.140.01 ISBN 978-2-8327-0634-3
CONTENTS
FOREWORD. 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
3.1 General . 9
3.2 Personnel, organization and communication . 10
3.3 Working zone . 12
3.4 Working . 12
3.5 Protective devices . 14
3.6 Voltages . 15
3.7 Distances . 15
3.8 Miscellaneous . 17
3.9 Symbols . 17
4 Basic principles . 18
4.1 Safe operation (3.1.2) . 18
4.2 Personnel . 19
4.3 Organization . 19
4.3.1 General . 19
4.3.2 The installation manager (3.2.1) . 20
4.3.3 The operation controller (3.2.2) . 20
4.3.4 The work controller (3.2.3) . 20
4.3.5 The worker (3.2.4) . 20
4.3.6 Skilled person in electricity . 21
4.3.7 Instructed person in electricity . 21
4.3.8 ordinary person (3.2.7) in electricity . 21
4.3.9 Complexity of work activity (3.4.1) . 21
4.3.10 Objections for safety . 21
4.4 Communication (transmission of information) . 22
4.5 Work location . 22
4.6 Tools, equipment and devices . 22
4.7 Drawings and records . 23
4.8 Signs . 23
4.9 Emergency arrangements . 23
4.10 Types of supervision (3.4.11) . 24
4.11 Determination of distances . 24
4.11.1 General . 24
4.11.2 Limit distances . 24
4.11.3 Determination of working distances . 28
4.12 Assessment of competence (3.8.2) and authorization (3.4.9) of persons . 28
4.13 Planning the work . 29
4.14 electrical safety rules (3.2.9) . 30
5 Operational procedures . 31
5.1 General . 31
5.2 Operating activities . 31
5.3 Measurement . 32
5.4 Testing . 32
5.5 Inspection . 32
6 Working procedures . 33
6.1 General . 33
6.1.1 General requirements . 33
6.1.2 Specific requirements in case of induction . 35
6.1.3 Specific requirements according to weather conditions . 35
6.2 Dead working (3.4.8) . 35
6.2.1 General . 35
6.2.2 Disconnect completely . 36
6.2.3 Secure against re-connection . 36
6.2.4 Verify absence of operating voltage (3.6.4) . 36
6.2.5 Earthing and short-circuiting . 37
6.2.6 Protection against adjacent live parts . 39
6.2.7 permission to start work (3.4.10) . 39
6.2.8 Re-energizing after work . 39
6.3 Live working (3.4.4) . 39
6.3.1 General . 39
6.3.2 Training and qualification . 40
6.3.3 Maintenance of personnel ability . 40
6.3.4 Working methods . 40
6.3.5 Working instructions . 41
6.3.6 Tools, equipment and devices . 41
6.3.7 Environmental conditions . 41
6.3.8 Organization of work . 42
6.3.9 Specific requirements for extra-low voltage installations . 43
6.3.10 Specific requirements for low voltage installations . 43
6.3.11 Specific requirements for high voltage installations . 43
6.3.12 Specific works on live parts . 43
6.4 Working within the vicinity zone (3.4.5) . 43
6.4.1 General . 43
6.4.2 Protection by screen (3.5.1), barrier (3.5.2), enclosure (3.5.4) or
protective cover (3.5.3) . 44
6.4.3 Protection by safe distance and supervision (3.4.11) . 45
6.5 Working outside the vicinity zone (3.3.3) . 45
6.5.1 General . 45
6.5.2 Specific requirements for non-electrical work (3.4.3), e.g. construction
work, and electrical work (3.4.2) . 45
7 Maintenance procedures . 46
7.1 General . 46
7.2 Personnel . 47
7.3 Repair work . 47
7.4 Replacement work . 48
7.4.1 Replacement of fuses . 48
7.4.2 Replacement of lamps and accessories . 48
7.5 Temporary interruption of maintenance work . 48
7.6 End of maintenance work . 48
Annex A (informative) Guidance for distances in air for working procedures . 49
A.1 Limit distances . 49
A.2 Working distances . 49
A.2.1 General . 49
A.2.2 Determination of the distance value related to the voltage level . 49
A.2.3 Considerations of tools, devices or equipment . 49
A.2.4 Ergonomic considerations . 50
A.2.5 Working distance for live working . 50
A.2.6 Working distance for working within the vicinity zone . 51
A.2.7 Working distance for working outside the vicinity zone . 52
Annex B (informative) Additional information for safe working . 54
B.1 Example for responsibility levels . 54
B.1.1 General scheme . 54
B.1.2 Domestic . 54
B.1.3 Small company or craftsman . 55
B.1.4 Large or Industrial company . 55
B.2 Example of application of live working . 55
B.3 Atmospheric conditions that are part of environmental conditions to be
assessed . 55
B.3.1 Precipitation . 55
B.3.2 Thick fog . 55
B.3.3 Thunderstorms . 55
B.3.4 Violent wind . 56
B.3.5 Salt storms . 56
B.3.6 Extra low temperature . 56
B.4 F
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