IEC TR 61328:2017

IEC TR 61328 ®
Edition 3.0 2017-04
TECHNICAL
REPORT
colour
inside
Live working – Guidelines for the installation of transmission and distribution
line conductors and earth wires – Stringing equipment and accessory items
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IEC TR 61328 ®
Edition 3.0 2017-04
TECHNICAL
REPORT
colour
inside
Live working – Guidelines for the installation of transmission and distribution

line conductors and earth wires – Stringing equipment and accessory items

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.260; 29.240.20; 29.260.99 ISBN 978-2-8322-4130-1

– 2 – IEC TR 61328:2017 © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Understanding the hazard – Basic theory . 17
4.1 General . 17
4.2 Electric field induction from nearby circuits . 17
4.2.1 Overview . 17
4.2.2 Induced voltage . 18
4.2.3 Induced current . 19
4.2.4 Electrostatic charging . 20
4.3 Magnetic field induction from nearby circuits . 20
4.3.1 Induced current . 20
4.3.2 Induced voltage . 21
4.4 Re-energization . 22
4.5 Mechanical risk . 22
5 Conductor stringing methods and equipment . 23
5.1 General . 23
5.2 Slack stringing method . 23
5.3 Tension stringing method . 25
5.4 Stringing equipment . 34
5.4.1 General. 34
5.4.2 Tensioners . 34
5.4.3 Pullers . 37
5.4.4 Reel winders . 41
5.4.5 Reel stands . 42
5.4.6 Pilot rope puller . 43
5.4.7 Pilot rope, pulling rope . 43
5.4.8 Woven wire grip . 44
5.4.9 Stringing blocks . 44
5.4.10 Stringing rollers . 47
5.4.11 Stringing block earth . 48
5.4.12 Running earth . 49
5.4.13 Hold-down block . 49
5.4.14 Conductor car . 49
5.5 Communications . 53
6 Special earthing requirements . 53
6.1 General . 53
6.2 Work site earthing systems . 54
6.2.1 Overview . 54
6.2.2 Use of earth rods . 55
6.2.3 Equipment earths . 56
6.2.4 Earths for conductor, earth wire, metallic and synthetic rope . 56
6.2.5 Earths for earth mat, conductors or earth wires . 56
6.2.6 Earths for mid-span joining of conductors or earth wires . 56

6.2.7 Earths for clipping in the conductors or earth wires . 57
6.2.8 Earths for installation of jumper loops for the conductor . 57
6.2.9 Stringing block earths . 57
6.2.10 Earth mat . 57
6.3 General procedures and use of earthing systems . 62
6.3.1 Overview . 62
6.3.2 General procedures . 62
6.3.3 Installation of the pilot or pulling rope . 63
6.3.4 Stringing of conductors . 64
6.3.5 Splicing of conductors . 65
6.3.6 Sagging of conductors . 66
6.3.7 Clipping-in conductors . 67
6.3.8 Dead-ending and installation of jumper loops . 67
6.3.9 Spacing . 68
6.3.10 Special work on conductors . 68
6.3.11 Fuelling . 69
7 Testing of earthing devices . 69
7.1 General . 69
7.2 Number of type tests . 70
7.3 Type test set-up . 70
7.4 Type test acceptance criterion . 70
Bibliography . 73

Figure 1 – Electric field induction from nearby circuits – Induced voltage . 18
Figure 2 – Electric field induction from nearby circuits – Induced current . 19
Figure 3 – Magnetic field induction from nearby circuits – Induced current . 21
Figure 4 – Magnetic field induction from nearby circuits – Induced voltage . 22
Figure 5 – Slack stringing method . 25
Figure 6 – Tension stringing method . 33
Figure 7 – Bullwheel tensioners . 37
Figure 8 – Bullwheel pullers . 41
Figure 9 – Stringing blocks . 47
Figure 10 – Stringing rollers . 48
Figure 11 – Conductor cars . 50
Figure 12 – Earthing systems . 62
Figure 13 – Typical test set-up for stringing block earth . 71
Figure 14 – Typical test set-up for running earth . 72

– 4 – IEC TR 61328:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LIVE WORKING – GUIDELINES FOR THE INSTALLATION
OF TRANSMISSION AND DISTRIBUTION LINE CONDUCTORS AND
EARTH WIRES – STRINGING EQUIPMENT AND ACCESSORY ITEMS

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 Organi
...