Live working - Portable equipment for earthing or earthing and short-circuiting

IEC 61230:2008 is applicable to portable equipment, with or without matching connection points, for temporary earthing or earthing and short-circuiting of electrically isolated or de-energized a.c. and d.c. installations, distribution and transmission networks, whether they are overhead or underground or of low or high voltage. This standard covers equipment comprising an earthing or a short-circuiting or an earthing and short-circuiting device and insulating component. The performance of equipment, devices and components covered by this standard is based on electro-dynamic and electro-thermal effects acting during short-circuit. The withstand capability of the devices and equipment is expressed by their rated values of current, time and peak factor. No rated voltage is given, but the geometrical dimensions of the equipment are also linked to the voltage of the installation. This second edition cancels and replaces the first edition published in 1993. It constitutes a technical revision. The major changes are:
- extension of the scope to cover the use of equipment on d.c. installations;
- extension of the use of aluminium to all conductive parts of the device;
- possibility of using this standard for separate components of the equipment;
- general revision of requirements and tests;
- revision of existing annexes;
- introduction of a new informative Annex D giving guidelines for determination of the equivalent r.m.s. value of a short-circuit current and of a new normative Annex F on classification of defects.

Travaux sous tension - Equipements portables de mise à la terre ou de mise à la terre et en court-circuit

La CEI 61230:2008 est applicable aux équipements portables avec ou sans points de connexion assortis, pour mise temporaire à la terre ou mise à la terre et en court-circuit des installations électriques à courant alternatif ou à courant continu, isolées ou hors tension, des réseaux de distribution et de transport, qu'ils soient aériens ou souterrains et de tension basse ou haute. La présente norme couvre l'équipement comprenant un dispositif de mise à la terre ou de court-circuit, ou de mise à la terre et en court-circuit, et un composant isolant. La performance des équipements, dispositifs et composants couverts par la présente norme, est basée sur les effets électrodynamiques et électrothermiques mis en jeu durant le court-circuit. La capacité de tenue des équipements et dispositifs est exprimée par leurs valeurs assignées de courant, de temps et de facteur de crête. Aucune tension assignée n'est donnée mais les dimensions géométriques de l'équipement sont liées à la tension de l'installation. La seconde édition annule et remplace la première édition publiée en 1993. Cette édition constitue une révision technique. Les principaux changements sont:
- l'extension du domaine d'application pour couvrir l'usage des équipements sur des installations à courant continu;
- l'extension de l'usage de l'aluminium à toutes les parties conductrices du dispositif;
- la possibilité d'utiliser la présente norme pour des composants séparés de ces équipements;
- la révision générale des exigences et des essais;
- la révision des annexes existantes;
- l'introduction d'une nouvelle Annexe D informative proposant un guide pour déterminer la valeur efficace équivalente d'un courant de court-circuit et d'une nouvelle Annexe F normative traitant de la classification des défauts.

General Information

Status
Published
Publication Date
08-Jul-2008
Technical Committee
Current Stage
PPUB - Publication issued
Start Date
09-Jul-2008
Completion Date
09-Jul-2008
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IEC 61230
Edition 2.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Live working – Portable equipment for earthing or earthing and short-circuiting
Travaux sous tension – Equipements portables de mise à la terre ou de mise à la
terre et en court-circuit
IEC 61230:2008
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 61230
Edition 2.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Live working – Portable equipment for earthing or earthing and short-circuiting
Travaux sous tension – Equipements portables de mise à la terre ou de mise à la
terre et en court-circuit
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 13.260; 29.240.20; 29.260.99 ISBN 2-8318-9875-7
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61230 © IEC:2008
CONTENTS

FOREWORD...........................................................................................................................5

INTRODUCTION.....................................................................................................................7

1 Scope...............................................................................................................................8

2 Normative references .....................................................................................................12

3 Terms and definitions .....................................................................................................13

4 Requirements .................................................................................................................17

4.1 General .................................................................................................................17

4.2 Electrical rating .....................................................................................................18

4.3 Cables for earthing and short-circuiting .................................................................18

4.3.1 Selection of cables ....................................................................................18

4.3.2 Earthing cables used on solidly earthed (neutral) systems.........................19

4.3.3 Earthing cables used on non-solidly earthed (neutral) systems..................19

4.4 Short-circuiting bars ..............................................................................................19

4.5 Connections of cables to rigid parts within devices ................................................20

4.6 Clamps..................................................................................................................20

4.7 Earthing and short-circuiting device.......................................................................20

4.8 Basic safety requirements for the insulating element(s) of the insulating

component ............................................................................................................21

4.9 Marking .................................................................................................................21

4.9.1 General .....................................................................................................21

4.9.2 Marking on earthing and short-circuiting device .........................................21

4.9.3 Marking on clamp ......................................................................................22

4.9.4 Marking on cable .......................................................................................22

4.9.5 Marking on other components....................................................................22

4.10 Instructions for use................................................................................................22

5 Tests ..............................................................................................................................23

5.1 General .................................................................................................................23

5.2 Verification and checking ......................................................................................23

5.3 Tests for the selection of cables ............................................................................24

5.3.1 Cables complying with IEC 61138..............................................................24

5.3.2 Cables not complying with IEC 61138........................................................24

5.4 Fatigue and humidity penetration tests on cable with end fittings...........................24

5.4.1 Fatigue test ...............................................................................................24

5.4.2 Humidity penetration test...........................................................................26

5.5 Tension test on cable with end fittings...................................................................26

5.6 Test on clamps, permanent connection points and connections .............................27

5.6.1 Tests for tightening types ..........................................................................27

5.6.2 Tests for non-tightening types ...................................................................27

5.7 Short-circuit current test ........................................................................................27

5.7.1 General .....................................................................................................27

5.7.2 Preparation of test pieces..........................................................................29

5.7.3 Test set-ups and test arrangements...........................................................33

5.7.4 Test current, Joule-integral and duration ...................................................34

5.7.5 Documentation and evaluation of the test ..................................................35

5.7.6 Alternative means to short-circuit current test for conformity

assessment during production phase.........................................................36

---------------------- Page: 4 ----------------------
61230 © IEC:2008 – 3 –

5.8 Durability of marking .............................................................................................36

6 Conformity assessment ..................................................................................................36

7 Modifications ..................................................................................................................36

Annex A (informative) Guidelines for portable equipment for earthing to be used on

railway systems ....................................................................................................................37

Annex B (informative) Guidelines for earthing sticks ............................................................41

Annex C (informative) Guidelines for selection, use and maintenance of portable

earthing or earthing and short-circuiting equipment...............................................................45

Annex D (informative) Guideline for determination of the equivalent r.m.s. value of a

short-time current during a short-circuit of a given duration...................................................56

Annex E (normative) List of type tests..................................................................................58

Annex F (normative) Classification of defects ......................................................................59

Bibliography..........................................................................................................................60

Figure 1 – Examples of portable equipment and device for installations, network and

railway systems application.....................................................................................................9

Figure 2 – Connection diagrams of single and multi-phase earthing and short-

circuiting devices for network application ..............................................................................11

Figure 3 – Illustration of a three-phase earthing and short-circuiting device with short-

circuiting bar and earthing cable(s) for installation and network application...........................12

Figure 4 – Apparatus for fatigue testing with bending and twisting ........................................25

Figure 5 – Examples of multiple combinations of clamps accommodating different

shapes and sizes of connection points ..................................................................................29

Figure 6 – Test set-ups for testing multi-phase devices connected between rigid

conductors for substations ....................................................................................................31

Figure 7 – Test set-ups for testing multi-phase short-circuiting devices for overhead

lines......................................................................................................................................32

Figure 8 – Test set-ups for testing single-phase devices for overhead lines and for

open air substations..............................................................................................................33

Figure 9 – Shape of the short-circuit current during test........................................................35

Figure A.1 – Test set-up for testing single phase equipment for railway systems ..................39

Figure B.1 – Arrangement for bending tests on earthing sticks of circular cross-section........43

Figure B.2 – Arrangement for torsion tests on earthing sticks of circular cross-section..........44

Figure C.1 – Curves representing the temperature heating of different nature of

conductors related to the value of the Joule-integral J t........................................................49

Figure C.2 – Determination of conductor temperature from heating.......................................50

Figure C.3 – Determination of J t..........................................................................................51

Figure C.4 – Example of the usable region for a device ........................................................53

Figure D.1 – Determination of short-time current...................................................................57

Table 1 – Usual lengths of earthing and short-circuiting cables for different types of

installations and different voltage levels................................................................................11

Table 2 – Minimum cross-section of earthing cables related to the cross-section of the

short-circuiting cables and/or bars on non-solidly earthed (neutral) systems .........................19

Table 3 – Tension test force on cable with end fittings ..........................................................27

Table A.1 – Short circuit values for copper cable with a maximum temperature of

450 °C ..................................................................................................................................40

---------------------- Page: 5 ----------------------
– 4 – 61230 © IEC:2008

Table B.1 – Maximum deflection ...........................................................................................43

Table C.1 – Comparison of different standard values of nominal cross-sections....................47

Table C.2 – Short-circuit close to generator – Short-circuit current values in kA for

copper cables with a maximum temperature of 300°C ...........................................................48

Table E.1 – List of type tests referred to subclauses .............................................................58

Table F.1 – Classification of defects and associated requirements and tests ........................59

---------------------- Page: 6 ----------------------
61230 © IEC:2008 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LIVE WORKING –
PORTABLE EQUIPMENT FOR EARTHING OR
EARTHING AND SHORT-CIRCUITING
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 Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61230 has been prepared by IEC technical committee 78: Live

working.

This second edition cancels and replaces the first edition published in 1993. It constitutes a

technical revision.
The major changes are:
– extension of the scope to cover the use of equipment on d.c. installations;
– extension of the use of aluminium to all conductive parts of the device;

– extension of the application to silicone rubber cables made by the revision of TC 20

document IEC 61138;
– possibility of using this standard for separate components of the equipment;
– general revision of requirements and tests;

– deletion of the marking requirement of the double triangle to clarify that the products

covered by the standard are not appropriate for performing live working;
---------------------- Page: 7 ----------------------
– 6 – 61230 © IEC:2008
– clarification and modification to the procedure for short-circuit test:
• change of the number of devices submitted to test,
• change of the pre-conditioning time to 48 h,
• clarification of the test procedure for separate components,

– application of conformity assessment for products having completed the production phase,

according to IEC 61318 Ed.3;
– revision of existing annexes;

– change of normative Annexes A and C into informative Annexes C and B with a reviewed

wording;
– deletion of Annex B, not applicable according to IEC 61318 Ed.3;

– deletion of Annex D, its requirements and tests being now included in the body of the

standard;
– introduction of a new informative Annex A on railway application;

– introduction of a new informative Annex D giving guidelines for determination of the

equivalent r.m.s. value of a short-circuit current;
– revision of the list of type tests, which now appears in normative Annex E;
– introduction of a new normative Annex F on classification of defects.
The text of this standard is based on the following documents:
FDIS Report on voting
78/741/FDIS 78/748/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.

The committee has decided that the contents of this publication will remain unchanged until

the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in

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

• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 8 ----------------------
61230 © IEC:2008 – 7 –
INTRODUCTION

This International Standard has been prepared in accordance with the requirements of

IEC 61477.

An agreement may be made between manufacturer and customer for additional requirements,

and tests. These additional requirements are prescribed in the customer's specification on the

basis of an acceptance procedure.
---------------------- Page: 9 ----------------------
– 8 – 61230 © IEC:2008
LIVE WORKING –
PORTABLE EQUIPMENT FOR EARTHING OR
EARTHING AND SHORT-CIRCUITING
1 Scope

This International Standard is applicable to portable equipment, with or without matching

connection points, for temporary earthing or earthing and short-circuiting of electrically

isolated or de-energized a.c. and d.c. installations, distribution and transmission networks,

whether they are overhead or underground or of low or high voltage.
NOTE Annex A provides guidance for application to railway systems.

This standard covers equipment comprising an earthing or a short-circuiting or an earthing

and short-circuiting device and insulating component. An example is given in Figure 1a and

Figure 1b.
It also covers:

– earthing or short-circuiting or earthing and short-circuiting devices intended to be installed

with insulating means. An example of an earthing device is given in Figure 1c;

– separate components, such as conductive extension (see Figure 1b) or clamp or cable

with end fittings.

The performance of equipment, devices and components covered by this standard is based

on electro-dynamic and electro-thermal effects acting during short-circuit. The withstand

capability of the devices and equipment is expressed by their rated values of current, time

and peak factor. No rated voltage is given, but the geometrical dimensions of the equipment

are also linked to the voltage of the installation.

Examples of connection diagrams of earthing and short-circuiting devices are given in

Figures 2 and 3. Associated usual lengths of cables are given in Table 1.
Not covered in this standard are:

– insulating means, such as insulating sticks, telescopic sticks, insulating handles,

insulating gloves, aerial devices with insulating booms, insulating ropes to be used to

install the earthing and short-circuiting device;

– insulating components, except for basic safety requirements for the insulating element;

NOTE Basic safety recommendations for earthing sticks are given in Annex B.
– devices meant only for the draining of induced currents;

– relevant working procedures for using portable equipment for earthing or earthing and

short-circuiting.

NOTE The equipment complying with this standard should be used according to safe working procedures and

according to local or national regulation, such as live working or dead working procedures.

---------------------- Page: 10 ----------------------
61230 © IEC:2008 – 9 –
Figure 1a – Multi-phase equipment Figure 1b – Single-phase equipment with
extension
Key
1 Earth clamp or rail clamp
2 Line clamp or contact line clamp
3 Short-circuiting cable(s)
4 Earthing cable(s)
5 Connecting cluster
6 Earth permanent connection point or rail
7 Line permanent connection point or
overhead contact line profile
8 Insulating element
9 Handle limit mark
10 Handle of earthing stick
11 Installation conductor or bar
12 Earthing system
13 End cap of stick
14 End fitting, permanent or detachable
15 Stick coupling, detachable for transport
reasons
16 Conductive extension
I Length of insulating element
L Length of handle
L Overall length of earthing stick and
conductive extension component
NOTE 1 The earthing and short-circuiting
device comprises components 1, 2, 3, 4, 5 and
16.
NOTE 2 The earthing stick comprises
components 8, 9, 10, 13, 14 and 15.
NOTE The same device can also be used for short-circuiting.
NOTE 3 The earthing device comprises
components 1, 2 and 4.
Figure 1c – Earthing device
Figure 1 – Examples of portable equipment and device
for installations, network and railway systems application
---------------------- Page: 11 ----------------------
– 10 – 61230 © IEC:2008
Figure 2b
Figure 2a
Figure 2d
Figure 2c
Key
1 Earth clamp
2 Line clamp
3 Short-circuiting cable(s)
4 Earthing cable(s)
5 Connecting cluster
11 Installation conductor or
bar
16 Conductive extension
HVA (Y) = High voltage distribution , Y Neutral system
LV (Δ) = Low voltage, Δ Neutral system
Figure 2e
---------------------- Page: 12 ----------------------
61230 © IEC:2008 – 11 –
Figure 2f Figure 2g
Figure 2 – Connection diagrams of single and multi-phase earthing
and short-circuiting devices for network application

NOTE Figure 2 shows examples only of connection arrangements. Not all are suitable for all situations. It is the

responsibility of the user to consider movement of connecting cables from magnetic forces. This has to be

considered prior to a final connection.
Table 1 – Usual lengths of earthing and short-circuiting cables
for different types of installations and different voltage levels
Classes of
Metal enclosed or
operating Overhead line Open air substation
indoor substation
voltages
Multi-phase Multi-phase
Figures 2a, 2b, 2c, 2d Figure 2c ; key 3 = 0,5 m
key 3 = 0,5 m Figure 2a ; key 3 = 0,5 m and
a key 4 = 12 m to 16 m key 4 = 1 m to 10 m
Low voltage Specific
Single-phase
Figure 2f
key 4 = 0,5 m to 10 m
Multi-phase Multi-phase Multi-phase
Figures 2a, 2b, 2c, 2d Figures 2a, 2b, 2c Figure 2a
key 3 = 2 m to 2,5 m key 3 = 7,5m to 10 m key 3 = 0,7 m
key 4 = 8 m to 10 m key 4 = 2,5 m to 3 m key 4 = 2 m
a Multi-phase + 5 m extension
Distribution
Figure 2g
key 4 = 8 m to 10 m
Single-phase Single-phase
Figure 2f Figure 2f
key 4 = 8 m to 10 m key 4 = 10 m to 12 m
Single-phase Single-phase Multi-phase
Figure 2f Figure 2f Figure 2a
key 4 = 10 m to 12 m key 3 = 3 m
key 4 = 8 m
key 4 = 3 m
Transmission
Single-phase + Single-phase
2 m to 5 m extension Figure 2f
Figure 2g key 4 = 3 m to 4 m
key 4 = 7 m to 8 m

The voltage limits for the different classes of operating voltage are conventional values and could be modified

by national regulations or national practice.
---------------------- Page: 13 ----------------------
– 12 – 61230 © IEC:2008
Key
1 Earth clamp
2 Line clamp
4 Earthing cable(s)
11 Installation conductor
17 Short-circuiting bar
18 Earthing cable connection
Figure 3 – Illustration of a three-phase earthing and short-circuiting device

with short-circuiting bar and earthing cable(s) for installation and network application

2 Normative references

The following referenced documents are indispensable for the application of this document.

For dated references, only the edition cited applies. For undated references, the latest edition

of the referenced document (including any amendments) applies.

IEC 60060-1:1989 High voltage test techniques – Part 1: General definitions and test

requirements
IEC 60068-2-11:1981, Environmental testing – Part 2: Tests – Test Ka: Salt mist

IEC 60068-2-42:2003, Environmental testing – Part 2-42: Tests – Test Kc: Sulphur dioxide

test for contacts and connections

IEC 60811-1-4:1985, Common test methods for insulating and sheathing materials of electric

cables – Part 1: Methods for general application – Section Four: Tests at low temperature

Amendment 1 (1993)
Amendment 2 (2001)
—————————
Under rev
...

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