IEC 61112:2009

IEC 61112 ®
Edition 2.0 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Live working – Electrical insulating blankets

Travaux sous tension – Nappes isolantes électriques

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IEC 61112 ®
Edition 2.0 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Live working – Electrical insulating blankets

Travaux sous tension – Nappes isolantes électriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 13.260; 29.240.20; 29.260.99 ISBN 978-2-88910-414-7
– 2 – 61112 © IEC:2009
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .8
4 Requirements .9
4.1 General .9
4.2 Classification.9
4.3 Physical requirements .9
4.3.1 Composition .9
4.3.2 Shape and design.9
4.3.3 Dimensions and tolerances.11
4.3.4 Workmanship and finish .11
4.4 Mechanical, climatic and environmental requirements .12
4.5 Dielectric requirements.12
4.6 Marking .12
4.7 Packaging .13
4.8 Instructions for use.13
5 Tests .13
5.1 General .13
5.2 Visual inspection and measurements.14
5.2.1 General .14
5.2.2 Classification.14
5.2.3 Composition .14
5.2.4 Dimensions, workmanship and finish .14
5.2.5 Thickness .14
5.3 Marking .15
5.3.1 Visual inspection and measurement .15
5.3.2 Durability of marking.15
5.4 Packaging and instructions for use .15
5.5 Mechanical tests .15
5.5.1 General .15
5.5.2 Tensile strength and elongation at break .15
5.5.3 Mechanical puncture resistance.16
5.5.4 Tension set for elastomer material.18
5.5.5 Tear resistance test for plastic material .18
5.6 Dielectric tests .19
5.6.1 General .19
5.6.2 Electrodes .20
5.6.3 Test equipment.22
5.6.4 Electrical test procedure .23
5.7 Ageing tests .24
5.8 Thermal tests .25
5.8.1 Flame retardance test.25
5.8.2 Low temperature folding test (except for category C blankets) .26
6 Tests on electrical insulating blankets with special properties.27

61112 © IEC:2009 – 3 –
6.1 General .27
6.2 Category A: Acid resistance .27
6.3 Category H: Oil resistance.27
6.4 Category Z: Ozone resistance .27
6.4.1 General .27
6.4.2 Test methods.28
6.5 Category M: Mechanical puncture resistance.29
6.6 Category C: Extremely low temperature folding test .29
7 Conformity assessment of electrical insulating blankets having completed the
production phase.29
8 Modifications .30
Annex A (informative) Guidelines for the selection of the class of electrical insulating
blankets in relation to nominal voltage of a system .31
Annex B (informative) In-service care and testing .32
Annex C (normative) Suitable for live working ; double triangle (IEC 60417-5216
(2002-10)).34
Annex D (normative) General type test procedure.35
Annex E (normative) Liquid for tests on electrical insulating blankets of category H –
Oil resistance.38
Annex F (normative) Classification of defects and tests to be allocated .39
Bibliography.40

Figure 1 – Example of plain design .10
Figure 2 – Example of slotted design .10
Figure 3 – Plan view of the dumb-bell test piece .16
Figure 4 – Test plates and needle for resistance to mechanical puncture.17
Figure 5 – Tear resistance test .19
Figure 6 – Test set-up for voltage proof test of electrical insulating blankets with
standard type of electrodes.20
Figure 7 – Test set-up for voltage proof test of electrical insulating blankets with
alternative type of electrodes .22
Figure 8 – Test set-up for voltage withstand test.23
Figure 9 – Test set-up for low and extremely low temperature folding tests.26
Figure 10 – Ozone resistance – Method B test set-up .28

Table 1 – Special properties .9
Table 2 – Common lengths and widths for electrical insulating blankets.11
Table 3 – Maximum thickness for electrical insulating blankets .
...