IEC 61112:2009

Live working - Electrical insulating blankets

IEC 61112:2009 is applicable to electrical insulating blankets for the protection of workers from accidental contact with live or earthed electrical conductors, apparatus or circuits and avoidance of short circuits on electrical installations. This second edition cancels and replaces the first edition, published in 1992, and its Amendment 1 (2002). This edition constitutes a technical revision. It includes the following significant technical changes from the previous edition:
- general review of the requirements and test provisions;
- limitation of the scope in terms of the minimum width of electrical insulating blankets in rolls;
- preparation of the elements of evaluation of defects, and general application of IEC 61318 Ed.3;
- revision of existing annexes;
- deletion of Annexes D and F, not applicable according to IEC 61318 Ed.3;
- introduction of a new normative Annex F on classification of defects.

Travaux sous tension - Nappes isolantes électriques

La CEI 61112:2009 est applicable aux nappes isolantes électriques pour la protection des travailleurs contre un contact accidentel avec des conducteurs électriques sous tension ou mis à la terre, des appareils ou des circuits, et contre les courts-circuits dans des installations électriques. Cette édition annule et remplace la première édition publiée en 1992 ainsi que son Amendement 1 (2002), et constitue une révision technique. Elle inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- la révision générale des exigences et des dispositions d'essai;
- la limitation de l'étendue du domaine d'application en ce qui a trait à la largeur minimale des nappes isolantes électriques en rouleaux;
- la préparation des éléments d'évaluation des défauts et de l'application générale de la CEI 61318 Ed.3;
- la révision des annexes existantes;
- la disparition des Annexe D et F qui ne sont plus applicables, en accord avec la CEI 61318 Ed.3;
- l'introduction d'une nouvelle Annexe F normative traitant de la classification des défauts.

General Information

• Status: Published
• Publication Date: 06-Apr-2009
• ICS: 13.260 - Protection against electric shock. Live working
• ICS: 29.240.20 - Power transmission and distribution lines
• ICS: 29.260.99 - Other electrical equipment for working in special conditions
• Technical Committee: TC 78 - Live working
• Drafting Committee: WG 13 - TC 78/WG 13
• Current Stage: PPUB - Publication issued
• Start Date: 30-Apr-2009
• Completion Date: 07-Apr-2009

Relations

• Revises: IEC 61112:1992 - Blankets of insulating material for electrical purposes
• Effective Date: 05-Sep-2023
• Revises: IEC 61112:1992/COR1:2000 - Corrigendum 1 - Blankets of insulating material for electrical purposes
• Effective Date: 05-Sep-2023
• Revises: IEC 61112:1992/AMD1:2002 - Amendment 1 - Blankets of insulating material for electrical purposes
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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 .
...