Sleeves of insulating material for live working

Applies to insulating sleeves for the protection of workers from accidental contact with live electrical conductors, apparatus or circuits.

Isolierende Ärmel zum Arbeiten unter Spannung

Protège-bras en matériaux isolants pour travaux électriques

S'applique aux protège-bras isolants destinés à protéger les travailleurs contre les contacts accidentels avec des conducteurs, des appareils ou des circuits sous tension.

Rokavi iz izolacijskega materiala za delo pod napetostjo (IEC 60984:1990 (Spremenjen))

General Information

Status
Published
Publication Date
08-Oct-1992
Current Stage
6060 - Document made available
Due Date
09-Oct-1992
Completion Date
09-Oct-1992

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SLOVENSKI STANDARD
SIST EN 60984:2000
01-junij-2000
Rokavi iz izolacijskega materiala za delo pod napetostjo (IEC 60984:1990
(Spremenjen))
Sleeves of insulating material for live working
Isolierende Ärmel zum Arbeiten unter Spannung
Protège-bras en matériaux isolants pour travaux électriques
Ta slovenski standard je istoveten z: EN 60984:1992
ICS:
13.260 9DUVWYRSUHGHOHNWULþQLP Protection against electric
XGDURP'HORSRGQDSHWRVWMR shock. Live working
13.340.10 Varovalna obleka Protective clothing
SIST EN 60984:2000 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60984:2000
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SIST EN 60984:2000
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SIST EN 60984:2000
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SIST EN 60984:2000
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SIST EN 60984:2000
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SIST EN 60984:2000
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SIST EN 60984:2000
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SIST EN 60984:2000
NORME CEI
INTERNATIONALE IEC
60984
INTERNATIONAL
Première édition
STAN DARD
First edition
1990-02
Protège-bras en matériaux isolants
pour travaux électriques
Sleeves of insulating material
for live working
de reproduction réservés — Copyright - all rights reserved
© IEC 1990 Droits

Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in

any form or by any means, electronic or mechanical,
utilisée sous quelque forme que ce soit et par aucun

procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in

copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.

International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX /^
Commission Electrotechnique Internationale
V V
PRICE CODE
International Electrotechnical Commission
IEC
MemayHapogHaR 3nenrporexHHVecnaf HonnHCCHa
vigueur
Pour prix, voir catalogue en
• •
For price, see current catalogue
---------------------- Page: 9 ----------------------
SIST EN 60984:2000
Publication 60984 de la CEI IEC Publication 60984
(Première édition – 1990) (First edition – 1990)
Protège-bras en matériaux isolants Sleeves of insulating materiel
pour travaux électriques – for live working –
CORRIGENDUM 1

Le comité technique 78 est toujours attentif à Technical committee 78 continues to monitor the

l'emploi en travaux sous tension de matériaux et de use of chemicals and materials in live working that

tout en étant adéquats,
produits chimiques qui, are suitable and provide for safety, occupational
ainsi que

assurent la santé et la sécurité au travail health and environmental protection. As a result,

la protection de l'environnement. En conséquence, a suitable solvent has been found to replace the

un solvant adéquat a ét é identifié pour remplacer le previously used trichloro-1,1,2 trifluoro-1,2,2 ethane

trichloro-1,1,2 trifluoro-1,2,2 éthane (aussi connu (also known as trifluorotrichloroethane, Freon and

Refrigerant 113).
sous les appellations trifluorotrichloroéthane, Fréon
et Réfrigérant 113), utilisé au préalable.
Page 28 Page 29
6.4.2.3 Electrodes liquides, 6.4.2.3 Water electrodes,
montage droit straight mounting
Note 2, première phrase
Note 2, first sentence
Au lieu de: Instead of:
Un liquide diélectrique liquid
satisfaisant est le One satisfactory dielectric is

trichlorotrifluoréthane (réfrigérant 113). trichlorotrifluoroethane (Refrigerant 113).

lire: read:

Deux liquides diélectriques satisfaisants sont Two satisfactory dielectric liquids are

le méthoxy-nonafluorobutane (C4 F9OCH 3) methoxy-nonafluorobutane (C F OCH ) and
4 9 3
et le 2,3-dihydrodécafluoropentane (C H F H F ).
2,3-dihydrodecafluoropentane (C
5 2 10). 5 2 10
Ajouter la note 5 suivante: Add the following note 5:

NOTE Il est du devoir d’un employeur de s’assurer NOTE It is the duty of an employer to ensure that

que la législation applicable ainsi que les prescriptions the relevant legislation and safety requirements for

de sécurité propres à l’usage du produit chimique the use of the selected chemical are complied with

utilisé sont respectées intégralement. in their entirety.
Juillet 1999 July 1999
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SIST EN 60984:2000
C E I 60984 IEC 60984
(Première édition – 1990)
(First edition – 1990)
Protège-bras en matériaux isolants Sleeves of insulating material
électriques for live working
pour travaux
CORRIGENDUM 2
Page 4 Page 5
PRÉFACE PREFACE
Supprimer: Delete:
410 (1973): Plans et règles d'échan- 410 (1973): Sampling plans and
tillonnage pour les contrôles par procedures for inspection by attributes.
attributs.
Ajouter la publication suivante: Add the following publication:
ISO 2859-1 :1999, Règles d'échantillon- ISO 2859-1:1999, Sampling procedures
nage pour les contrôles par attributs – for inspection by attributes – Part 1:
Partie 1: Procédures d'échantillonnage Sampling schemes indexed by acceptance

pour les contrôles lot par lot, indexés quality limit (AQL) for lot-by-lot inspection

d'après le niveau de qualité acceptable
(NQA)
Page 55
Page 54
Annexe E Appendix E
E1. Généralités E1. General
Premier alinéa First paragraph
Au lieu de: Instead of:
... la Publication 410 de la CEI. ... IEC Publication 410.
read:
lire:
... l’ISO 2859-1. ... ISO 2859-1.
Mai 2000
May 2000
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SIST EN 60984:2000
984 ©IEC - 3 -
CONTENTS
Page
FOREWORD 5
PREFACE 5
Clause
1. Scope 7
2 Definitions 7
3. Composition 9
4. Classification 9
5. Physical requirements 11
5.1 Shape 11
5.2 Dimensions 11
5.3 Thickness 13
5.4 Workmanship and finish 13
5.5 Marking 15
5.6 Packaging 17
6. Tests on sleeves 17
6.1 General 17
6.2 Visual inspection and measurements 17
6.3 Mechanical tests 21
6.4 Dielectric tests 25
6.5 Ageing tests 37
6.6 Thermal tests 37
7. Tests on sleeves with special properties 41
7.1 General 41
7.2 Category A - Acid resistance 41
7.3 Category H - Oil resistance 41
7.4 Category Z - Ozone resistance 43
7.5 Category S - Oil and ozone resistance 43
7.6 Category C - Resistance to extreme low temperature 45
8. Sampling procedure 45
APPENDIX A - Guidelines for the selection of the class of sleeve
in relation to nominal voltage of a system 47
APPENDIX B - (Reserved) 49
APPENDIX C - General test procedure 51
APPENDIX D - Oil for tests on sleeves of category H - Oil
resistance 53
APPENDIX E - Sampling procedure 55
APPENDIX F - Acceptance and complementary tests 61
APPENDIX G - In-service recommendations 65
FIGURES 69
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SIST EN 60984:2000
984 IEC - 5 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
SLEEVES OF INSULATING MATERIAL FOR LIVE WORKING
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters,
prepared by Technical Committees on which all the National Committees
having a special interest therein are represented, express, as nearly
as possible, an international consensus of opinion on the subjects
dealt with.
They have the form of recommendations for international use and they
are accepted by the National Committees in that sense.
3) In order to promote international unification, the IEC expresses the
wish that all National Committees should adopt the text of the IEC
recommendation for their national rules in so far as national
conditions will permit. Any divergence between the IEC recommendation
and the corresponding national rules should, as far as possible, be
clearly indicated in the latter.
4) The IEC has not laid down any procedure concerning marking as an
indication of approval and has no responsibility when an item of
equipment is declared to comply with one of its recommendations.
PREFACE
This standard has been prepared by IEC Technical Committee No. 78:
Tools for live working.
The text of this publication is based upon the following documents:
Six Months' Rule Reports on Voting
78(CO)24 + 24A 78(C0)26 + 26A
Full information on the voting for the approval of this standard can be
found in the Voting Reports indicated in the above table.
The following IEC publications are quoted in this standard:
Publications Nos. 50(121) (1978): International Electrotechnical Voca-
bulary (IEV), Chapter 121: Electro-
magnetism.
50(151) (1978): Chapter 151: Electrical and magnetic
devices.
50(601) (1985): Chapter 601: Generation,-, transmission
and distribution of electricity -
General.
60-1•(1973): High-voltage test techniques, Part 1:
General definitions and test require-
ments.
212 (1971): Standard conditions for use prior to
and during the testing of solid
electrical insulating materials.
410 (1973): Sampling plans and procedures for
inspection by attributes.
707 (1981): Methods of test for the determination
of the flammability of solid electri-
cal insulating materials when exposed
to an igniting source.
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SIST EN 60984:2000
984 © IEC - 7'-
SLEEVES OF INSULATING MATERIAL FOR LIVE WORKING
1. Scope
This international standard is applicable to insulating sleeves for the
protection of workers from accidental contact with live electrical
conductors, apparatus or circuits.
1.1 Five classes of sleeve, differing in electrical characteristics, are
provided and designated as: Class 0, Class 1, Class 2, Class 3 and
Class 4.
1.2 Five categories of sleeve with different properties are provided,
related to the following: resistance to acid, resistance to oil,
resistance to ozone, combined resistance to oil and ozone, and also
resistance to extreme low temperature. These are designated as
Categories A, H, Z, S and C respectively.
1.3 Two styles of sleeve, differing in configuration, are provided and
designated as straight taper and curved elbow.
2. Definitions
For the purpose of this standard, the terms hereafter have the
following meanings:
Elastomer
A generic term that includes rubbers ; latex and elastomeric com-
pounds that may be natural or synthetic, or a mixture, or a
combination of both.
Type test
A test of one or more devices made to a certain design to show that
the design meets certain specifications. (IEV* 151-04-15).
Routine test
A test to which each individual device is subjected during or after
manufacture to ascertain whether it complies with certain criteria
(1 EV 151-04-16) .
See the International Electrotechnical Vocabulary (IEV) (IEC
Publication 50).
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SIST EN 60984:2000
984 ©IEC - 9 -
Sampling test
A test on a number of devices taken at random from a batch.
(IEV 151-04-17).
Acceptance test
A contractual test to prove to the customer that the device meets
certain conditions of its specification (IEV 151-04-20) .
Shoulder roll
The rolled or reinforced edge of an insulating sleeve nearest to the
shoulder.
Cuff roll
The roll or reinforced edge of a sleeve at the cuff.
Electrical puncture
A disruptive breakdown through a solid insulant (IEV. 121-03-13).
Flashover
An arc by-passing an insulating body (IEV 121-03-14).
Nominal voltage
A suitable approximate value of voltage used to designate or identify
a system (IEV 601-01-21) .
3. Composition
The sleeves shall be manufactured of elastomers and produced by
a seamless process. The holes provided in sleeves, for the purposes of
strap or harness attachments, shall have non-metallic reinforced edges,
and shall be nominally 8 mm in diameter.
4. Classification
The sleeves covered under this standard shall be designated as
follows:
- by class as Class 0, Class 1, Class 2, Class 3 and Class 4;
by special properties, by the addition of a suffix as shown in
table I;
- by style as described in Sub-clause 4.1.1.
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SIST EN 60984:2000
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984 © IEC
Table
Special properties
Category, Resistant to
A Acid
H Oil
Z Ozone
S* Oil and ozone
C Extreme low temperature
Category S combines the characteristics of Categories H and Z.
Note.- Guidance as to use in relation to nominal voltage of a system
is given in Appendix A.
4.1.1 Style: Two styles are provided as indicated:
Style A: Straight taper (see figure 1) .
- Style B: Curved elbow (see figure 2).
Physical requirements
Shape
5.1
5.1.1 The shape of the straight taper sleeve is indicated in figure 1.
5.1.2 The shape of the curved elbow sleeve is indicated in figure 2.
5.2 Dimensions
5.2.1 Dimensions and tolerances are indicated in table II.
Table II
Dimensions*
Dimensions
(mm)
Style Size
B C D
Small 630 370 270 140'
Style A (Figure 1) Medium 670 410 290 140
(Straight taper) Large 720 450 330 175.
Extra large 760 500 340 175
Small 630 370 290 145
Style B (Figure 2) Medium 670 410 310 145
(Curved elbow) Large 710 420 330 175
Extra large 750 460 330 180
Tolerances shall be as follows
Dimension A: ±15 mm;
Dimension B: ±15 mm;
C: mm;
Dimension #15
Dimension D: t 5 mm.
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SIST EN 60984:2000
984 © IEC - 13 -
5.2.2 Straight taper and curved elbow sleeves: The dimensions are shown
in figures 1 and 2.
5.2.3 To minimize problems of marking and identification, the following
standard abbreviations may be used:
small (S), medium (M), large (LG), extra large (XLG).
Class 0, Class 1, Class 2, Class 3 and Class 4, right or left shall
not be abbreviated (see Sub-clause 5.5) .
5.3
Thickness
5.3.1 The
maximum thickness of the elastomer on the flat surface (not
ribbed area, if present) of a sleeve shall be as follows in order to
obtain appropriate flexibility.
Table Ill
Maximum elastomer thickness
Class mm
0 1.00
1 1.50
2 2.50
3 2.90
4 3.60
5.3.2 The
minimum thickness shall be determined only by the ability to
pass the
tests defined in Clauses 6 and 7.
5.3.3 Sleeves of Categories A, H, and Z may require additional thickness
which shall not exceed 0.6 mm.
5.4 Workmanship and finish
Sleeves shall be free on both inner and outer surfaces from harmful
physical irregularities that can be detected by thorough test and
inspection.
Harmful physical irregularities shall be defined as any feature that
disrupts the uniform, smooth surface contour, such as pinholes,
cracks, blisters, cuts, conductive embedded foreign matter, creases,
pinch marks, voids (entrapped air), prominent ripples and prominent
mould marks.
Non-harmful physical irregularities shall be defined as surface
irregularities present on the inner and outer surfaces of the sleeve
due to imperfections on forms or moulds or other imperfections
inherent in the manufacturing process. These irregularities appear as
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SIST EN 60984:2000
984©IEC -15-
mould marks that look like cuts even though they are actually raised
ridges of elastomer, indentations, or protuberances that are acceptable
provided that:
a) the depression is not larger than 1.6 mm in diameter, has rounded
edges and no visible break in the surface, and cannot be seen on
the opposite side when stretched over the thumb;
b) there are not more than five depressions as described in a) any-
where on the sleeve and any two are separated by at least 15 mm;
c) the indentations, protuberances or mould marks tend to blend into
a smooth surface upon stretching of the material;
d) the small projections or protuberances represent only a small
amount of excess elastomer that cannot be readily removed with th e .
finger and these projections do not appreciably affect the stretch-
ing of the elastomer.
5.5 Marking
5.5.1 Each sleeve which is_ claimed to comply with the requirements of this
standard shall be marked with the following (see figure 3 and Sub-
clause 5.2.3) :
a) symbol (double triangle);
b) name, trade mark, or identification of the manufacturer;
c) category if applicable;
d) size;
e) class;
right or left;
g) month and year of manufacture.
In addition, each sleeve shall have a group of rectangles or other
suitable means to identify when the sleeve was put into service and
the dates of periodic inspection and testing.
5.5.2 The marking shall be durable and shall not impair the quality of the
sleeve.
The durability of the marking is checked by rubbing the marking for
15 s with a piece of lint-free cloth soaked in soapy water and then
rubbing it for a further 15 s with a piece of lint-free cloth soaked in
petrol (gasoline) . At the end of the test, the marking must remain
legible.
5.5.3 Any additional marking shall be subject to agreement between the
manufacturer and the customer.
5.5.4 When a colour code is used the colour of the symbol (double
triangle) shall correspond to the following code:
Class 0: red
Class 1: white
Class 2: yellow
Class 3: green
Class 4: orange
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SIST EN 60984:2000
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984©IEC
5.6 Packaging
Each pair of sleeves (right and left) shall be packaged in an indi-
vidual container or package of sufficient strength to properly protect
the sleeves from damage. The outside of the container or package shall
be marked with the name of the manufacturer or supplier, classifica-
tion, category, size, length, and style.
At the request of the customer, information contained in Appendix G
and any additional or amended instructions shall be included in the
package.
6. Tests on sleeves
General
6.1
There are four categories of tests: type, routine, sampling and
acceptance. These are defined in Clause 2: Definitions.
The allotment of these sleeves in various testing lots, the size of
each lot, and the order in which these tests are carried out are given
in Appendix C.
Each of the following sub-clauses defines whether type, routine or
sampling tests are required.
In order to carry out the type tests, it is necessary to have:
8 sleeves to cover all tests common to all categories of sleeves
(Clause 6);
- 4 additional sleeves of Category A;
- 4 additional sleeves of Category H;
- 4 additional sleeves of Category Z;
5 additional sleeves of Category S.
Sleeves shall be pre-conditioned for a period of 2 ± 0.5 h at a
temperature of 23 ± 2 °C and 50 ± 5% (see IEC Publication 212,
standard atmosphere B).
6.2 Visual inspection and measurements
6.2.1 Shape
Type test and sampling test (see Sub-clause 5.1) .
The shape shall be verified by visual inspection.
of sleeves should be uniform as this is significant in the
The taper
use of dry-form electrical testing.
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SIST EN 60984:2000
984 © IEC - 19 -
6.2.2 Dimensions
Type test and sampling test (see Sub-clause 5.2 and figures 1
and 2) .
6.2.2.1 Straight taper sleeves
Dimensions of straight taper sleeves, as illustrated in figure 1, shall
be determined with the sleeve in a flat condition (that is, with one
side firmly and uniformly pressed against the other). A convenient
device for measuring is a board with a centre line upon which the
sleeve is placed so that D 1 equals D 2 and E 1 equals E 2 , in which case
C 1 will be greater than C2.
Dimension A - The overall length shall be measured from the
outside edge of the wrist opening to the outside edge of the
shoulder opening, parallel to the centre line.
Dimension B - The underarm length shall be measured from the
outside edge of the cuff opening to the lowest point of the under-
arm opening along the centre line.
- Dimension C - The shoulder opening width shall be the sum of C1
and C 2 , minus twice the thickness of the sleeve, measured perpen-
dicular to the centre line as shown in figure 1.
- Dimension D - The wrist opening width shall be the sum of D 1 and
D 2 , minus twice the thickness of the sleeve, measured perpen-
dicular to the centre line as shown in figure 1.
6.2.2.2 Curved
elbow sleeves
Dimensions of curved elbow sleeves, as illustrated in figure 2, shall
be determined with the sleeve in a flat condition (that is, with one
side firmly and uniformly pressed against the other) . The sleeve shall
be oriented along a line from the midpoint of the wrist opening
through the centre of the uppermost button hole.
- Dimension A - The overall length shall be measured from the
outside edge at the midpoint of the wrist opening to the outside
edge of the shoulder opening, parallel to the orientation line.
- Dimension B - The underarm length shall be measured from the
outside edge at the midpoint of the wrist opening to the lowest
point of the shoulder, parallel to the orientation line.
- Dimension C - The shoulder opening width shall be measured as
the maximum width at the shoulder opening minus twice the sleeve
thickness.
Dimension D - The wrist opening width shall be measured as the
outside width above the reinforcing edge at the wrist opening,
minus twice the sleeve thickness.
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SIST EN 60984:2000
984 © IEC - 21 -
6.2.3 Thickness
Type test and sampling test (see Sub-clause 5.3) .
Thickness measurements shall be made at eight or more points uni-
formly distributed over the total area of the sleeve.
Measurements shall be made with a micrometer (see figure 4) or any
alternative instrument giving substantially the same results. The
micrometer shall be graduated to within 0.02 mm, have an anvil of
6 mm in diameter, and a presser foot 3.17 ± 0.25 mm in diameter. The
presser foot shall exert a total force of 0.83 ± 0.03 N. Sufficient
support shall be given the sleeve so that it will present an unstressed
flat surface between the anvil faces of the micrometer.
In case of dispute, the micrometer method described above shall be
used.
6.2.4 Workmanship and finish
Type test and sampling test (see Sub-clause 5.4) .
The workmanship and finish shall be verified by visual inspection.
6.2.5 Marking
Type test and routine test (see Sub-clause 5.5) .
The marking shall be verified by visual inspection and durability
test (see Sub-clause 5.5.2) for type tests. No durability test is
required for routine tests.
6.2.6 Packaging
Type test and sampling test (see Sub-clause 5.6) .
The packaging shall be verified by visual inspection.
6.3 Mechanical tests
6.3.1
General
All mechanical tests shall be performed on test pieces which have
been conditioned by storing each sleeve separately in a horizontal
position for 24 h at a room temperature of 23 ± 2 °C, 50 ± 5% relative
humidity (see IEC Publication 212, standard atmosphere B).
Note.-
The properties of vulcanized elastomeric materials change
continuously with time, these changes being particularly rapid
in the period immediately following vulcanization.
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SIST EN 60984:2000
984 © I EC - 23 -
6.3.2 Tensile strength and elongation at break
Type test and sampling test.
Four dumb-bell test pieces each having the outline shown in figure 5
shall be cut from the sleeve under test, one from the outer and one
from the inner part of the sleeve at each end.
Reference lines, 20 mm apart, shall be marked on these test pieces,
symmetrically placed on the narrow part of the dumb-bell (see
figure 5) .
The test pieces shall be tested in a tensile testing machine which
shall be power driven at a sufficient speed to maintain the rate of
traverse of the driven grip at 500 ± 50 mm/min up to the maximum
force capacity of the machine.
The tensile strength shall be calculated by dividing the force at
break by the initial area of the cross section under test. The average
of the four test pieces shall not be less than 14 MPa..
The elongation at break shall be calculated by subtracting the initial
distance between the reference lines on the test piece from the
distance between the lines at breaking point and expressing the result
as a percentage of the initial distance.
The average of the four test pieces shall not be less than 600%.
Notes 1.- The machine shall be equipped to give a continuous indic-
ation of the force applied to the test piece and a
graduated scale to measure the elongation.
After the test piece has been broken, the machine shall
2.-
give a permanent indication of the maximum force and where
possible the maximum elongation.
6.3.3 Mechanical puncture resistance
Type test and sampling test.
Two circular test pieces 50 mm in diameter shall be cut from the
sleeve and each shall be clamped between two flat 50 mm diameter test
plates. The top plate shall have a circular opening 6 mm in diameter
and the bottom plate a 25 mm diameter circular opening. The edges of
both openings shall be rounded to a radius of 0.8 mm (see figure 6).
A needle shall be produced from 5 mm diameter metal rod and one
end shall be machined to produce a taper with an included angle of 12°
and with the tip rounded to a radius of 0.8 mm (see figure 6) . The
needle shall be clean at time of use.
---------------------- Page: 22 ----------------------
SIST EN 60984:2000
984 ©IEC - 25 -
The needle shall be positioned perpendicularly above the test piece
(clamped between the plates) and shall be driven into and through the
test-piece. The rate of traverse shall be 500 ± 50 mm/min . The force
required to puncture the test-piece shall be measured.
The puncture resistance shall be calculated by dividing the punc-
turing force by the thickness of the test-piece and for each test the
result shall be greater than 18 N/mm.
6.3.4 Tension set
Type test and sampling test.
Three test pieces, having the outline shown in figure 5 shall be cut
from each sleeve under test, one from each side near the wrist end
and one from near the underarm end. The test pieces shall be fitted in
a straining device consisting of a metal rod or other suitable guide
fitted with a pair of holders, one fixed and one movable for the ends
of the test piece. The measurement of the unstrained reference length
(shown as / in figure 5) shall be checked to the nearest 0.1 mm and
the test-piecé shall be placed in the holder. The test-piece shall be
extended at a speed of between mm/s and 10 mm/s to a 400 ± 10%
elongation and held for. 10.0 min. After this time the strain shall be
released at a speed of between 2 mm/s and 10 mm/s, and then the test
piece shall be removed from the holders and laid free on a flat
surface. After a 10.0 min recovery time the reference length shall be
measured again.
The tension set is calculated as a percentage of the initial strain as
follows:
/l - /o
tension set = 100 X
/s -
where:
I o = original unstrained reference length
Is = strained reference length
I l = reference length after recovery
The tension set shall not exceed 15%.
6.4 Dielectric tests
6.4.1 General
Dielectric testing at a.c. or d.c. voltage shall be carried out on
three sleeves and at a temperature of 23 ± 2 °C. The choice of a.c. or
d.c. shall be made between the manufacturer and customer.
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SIST EN 60984:2000
984 © IEC - 27 -
For type and sampling tests the sleeves shall be conditioned for
moisture absorption by immersion in water for a period of 16 ± 0.5 h.
For routine tests such conditioning is not required.
All dielectric tests shall be performed on sleeves right side out.
Four methods of mounting sleeves are provided, with test limitations on
some of the methods. Electrode to electrode clearances shall be as
specified in table IV.
Note.- Both a.c. and d.c. test procedures are included in the follow-
ing sub-clauses. It is intended that one mounting method and
one testing procedure be selected for the electrical acceptance
test.
Table IV
Clearance between electrodes
Clearance
Class
of A.C. D.C.
sleeve
mm mm
0 80 80
1 80 100
2 130 150
3 180 200
4 260 260
Clearance is the shortest electrical path from electrode to electrode
around the open edge of the sleeve. Permissible tolerance
is ±25 mm.
b) In those cases where atmospheric conditions make the specified
clearances impractical, the clearance may be increased by a
maximum of 50 mm.
6.4.2 Electrodes
Four methods of mounting sleeves are provided, with the mounting
positions and electrodes employed as described as follows:
Note.- Water electrodes should be free of air bubbles and air pockets,
particularly in contact with the sleeves. Other electrodes
should fit sleeves as snugly as possible and without distor-
tion. Areas not in contact with the electrodes should be dry.
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SIST EN 60984:2000
984 IE C - 29 -
6.4.2.1 Water electrodes, inverted mounting
The small end of the sleeve shall be inverted and pulled through to
the large end to form an annular trough as shown in cross section in
figure 7. The sleeve shall be immersed in water and the trough filled
with water until the levels both inside and outside the trough are the
same. This mounting shall not be used above 20 kV a.c. or 30 kV d.c.
Note.- Particular care should be taken to avoid any sharp folds in the
sleeve, which may cause premature dielectric breakdown at these
points.
6.4.2.2 Water electrodes, sling mounted
A roll or rod of non-conductive material having a specific gravity
heavier than water and a diameter larger or equal to 40 mm shall be
placed across the sleeve at about the midpoint between the cuff and
underarm edge. The sleeve shall be immersed in water with the roll in
place and filled with water until the water levels are the same both
inside and outside the sleeve, and the cuff and underarm edges are
equidistant above the water line as shown in figure 8.
6.4.2.3 Water electrodes, straight mounting
A layer of dielectric liquid having a high dielectric strength, with a
specific gravity greater than 1.0 and insoluble in water, shall be
placed in the test tank to a depth of approximately 100 mm. The tank
shall then
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