~. E 7 E CENELEC

. ~.

E 3404583 00352bï 7 E '- 7-

CENELEC Rus de Stassart. 35 - 1050 Bruxsllsa

Teletex 206 2210097 - CENCEL - Tn 172210097 T&.: (+ 32 2) 519.68.71 - F a : (+ 32 2) 519.69.19

INFORMATION SHEET

I Issue 1 1992-05-13

HO 22.2 S2 Reprint incorporating A1 to A4 May 1992

Rubber insulated cables of rated voltages up to and including 4501750 V Part 2: Test methods

Conducteurs et câbles isolks au caoutchouc, de tension assignee au plus égale a 4 5 0 1 7 5 0 V Deuxième partie: Méthodes d'essais

Isolierte Starkstromleitungen mit einer Isolierung aus Gummi mit Nennspannungen bis 4501750 V Teil 2: Prüfverfahren

RO: IEC 245-2:1980

Related to Directive: 73123lEEC

This. Harmonization Oocument consists of the following:

- Title Page - Text prepared by CENELEC technical cornittee TC 20

date of ratification : 1991-09-23 date of announcement : 1992-07-01

date o f withdrawal : 1993-01-01 date of latest publication : 1993-01-01

LIST OF NATIONAL STANDARDS IS GIVEN OVERLEAF

S 3404583 0035270 3 I ~~~ ~

H A R M O N I Z E D NATIONAL STANDAROS HO 2 2 . 2 S 2 : 1 9 9 2

A T : OVE-K70, OVE-40 ( 1 9 9 1 )

BE : NBN 3 2 - 1 3 1 ( 1 9 8 7 )

CH : SEVIASE 1 0 8 2 . 1 9 8 6

DE : D I N VOE 0 2 0 7 T e i l 2 0 1 0 7 . 8 2 : D I N VDE OC72 T e i l 1 1 0 6 . 8 7 : D I N VDE 0 4 7 2 Teil 3 0 3 / 0 6 , 8 3 : D I N VOE 0 4 7 2 Tei l 4 0 1 1 0 6 . û C ; D I N VOE 0 4 7 2 Teil 4 0 2 1 0 5 . 8 4 ; D I N VOE OC72 T e i l 5 0 1 1 0 4 . 6 3 ; D I N VOE OC72 T e i l 5 0 6 1 0 5 . 8 6 ; OIN VOE O472 Tei l 6 0 2 ) 0 8 , 8 3 ; D I N V D E OC72 Teil 6 0 3 / 1 1 . 8 3 ; O I N VOE 0 4 7 2 Teil 6 0 5 1 0 1 . 8 5 ; D I N VOE 0 4 7 2 T e i l 6 0 6 / 0 8 . 8 3 : D I N VOE 0 4 7 2 Tei l 6 2 5 1 0 1 . 8 3 ; D I N VDE 0 4 7 2 T e i l 8 0 4 / 0 8 . 8 3

OK : NR ( S R 3 7 - 2 1

ES : UNE 2 1 - 0 2 7 - 9 1 Parte 2

F I : E HO 2 2 . S 2 - 8 4

FR : NF C 3 2 - 1 0 2 ( 1 9 8 4 )

G B : 8 s 6 0 0 7 : 1 9 8 3 ; 8 s 6 3 6 0 : 1 9 8 1 ; BS 6 4 6 9 : 1 9 8 4 ; B S 6 5 0 0 : 1 9 8 4

GR : E L O T 6 2 3 . 2 - 1 9 8 7

I € :

IS : I S T L 1 0 4 : 1 9 9 1

I T : C E 1 2 0 - 1 9 ( 1 9 9 0 )

LU : NOS

NL : NEN 3 6 2 2 1 1 9 8 4 )

NO : NEMKO 1 8 1 . 2 / 8 4

SE : S S 4 2 4 0 2 3 5 - 2 ( 1 9 8 5 )

NOS No standard SP Standard i n preparation NR Standard under rev i s ion

HARMONIZATION DOCUMENT HD 22.2 S2 DOCUMENT D’HARMONISATION

HARMONISIERUNGSDOKUMENT May 1992

Reprint incorporating A I to A4

UDC 621.31 5.21 1.2.027.475.001.4 ,

Descriptors: Conductor, cable, flexible cable, rigld cable, single core cable, milticore cable, conductor materlai, flat cable, compound, polychloroprene, rubber, elastomer, insulation compound, type test sample test, mutine test, nominal voltage, mark, common marking, identification, cdour scheme, consirudon, insulation, separator, filler, sheath, braid, Inner layer, outer layer, thickness, man value, specified value, electrical resistance, test, tensile strength, elongation at break, ageing, air oven, oxygen bomb, hot set, complete cable, overall dlmensions, bending, ñexlng, voltage test, absence of short circuits, spark (test), insulation resistance, wear resistance, test (under) fire (conditions), gukle to use, solderatilily test

English version

Rubber insulated cables of rated voltages up to and including 450í750 V

Part 2: Test methods ( I EC 245-2: 1 980, modified)

Conducteurs de câbles isolés au caoutchouc de tension assignée au plus égale à 450íï50 V Deuxième partie: Méthodes d’essais . Teil 2: Prüfverfahren (CE1 245-2:l 980, modifiée)

Isolierte Starkstromleitungen mit einer Isolierung aus Gummi mit Nennspannungen bis 450íï50 V

(IEC 245-2:i 980, modifiziert)

This Harmonization Document was approved by CENELEC on 23 September 1991. CENELEC members are bound to comply with the CEWCENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document on a national level. Up-to-date lists and bibliographical references concerning national implementation may be obtained on application to the Central Secretariat or to any CENELEC member. This Harmonization Document exists in three official versions (English, French, German). CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netheriands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

CENELEC European Committee for Electrotechnical Standardization

Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

Centrai Secretariat: rue de Sîassart 35, B - 1 O50 Brussels

O 1992 Copyright reserved to CENELEC members

~~~~

Ref. No. HD 22.2 S2:1992 E

81 3404583 0835272 7

Page 2 HD22.2 S2 - REPRINT 1992

I

?

1

FOR E WO R D

HD22 was originally adopted by CENELEC on 9th July 1975,

Edition 2 of HD22 was implemented on 1 st January 1984, and a t that time contained 4 parts.

Since 1984, new parts have been published, original parts amended, and in addition HD 505 has superseded HD 385 as the cross-reference for test methods,

This reprint of the 4 parts of Edition 4 of HD22 incorporates all ratified amendments and the change to HD 505.

The new parts of HD22, which are Edition 1 versions, already incorporate the change to HD 505 and are being updated as appropriate.

HD22 now has the following parts:

HD22.1 S2 - General requirements (with AM1 to AM10 inclusive) HD22.2 S2 - Test methods (with AM1 to AM4 inclusive) HD22.3 S2 - HD22.4 S2 - HD22.5 - (Spare) HD22.6 S1 - Arc welding cables HD22.7 S1

HD22.8 S1

Heat resistant silicone rubber insulated cables (with AM1) Cords and flexible Cables (with AM1 to AM5 inclusive)

- -

Cables with increased heat resistance for internal wiring for a conductor temperature of 110% Polychloroprene or equivalent synthetic elastomer sheathed cable for use as decorative chains (AM11

This Edition 2 of part 2 of HD22 now incorporates:

AM1 - dop 1990-06-01 AM2 - dûp 1990-1 2-01 AM3 - dûp 1991-06-15 AM4 - dop 1993-01-01

In accordance with the guidance given by CENELEC the dop for this Reprint is 1999-01-01.

References are made, in this Part 2'of HD22, to other Parts of this HD and to other Harmonisation Documents and International Standards as follows:

HD 405.1 Tests on electric cables under fire conditions. Part 1: Test on a single vertical cable (Endorsing IEC 332-1)

HD 505 Common test methods for insulating and sheathing materials of electric cables (Endorsing IEC 81 1)

IEC695-2-2 Fire hazard testing : Needle flame test

In all cases a reference to another HD implies the latest edition of that document.

1.

2.

3.

4.

5.

6.

7.

CI 3404583 0035273 9 W


CONTENTS

- PAGE

General 1.1 Scope 1.2 Applicable tests 1.3 1.4 Sampling 1.5 Pre-conditioning 1.6 Test temperature 1.7 Test voltage 1.8 1.9 Measurement of insulation thickness ,

1 .l O 1.1 1 1.12

Classification of tests according to the frequency with which they are carried out

Checking of the durability of colours and markings

Measurement of sheath thickness Measurement of overall dimensions and ovality Solderability tests for untinned conductors

Electrical tests 2.1 Electrical resistance of conductors 2.2 2.3 Voltage test on cores 2.4 Insulation resistance 2.5 Spare 2.6 2.7 Surface resistance of sheath

Voltage test on completed cables

Test to check the absence of faults on insulation

Tests of mechanical strength of completed flexible cables 3.1 Flexing test 3.2 Static flexibility test . 3.3 Wear resistance test

(Spare)

Test for resistance to hot particles

Hot set test for insulation and sheath

Ozone resistance test 7.1 General 7.2 Method of test 7.3 Method B

Appendix 1 Procedure for checking the efficacy of the method of spark testing

4 4 4 4 4 4 5 5 5 6 6 7

10 1 1

1 1 15 17

18

19

19 19 19

22

E 3404583 0035274 O E


RUBBER INSULATED CABLES OF RATED VOLTAGES UP TO AND INCLUDING 450/750V

Part 2 : Test Methods

1. General

1.1 ScoDe

HD22 applies to rigid and flexible cables with insulation and sheath, if any, based on vulcanised rubber, of rated voltages Uo/U up to and including 450/750V used in power installations of nominal voltage not exceeding 450/750V A.C.

This Part 2 specifies the methods of carrying out the tests specified in HD22 in conjunction with other Harmonisation Documents HD405 Part 1 and HD505. General Requirements are specified in HD22 Part 1,

Particular types of cable are specified in HD22 Part 3 onwards, and are hereafter referred to as "the particular specifications".

1.2 Amlicable Tests

The tests applicable to the types of cables are given in the particular specifications.

1.3 Classification of Tests accordina to the freauencv with which thev are carried out

The tests specified are type tests (Symbol T) and/or sample tests (Symbol S) and/or routine tests (Symbol R ) as defined in Part 1, Sub-clause 2.2, The Symbols T, S and R are used in the relevant tables of the particular specifications.

1.4 Samding

if a marking is indented in the insulation or sheath, the samples used for the tests shall be taken so as to include such marking.

For multicore cables, except for the test specified in Part 2 Sub-clause 1.9, not more than three cores (of different colours, if available) shall be tested unless otherwise specified.

1.5 Pre-conditioning

All the tests shall be carried out not less than 16 h after the vulcanization of the insulating or sheathing compounds.

1.6 Test TemDeraturQ

Unless otherwise specified, tests shall be made at ambient temperature.

= 3404583 0035275 2 - ~ ~~ ~.


1.7 Test Voitaag

Unless otherwise specified, the test voltages shall be A.C. 49Hz to 61 Hz of approximately sine- wave form, the ratio peak value/r.m.s. value being equal t o f i w i t h a tolerance of 7%

The values quoted are r.m.s. values.

1,8 Checkina of the Durabilitv of colours and markinas

Compliance with this requirement shall be checked by trying to remove the marking of the manufacturer's name or trademark and the colours of cores or numerals by rubbing lightly ten times with a piece of cotton wool or cloth soaked in water.

1.9 Measurement of Insulation Thickness

1.9.1 Procedurg

The thickness of insulation shall be measured in accordance with Sub- clause 8.1 of HD505.1.1. One sample of cable shall be taken from each of three places, separated by at least lrn.

Compliance shall be checked on each core of cable.

If withdrawal of the conductor is difficult, it shall be stretched in a tensile machine or the piece of core shall be immersed in mercury until the insulation becomes loose.

1.9.2 Evaluation of results

The mean of the 18 values (expressed in millimetres) obtained from the three pieces of insulation from each core shall be calculated to two decimal places and rounded off as given below, and this shall be taken as the mean value of the thickness of insulation.

If in the calculation the second decimal figure is 5 or more, the first decimal figure shall be raised to the next number; thus for example, 1.74 shall be rounded to 1.7 and 1.75 to 1.8.

The lowest of all values obtained shall be taken as the minimum thickness of insulation at any place.

This test may be combined with any other measurements of thickness, for instance those of Part 1, Sub-clause 5.2.4.

34t34583 O035276 4 0 I


1.1 O Measurement of Sheath Thickness

1.10.1

1 *10.2

Procedure

The thickness of the sheath for circular cables shall be measured in accordance with Sub-clause 8.2 of HD505.1.1.

One sample of cable shall be taken from each of three places, separated by at least 1 m.

Evaluation of resulta

The mean of all the values (expressed in millimetres) obtained from the three pieces of sheath shall be calculated to two decimal places and rounded off as given below, and this shall be taken as the mean value of the thickness of sheath.

If in the calculation the second decimal figure is 5 or more, the first decimal figure shall be raised to the next number; thus for example, 1.74 shall be rounded to 1.7 and 1.75 to 1,8.

The lowest of all values obtained shall be taken as the minimum thickness of sheath a t any place.

This test may be combined with any other measurements of thickness, for instance those of Part 1, Sub-clause 5.54.

1.1 1 Measurement of Overall Dimensions and Ovality .

The three samples taken in accordance with Part 2, Sub-clause 1.9 or 1.1 O shall be used.

The measurement of the overall diameter of any circular cable and of the overall dimensions of flat cables with a major dimension not exceeding 15mm shall be carried out in accordance with Sub-clause 8.3 of HD505,l. 1.

For the measurement of flat cables with a major dimension exceeding 15mm, a micrometer, a profile projector or similar equipment shall be used.

The mean of the values obtained shall be taken as the mean overall dimensions.

For checking the ovality of circular sheathed cables, two measurements shall be made a t the same cross-section of the cable, covering the maximum and minimum values.

3404583 0035277 b


1 .12 Solderabilitv test for untinned conductora

1.1 2.1 Aim of the test

The test is intended to assess possible interaction between insulation and bare copper conductor.

1.12.2 Pre-selection of samdea

The test shall not be carried out until the normal ageing test in the air oven has been completed.

When the normal ageing test in the air oven has been completed, the conductors of the test samples shall be examined. If there is no blackening of the conductors no further action is required.

If the conductors are blackened, the normal ageing test in the air oven shall be repeated on new samples, except that the ageing conditions shall be seven days a t (70 f a°C. At the end of this ageing period the conductors shall be examined, and if there is no blackening no further action is required.

If the conductors are blackened, carry out the test described in 1.1 2.3 to 1.1 2.6 below.

1.1 2.3 Selection of samdes and meDaration of test Dieces

1.12.3.1 One sample having a length suitable for the bending test defined below is taken at three points in the cable, and the cores in each sample are carefully separated from all other components.

1.1 2.3.2 Each sample of core thus obtained is wound, in three turns, on a mandrel, the diameter of which is three times that of the core.

The sample is then unwound and straightened out, whereupon it is wound again in such a way that the fibre which was compressed to the first case becomes the stretched fibre in the second.

This cycle of operations is repeated two more times, which represents three bending operations in one direction and three in the other.

1.1 2.3.3 From each sample of core which has been straightened out after the third cycle of bending operations, a test piece having a length of about 15 cm is taken from that part of the core which has actually been wound.

Each test piece is then subjected to accelerated ageing in a hot-air oven for 168 h at a temperature of (70~2pC.

After this accelerated ageing, the test pieces are left at ambient temperature for at least 16 h.

Then each test piece is stripped at one end over a length of 60 mm and is subjected to the solderability test by the solder-bath method described below.

1.1 2.4 Descrimion of the solder bath

The solder bath shall have a volume sufficient to ensure that the temperature of the solder remains uniform at the moment when the conductor is introduced. It shall be provided with a device which maintains the temperature of the solder at(270+10)0C.

?age 8 HD22.2 S2 - REPRINT 1992

The height of the solder bath shall be a t least 75 mm,

The visible surface area of the bath shall be reduced as far as possible, by using a perforated plate of heat resisting material in order to protect the core against direct radiation from the bath.

The composition of the solder shall be tin (between 59.5% and 61 -5%) and lead. Impurities (as a percentage of the total mass) shall not exceed:

Antimony 0.50 Zinc 0.005 Bismuth 0.25 Aluminium 0.005 Copper 0.08 Others 0,080 Iron 0.02

1,12.5 Test Drocedurq

The surface of the solder bath shall be kept clean and shining.

After immersion for 1 O seconds at ambient temperature in a pickling bath constituted by a solution of zinc chloride in water (ZnCI being 10% of the total mass), the bared end of each test piece shall be immersed in the solder bath over a length of 50 mm in the direction of its longitudinal axis.

The speed of immersion is 2525 mm/s.

The duration of immersion is 5+0,5 s.

The speed of emergence is 2525 mmls.

An interval lasting 1 O s is observed from the start of one immersion to the start of a subsequent immersion. The number of immersions shall be 3,

1 ,12.6 Reauirement

The part of the conductor that has been immersed shall be adequately tinned.

2. Electrical Tests

2.1 Electrical Resistance of Conductors

In order to check the electrical resistance of conductors, the resistance of each conductor shall be measured on a sample of cable of at least 1 m in length, and the length of this sample shall be measured.


If necessary a correction to 2OoC and to a length of 1 km shall be obtained by the formula :

R&,-x- 2545 1000 234.5+t L

where : t = Temperature of the sample at the moment of measurement, in degrees Celsius R,, = Resistance a t 2OoC, in ohm/kilometre R, = Resistance of L metres of cable at toc in ohms L = Length of the sample of cable, in metres (length of the complete sample and not of

the individual cores or wires)

2.2 Voltaae test on CornDleted cables

A sample of cable as delivered shall be immersed in water. The length of the sample, the temperature of the water and the duration of immersion are given in Part 1, Table Ill.

A voltage shall be applied in turn between each conductor and all the others together, connected to the water and the metal central heart, if any; and then between all conductors together and the water connected to the metal central heart, if any.

The voltage and duration of its application are given for each case in Part 1, Table 111.

2.3 Voltaae Test on Cores

The test applies to sheathed or braided cables.

The test shall be made on a sample of cable of 5m length. The sheath or the overall braid and any other covering or filling shall be removed without damaging the cores.

The cores shall be immersed in water as specified in Patt 1, Table 111 and a voltage shall be applied between the conductors and the water.

The voltage and the duration of its application are given for each case in Part 1, Table Ill.

2.4 Insulation Resistance

This test method applies to cables or cores with maximum admissible conductor temperatures above 90OC.

The test shall be made on the same sample used for the voltage test.

A sample of 1.40 m length shall be cut from the cable or core to be tested. This sample shall be covered with a semi-conducting layer.

Over this layer a metal braid or a metal tape shall be applied in such a way as to obtain an active measuring length of 1 .O m.

At both ends of the active measuring lengths, leaving a gap of 1 mm wide, a protective wire binding of approximately 5 mm length shall be applied.

The sample shall-then be wound to a ring with a diameter qf approximately 15 D but a t least 0,20 m (D = nominal outer diameter of insulation).

3404583 0035280 b &

300/300 2000 5000 300/500 2000 5000 450/750 2500 5000 .

Page 10 HD22.2 S2 - REPRINT 1992 b

The samples shall be maintained in an air oven for a t least 2 h at the specified test temperature. The clearance between the sample and the walls of the air oven shall be a t least 5 cm.

After conditioning period a dx. voltage between 80V and 500V shall be applied between the conductor and the screen (semi-conducting layer and metal braid/metal tape including the protective wire binding), the sample still kept in the air oven.

The insulation resistance shall be measured 1 minute after application of the voltage and this value shall be related to 1 km,

None of the resulting values shall be below the minimum insulation resistance value prescribed in the relevant cable specifications.

2.5 (Spare)

2.6 Test to check the absence of faults on insulation

This test shall be carried out as a routine test in the final stage of manufacture either on delivery lengths or on manufacturing lengths before cutting them into delivery lengths.

The test shall be either, for single core cables, a spark test in accordance with Part 2, Sub- clause 2,6,1, or, for multicore cables, a voltage test in accordance with Part 2, Sub-clause 2,6.2.

2.6.1 %ark test

Test requirements : The cable shall withstand the test voltage specified below without failure of the insulation. The spark test equipment shall detect a puncture in the insulation having a diameter equal to or greater than half of the specified insulation thickness. The recovery time of the spark tester shall be not greater than 1 second.

Test voltage : The voltage applied by the spark tester may be power frequency a.c., d.c., high frequency or of other form.

The magnitude and the presence of the voltage shall be such that with the electrode system employed and at the speed employed for the passage of the cable through the spark tester the test requirements are effectively met.

The reference method to be used to establish the efficacy of the spark testing equipment is given in Part 2, Appendix 1 ,

2.6.2 Voltaae test

Test requirements : The cable in the dry state and at room temperature shall withstand the test voltage applied as specified below without failure of the insulation.

Test voltage : The voltage shall be either derived from an a.c. source complying with Part 2, Clause 1.7, or from a d.c. source.

The magnitude of the applied voltages shall be as follows:

Rated voltage U,/U of the cable,

Test Voltage, V

a.c. (r.m,s.) Not less than

~ -

3404583 003528L 8 ~- -

Page 1 1 HD22.2 S2 - REPRINT 1992

The voltage shall be applied between conductor and groups of conductors in such a way that the insulation on each core is tested against all adjacent cores and screen if any. The voltage shall be increased gradually and thereafter be maintained a t the full value for 5 min.

2.7 Surface resistance of sheath

This test relates to cable with sheaths made of EM2 or EM3 compounds. It is carried out on three samples of complete cable, each about 250 mm in length.

The sheath of each of the samples is cleaned with spirit, and two electrodes consisting of wire helices are applied at a distance of (i O0 2 2)mm from each other. For the helices, copper wire of between 0.2 and 0.6 mm diameter is used. After the wire has been applied, the surface of the sheath is again thoroughly cleaned between the electrodes.

The samples are then conditioned at a temperature of (2ü~@C, and a relative humidity of (65+5&, for 24 hours.

Immediately after removal from the conditioning chamber, a d.c. voltage of between 100 and 500 V is applied between the wire electrodes, and the resistance measured 1 minute after application of the voltage,

The measured resistance for each sample in ohms is then multiplied by a/lOO, where a is the circumference of the sheath of the sample in mm. The median of the three values so obtained is recorded as the surface resistance of the sheath, and shall not be lower than 10' ohms.

3. Tests of mechanical strenath of comoleted flexible cablea

3.1 Flexina test

, The requirements are given in Part 1, Sub-clause 5.6.3.1.

This test is not applicable to flexible cables with cores of nominal cross sectional area greater than 4mm2 and also not to cables having more than 18 cores laid up in more than two concentric layers.

The test shall be carried out by means of the apparatus shown in Part 2, Figure 1. This apparatus has a carrier C supporting two pulleys A and B arranged so that the cable is horizontal between the pulleys. The carrier makes a backward and forward movement over a distance of 1 m at an approximately constant speed of 0'33 m/s between each reversal of the direction of movement.

A sample of flexible cable about 5m long shall be stretched over the pulleys, as shown, Figure 1 , each end being loaded with a weight. The mass of this weight and the diameter of the pulleys A and 6 are shown in Table A.

The pulleys have a semi-circular shaped groove for circular cables and a flat groove for flat cables. The restraining clamps 0 shall be fixed so that the pull is always applied by the weight from which the carrier is moving away.

The carrier makes backward and forward movements.

During the flexing test cable samples having two up to and including five cores shall be loaded with the current specified in Table B as follows:

- 2 and 3 core cables : all cores to be loaded fully - 4 and 5 core cables : three cores to be loaded fully or all cores to be loaded according to the

following formula:

Page 12 H022.2 S2 - REPRINT 1992

where n = number of cores l3 = full current according to Table B

For the current loading either a low voltage or a voltage of 220/380 V may be used. On cores which are not loaded a signal current shall be applied.

Cables having more than five cores shall not be loaded.

After the required number of movements the sheath of the sample, if any, shall be removed. The cores shall then withstand the voltage test carried out in accordance with Part 2, sub- claiise 2.3, but with a test voltage not exceeding the value specified in Part 1, Sub-clause 5.6.3.1.

J

0.75

1 1.5 2.5 4


1 .o 80

1 .o 120 1 .o 120 1.5 120 2 .o 160

TABLE A : MASS OF WEIGHT AND DIAMETER OF PULLEYS

1 1.5 2.5 4

1 1.5 2.5 4

1 1,5 2.5 4

Types of flexible cable

1 .o 120 1.5 120 2.0 160 3.0 160

1.5 120 1.5 120 2.5 160 3.5 200

1.5 120 2.5 160 3.0 160 4.0 200

Ordinary tough rubber sheathed cord and flexible cable

1.5 2.5

1.5 2.5

1.5 2.5

Ordinary polychloroprene or other equivalent synthetic elastomer sheathed cord and flexible cable

~~

3.5 160 5.0 200

5.0 200 7.5 200

7.5 200 9.0 200

Heavy polychloroprene or other equivalent synthetic rubber sheathed flexible cable

Nominal cross sectional area

Current l3

Number of cores

mm2 0.5 0.75 1 1.5 2.5 4

A 3 6 10 16 25 32

2 or 3

2 up to 5

2

3

4

5

7

12

18

Nominal cross sectional area

(mm21

0.75 1 1.5

Mass of weight

1 .o

Diameter of pulleys

ímmi

80 80 80

I’) For core numbers above five and below 18 not given in Table A the pulley diameter shall be 200mm and the mass of weight shall be eight to 1 O times the weight of 1 m of the cable to be tested.

(*) Diameter measured at the lowest point of the groove

TABLE B : CURRENT LOADINCS


3 4 0 4 5 8 3 0035284 3 E

. . I

,

= 3404583 0035285 5 _ _ ~ ~~ -

120


under consideration

3.2 Static flexibilitv test*

A sample with a length of(3 kO.O$m shall be tested in an apparatus similar to that shown in figure 2. Two clamps, A and B, shall be located at a height of at least 1.5m above ground level.

Clamp A shall be fixed and clamp B shall move horizontally a t the level of clamp A.

The ends of the sample shall be clamped vertically (and remain vertical during the test), one end in clamp A, the other in the movable clamp B which shall be at a distance I = 0.20m from clamp A. The cable should take approximately the shape indicated by figure 2 (dotted lines).

. The movable clamp B shall then be moved away from the fixed clamp A until the loop formed by the cable takes the shape, indicated in Figure 2 by the heavy outline, of the U enclosed wholly between two plumb lines through the clamps and set up tangentially to the external generatrix of the cable, This test shall be done twice, the cable being turned in the clamp, after the first test, through 1 80°.

The mean of the two values of I' shall be measured between the two plumb lines. The required values are given below.

Nominal cross-sectional area Il mm

10 16 25 35 50 70 95

Maximum distance I', cm

45 45 45 50 50 55 60

This test will be reconsidered

W 3404583 O035286 7 H

t

Page 16 .HD22.2 S2 - REPRINT 1992

If the results of the test are unfavourable, the sample shall be pre-conditioned by winding it four times on and off a reel with a diameter approximately 20 times the outer diameter of the cable; in this case, the sample shall be turned each time through 90'. After this pre-conditioning the sample shall be subjected to the test described above and shall meet the specified requirements.

I I I I I I

/I 1 / j

/,' I

/ / / '

I I /

1 I I I

l I \ I

/ /

-- x L

3 m

- '//

Fig. 2 Static Flexibility Test

. Page 17 HD22.2 S2 - REPRINT 1992

3.3 Wear resistance testIll

The requirements are given in Parc 1 Sub-clause 5.6.3.2.

The test shall be made on three pairs of samples of flexible cable, each sample having a length of about 1 m.

In each pair one sample shall be wound so as to give nearly two turns on a fixed reel having a diameter of 40 mm a t the bottom of the groove as shown in Parc 2, Figure 3, the distance between the flanges of the reel being such that the turns are in close contact with each other, The sample shall then be fixed to prevent any movement relative to the reel.

The other sample shall be placed in the groove formed by the turns and a weight having a mass of 500 g shall be attached to one end.

The other end shall be moved up and down over a distance of O. 1 O m, at a rate of about 40 single strokes per minute.

I') A revision of this test is under consideration

Sample moving in the groovr betweon the turns of the fixed sample

sample

Fixed reei

- Weight

Fig. 3 - Arrangement for wear-resistance test. t

~- 6 3404583 0 0 3 5 2 8 8 - 0 -


4. (Spare)

5. Test of resistance to hot Dart idea

The covering of the cable shall be capable of withstanding the effects of a normal amount of hot particles without igniting or being completely' penentrated. To prove this the following test shall be made.

A device whose principle is shown in figure 4 enables a heated rod, in a horizontal position, to be applied with a given force to a contact point on the outer cover of the cable.

The rod shall be made of 18/8 chrome-nickel steel with a diameter of(2.51O.O$nm and a length of (l001O,$nm, An electric current of approximately 25A shall pass through the rod until a steady thermal state a t a temperature of $00, + 5, -0)oC is reached.

This temperature shall be measured by a contact thermometer or thermocouple and the temperature shall be maintained during the whole test period. The rod shall be applied to the outer cover of the cable with a force of (I .2, +O, -O.*.

100s after the rod has been applied to the cable, and a t 10s intervals until the end of the test, an attempt shall be made to ignite the gases emitted in the region of the contact point with a burner and flame complying with the requirements of clause 4 of IEC Publication 695-2-2. The test shall continue for two minutes.

When the test is carried out as specified above, the heated rod shall have penetrated into the covering so that it contacts the conductor of the cable. If the gases, emitted from the covering during the test, are flammable, the burning shall not continue for longer than 15s after the heated rod is removed.

After this test the cable shall then withstand the voltage test carried out in accordance with Part 2 Sub-clause 2.2. Test voltage: 1 OOOV.

18/8 chrome-nickel steel rod

rmcg - 100 +. 0.5 mm 4

Fig, 4 Device for testing resistance to hot particles

6.

7.


Hot set test for insulation and sheath

Two samples of cable shall be tested in accordance with Clause 9 of HD 505.2.1 both for insulation and sheath, ¡.e. taking two test pieces from each core and from the sheath. The test requirements are as specified in Part 1, Table I and Table II of .this HD.

Ozone resistance test

7.1

7.2

7,3

General

The test methods given hereafter are intended to check the ozone resistance of insulating and sheathing materials of electric cables.

Method of test

The ozone resistance test may be carried out according to one of the following methods:

A. According to HD 505.2.1, Clause 8 B. According to Clause 7.3 of this HD

Method B

7.3.1 Test amaratus and testina devices

7.3.1 ,l Suitable ozone test chamber with uniform ozone concentration.

7.3.1,2 Cutting device for preparation of test strips.

7.3.1,3 Clamping device according to Figure 5 or a similar device.

7.3.1 $4 Cylindrical mandrels consisting of wood or metal.

7.3.1 $5 Desiccator filled with silica gel or an equivalent material.

7.3.2 Selection and cuttina of test Dieces

Three test pieces of a t least 200mm length consisting of the complete core or cable shall be used whenever possible under the proviso however that any coverings over the insulation or the sheath to be tested have been removed, care being taken not to damage the insulation or the sheath. If it is impossible to use the complete core or cable, the insulation or sheath respectively shall be cut longitudinally and the required three test strips of at least 5mm but not more than 10mm width shall be punched by using the cutting device according to Sub-clause 7.3.1. The test pieces shall be ground or cut, so as to obtain test pieces of uniform thickness, care being taken to avoid undue heating. After grinding or cutting the thickness of pieces shall be not less than 0.8mm and not more than 2.0mm.

7.3.3 Conditionina and Preoaration of test Dieces

The test pieces shall be wiped with a clean cloth to remove dirt or moisture and stored in the desiccator according to Sub-clause 7.3.1 for at least 16h.

7.3.3.1 Test pieces consisting of the complete core or cable shall be wound around the mandrel according to Sub-clause 7.3.1. The diameter of the mandrel shall be (2 10.1) D (D : outer diameter of test piece). Both ends of the pieces shall be fixed on the mandrel in order to keep the windings in position.

E 3404583 0035230 9 I


7.3.3.2 Test strips shall be clamped on both ends in the clamping device according to Sub-clause 7.3'1 in such a way as to obtain a free length between the clamps of 1 OOmm. Subsequently the test pieces shall be elongated by (33 12)%.,

NOTE: To avoid possible ozone cracks near the clamps the test pieces may be covered locally by a suitable resistant lacquer.

7.3.4

7.3.5

Test Drocedu rQ

The required number of test pieces prepared according to Sub-clause 7.3.3 shall be placed substantially in the middle of the test chamber according to Sub-clause 7.3.1 so that each piece is at least 20mm from any other piece and exposed to the ozone concentration required.

The ozone concentration to be measured at the inlet of the test chamber and the other test conditions shall comply with the appropriate values for Method B in Part 1 of this HD.

The air with the required ozone concentration shall have a flow rate from 0.2 up to 0.5 times the chamber content per minute.

The test chamber shall be provided with a means to avoid laminar air flow along the test pieces.

Reauirements

After the specified test duration the test pieces shall be removed from the test chamber, and while still elongated, shall show no cracks when examined with a magnification of eight times.

Any cracks near the fixing point on the mandrel and/or near the clamps when using test strips shall be disregarded.

Page 21 H022.2 S2 - REPRINT 1992

œ c

I

C O o

a- - 8

A

? ?

I l

4 .p A

- - 06Z

c

E E

VI C O ul c .-

Q o > al U

.e

Ca C a. .e

- 5 o m O rc

al

C

- a

001 ..

.il 3404583 O035292 2 M


APPENDIX 1

Procedure for checkina the efficacv of the method of mark testing (With reference to Part 2, Sub-clause 2.6)

1 , Obiect

The object of this procedure is to standardise the method by which manufacturers may demonstrate that their spark testing method is effective in detecting faults in the insulation as specified in Part 2, Sub-clause 2.6.1.

The manufacturer's instructions for production and control procedures shall provide that cables for which spark testing is required shall be effectively tested in practice.

2. Procedure

2.1 Manufacturers should have available two test-lengths of cores which have been specially prepared. One of the cores should have the smallest insulation thickness for the relevant types of cable, the other core should have the largest insulation thickness for the relevant types of cable.

2.2 The preparation of the punctures in the insulation shall be effected as follows:

(a) The insulation shall be removed from the core for a length of about 5 times the nominal insulation thickness,

(b) From the piece of insulation which has been removed, a segment of about 30° shall be removed; the remaining piece of the insulation shall then be replaced on the conductor.

(c) Over the replaced piece of the insulation, one layer of adhering tape (esa, Polyethylene terephthalate) shall be placed in a longitudinal direction, with an overlap. This overlap shall be situated on the opposite side of the core to the position where the insulation was removed.

The layer shall have a length of at least ten times the nominal Insulation thickness.

(d) In this layer, in the middle of the place where the insulation has been removed, a hole in the tape shall be punched with a hot needle. The diameter of this hole shall be equal to half of the allowed minimum insulation thickness.

The other test piece shall be prepared in the same way.

2.3 The prepared test-pieces should then be passed through the spark test equipment at the highest speed for which the equipment is intended, the voltage applied between the electrode and the conductor being that normally used.

A fault shall be registered as each test piece is passed through the equipment.

= 3404583 0035293 4 W -


2.4 Method to check the recoverv time

At least two faults shall be passed through the spark-test equipment at its actual operating speed y (in metre per second), the distance in metres between two faults being not greater than the value of y.

. Ail the faults shall be registered by the equipment.

Date post:	21-Oct-2021
Category:	Documents
Upload:	others
View:	4 times
Download:	0 times