Iec 60332-3-24-2009.Pdf

IEC 60332 3 24 Edition 1 1 2009 02 INTERNATIONAL STANDARD NORME INTERNATIONALE Tests on electric and optical fibre cables under fire conditions – Part 3 24 Test for vertical flame spread of vertically[.]

General

The apparatus specified in IEC 60332-3-10 shall be used.

Ignition source

The ignition source shall be one ribbon-type propane gas burner as specified in

Test sample

The test sample shall comprise a number of test pieces of cable from the same production length, each having a minimum length of 3,5 m

The total number of test pieces in the test sample shall be that number required to provide a nominal total volume of non-metallic material of 1,5 l/m of test sample

The test sample shall be chosen within the limitations given in annex A

The test pieces forming the test sample shall be conditioned at a temperature of (20 ± 10) °C for at least 16 h before commencing the test The test pieces shall be dry.

Determination of the number of test pieces

In order to calculate the appropriate number of test pieces, it is necessary to determine the volume per metre of non-metallic material of one test piece

A cable measuring at least 0.3 meters is meticulously cut to ensure that its surfaces are perpendicular to the cable axis, allowing for accurate length measurements.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU.

The density of each non-metallic component, including cellular material, must be measured appropriately, as outlined in clause 8 of IEC 60811-1-3, to ensure values are expressed to two decimal places.

All non-metallic materials \( C_i \) in the test piece must be removed and weighed Non-metallic materials constituting less than 5% of the total non-metallic mass will be assumed to have a density of 1.0 kg/dm³.

Where semi-conducting screens cannot be removed from the insulating material, the components may be considered as one for the purpose of measuring their mass and density

The volume V i (litres per metre of cable) of each non-metallic material C i is calculated as follows: ×l i i i ρ

M i is the mass of the component C i (kg); ρi is the density of the component C i (kg/dm³); l is the length of the test piece of cable (m)

The total volume, V, of the non-metallic materials contained in 1 m of cable is equal to the sum of the individual volumes V 1 , V 2 , etc

To determine the closest integer for the number of test pieces to be mounted, divide the volume per meter specified in section 5.1 by the total volume, V, of non-metallic material per meter of cable If the result is 0.5 or above, round it up to the next whole number.

Mounting of the test sample

5.3.1 Cables having at least one conductor above 35 mm²

For cables with at least one conductor exceeding 35 mm², each test piece must be individually secured to each rung of the ladder using metal wire, either steel or copper For cables with a diameter of up to 50 mm, wire sizes should range from 0.5 mm.

1,0 mm in diameter For cables above 50 mm diameter, use wire between 1,0 mm and 1,5 mm in diameter

Test pieces must be affixed to the front of the standard ladder in a single layer, with a maximum total width of 300 mm Each test piece should be spaced 0.5 times the cable diameter apart, without exceeding 20 mm Additionally, a minimum distance must be maintained.

50 mm between the edge of the test sample and the inside of the ladder uprights

When mounting test pieces, position the first piece near the center of the ladder, then add additional pieces on both sides to ensure the entire array is approximately centered.

5.3.2 Cables having conductors 35 mm 2 and below and optical cables

For cables with conductors of 35 mm² or smaller, as well as optical cables, each test piece must be securely attached to each rung of the ladder using metal wire, either steel or copper, with a diameter ranging from 0.5 mm to 1.0 mm.

Test pieces must be affixed to the front of the standard ladder in a touching arrangement, with one or more layers, not exceeding a total width of 300 mm Additionally, a minimum distance must be maintained.

50 mm between the edge of the test sample and the inside of the ladder uprights

When positioning test pieces, the initial piece or array should be placed near the center of the ladder, with additional test pieces or arrays added symmetrically on both sides to ensure the test sample is approximately centered.

When additional layers of test pieces are needed after the initial layer has covered the full width of the ladder, the first test piece in the subsequent layer should be placed near the center of the ladder Additional test pieces should then be added symmetrically on both sides to ensure that the new layer is approximately centered on the ladder.

To create a test sample with a large number of test pieces, attach them in flat arrays of cables, with a maximum width of five pieces per rung of the ladder using the specified metal wire For consistency, it is advisable to secure adjacent cable arrays together at each rung to maintain contact between them.

Flame application time

The test flame will be applied for 20 minutes before being extinguished The airflow rate in the test chamber must be maintained until all cable burning or glowing has stopped, or for a maximum of 1 hour, after which any remaining burning or glowing of the cable will be extinguished.

After all cable burning or glowing has ceased or been extinguished, the test sample shall be wiped clean

Soot can be disregarded if the original surface remains undamaged after cleaning, and any softening or deformation of non-metallic materials is also not considered The flame spread is assessed by measuring the damage in meters, recorded to two decimal places, from the bottom edge of the burner to the point where char begins The onset of char is identified by pressing a sharp object, such as a knife blade, against the cable surface; a transition from a resilient to a brittle, crumbling surface signifies the onset of char.

For optimal performance, the specific requirements for each type or class of wire or cable should be outlined in their respective standards If such requirements are not specified, it is advisable to refer to the recommended performance criteria provided in Annex B.

In case of a disputed failure, two further tests shall be undertaken as detailed in clause 5 The test shall be deemed as satisfactory if both tests meet the stated requirement

The test report must provide a comprehensive overview, including a full description of the tested cable and its manufacturer It should specify the relevant standard used for testing, the number of test pieces, and the total volume of non-metallic material per meter of the test sample Additionally, the report must detail the mounting method (spaced or touching), the number of layers and test pieces in each layer, and the flame application time, typically set at 20 minutes It should also indicate the number of burners used, the extent of damage observed, and the time taken for all burning or glowing to extinguish.

Figure 1 – Spaced cables mounted on the front side of the standard ladder

1 Centre line of the ladder

Figure 2 – Touching cables mounted on the front side of the standard ladder

(arrays of cables in contact)

Guidance on cable selection for type approval testing

The choice of cable type and conductor cross-section for type approval testing shall be as given in the cable specification, or as agreed between purchaser and manufacturer

When selecting cables for testing, it is crucial to consider the limited capacity of the ladders and the conductor cross-section This ensures that the volume of non-metallic material fits within the specified mounting method.

IEC 60332 shall comply with the following:

• only the front face of the ladder shall be used;

For cables with a conductor cross-section exceeding 35 mm², the maximum number of cables allowed is limited to those required to create a single layer with a width of 300 mm Additionally, there must be a spacing of half the cable diameter between each cable, with a maximum spacing of 20 mm.

• for cables having a conductor cross-section of 35 mm 2 or smaller and optical cables, there is no restriction on cable selection;

• the minimum number of test pieces shall be two

A summary of all conditions for type approval testing to this part of IEC 60332 is given in table A.1

Table A.1 – Summary of test conditions

Range of conductor cross-sections (mm²) >35 a ≤ 35 b

Non-metallic volume per metre of test sample (l) 1,5 1,5

Use of standard ladder, maximum width of test sample

Positioning of test pieces Spaced Touching

Flame application time (min) 20 20 a At least one conductor greater than 35 mm² b No conductor cross-section exceeding 35 mm 2 or optical cable.

The maximum extent of the charred portion measured on the sample shall not have reached a height exceeding 2,5 m above the bottom edge of the burner

This performance requirement is based on the experience gained and reaffirms the value stated in section 2.8.1 of the technical report IEC 60332-3, which addresses tests on electric cables under fire conditions, specifically for bunched wires or cables, published in 1992.

5.2 Dộtermination du nombre de tronỗons de cõble 19

5.4 Durée d'application de la flamme 21

Annexe A (normative) Lignes directrices pour la sélection des câbles pour l'essai d'acceptation de type 24

Annexe B (informative) Recommandation de prescriptions de performance 25

Figure 1 – Câbles montés en disposition espacée sur la face avant de l'échelle standard 23

Figure 2 – Câbles montés en disposition jointive sur la face avant de l'échelle standard (rangées de câbles en contact) 23

Tableau A.1 – Résumé des conditions d'essai 24

ESSAIS DES CÂBLES ÉLECTRIQUES ET DES CÂBLES À FIBRES OPTIQUES SOUMIS AU FEU –

Partie 3-24: Essai de propagation verticale de la flamme des fils ou câbles montés en nappes en position verticale – Catégorie C

The International Electrotechnical Commission (IEC) is a global standards organization that includes all national electrotechnical committees Its primary goal is to promote international cooperation on standardization issues in the fields of electricity and electronics To achieve this, the IEC publishes international standards, technical specifications, technical reports, and publicly accessible specifications (PAS).

The IEC Publications are developed by study committees, which allow participation from any national committee interested in the subject matter International, governmental, and non-governmental organizations also collaborate with the IEC on these projects Additionally, the IEC works closely with the International Organization for Standardization (ISO) under terms established by an agreement between the two organizations.

Official decisions or agreements of the IEC on technical matters aim to establish an international consensus on the topics under consideration, as each study committee includes representatives from the relevant national IEC committees.

The IEC publications are issued as international recommendations and are approved by the national committees of the IEC While reasonable efforts are made to ensure the technical accuracy of the content, the IEC cannot be held responsible for any misuse or misinterpretation by end users.

To promote international consistency, the national committees of the IEC commit to transparently applying IEC publications in their national and regional documents as much as possible Any discrepancies between IEC publications and corresponding national or regional publications must be clearly stated in the latter.

5) La CEI n’a prévu aucune procédure de marquage valant indication d’approbation et n'engage pas sa responsabilité pour les équipements déclarés conformes à une de ses Publications

6) Tous les utilisateurs doivent s'assurer qu'ils sont en possession de la dernière édition de cette publication

The IEC and its administrators, employees, agents, including external experts and members of its study committees and national committees, shall not be held liable for any injuries, damages, or any other type of loss, whether direct or indirect This includes any costs or expenses, such as legal fees, arising from the publication or use of this IEC Publication or any other IEC Publication, or from the credit attributed to it.

8) L'attention est attirée sur les références normatives citées dans cette publication L'utilisation de publications référencées est obligatoire pour une application correcte de la présente publication

Attention is drawn to the fact that some elements of this IEC publication may be subject to intellectual property rights or similar rights The IEC cannot be held responsible for failing to identify such property rights or for not reporting their existence.

La Norme internationale CEI 60332-3-24 a été préparée par le comité d'études 20 de la CEI:

Elle a le statut d’une publication groupée de sécurité conformément au Guide CEI 104

IEC 60332-3-24 is part of a series of publications focused on fire testing of electrical cables, replacing the previously published IEC 60332-3 from 1992 The introduction outlines the various parts of this series.

Généralités

L'appareillage spécifié dans la CEI 60332-3-10 doit être utilisé.

Source d'allumage

La source d'allumage doit être constituée par un brûleur à propane du type à ruban, tel qu’il est spécifié dans la CEI 60332-3-10

Echantillon d’essai

L'ộchantillon d’essai doit comprendre un certain nombre de tronỗons de cõble issus de la même longueur de production, ayant chacun une longueur minimale de 3,5 m

Le nombre total de tronỗons de cõble constituant l'ộchantillon d'essai doit ờtre ộgal au nombre requis pour fournir un volume total nominal de matériau non métallique de 1,5 l/m d'échantillon d'essai

L'échantillon d'essai doit être choisi dans les limites données à l’annexe A

Les tronỗons de cõble formant l'ộchantillon d’essai doivent ờtre conditionnộs à une tempộrature de (20 ± 10) °C pendant au moins 16 h avant de commencer l'essai Les tronỗons de câble doivent être secs.

Dộtermination du nombre de tronỗons de cõble

Pour calculer le nombre appropriộ de tronỗons de cõble, il est nộcessaire de dộterminer le volume par mốtre de matộriau non mộtallique d'un tronỗon de cõble

A cable length must not be less than 0.3 m and should be cut carefully to ensure that the cut surfaces are perpendicular to the cable's axis, allowing for an accurate measurement of its length.

La masse volumique de chaque composant non métallique, (y compris les matériaux cellulaires) doit être mesurée par une méthode appropriée, par exemple selon l'article 8 de la

CEI 60811-1-3, afin d'obtenir des valeurs exprimées avec deux décimales

Each non-metallic material C_i must be removed from the sample and weighed Any non-metallic material contributing less than 5% to the total non-metallic mass of the cable section should be regarded as having a density of 1.0 kg/dm³.

When semiconductor screens cannot be separated from insulating materials, they can be regarded as part of the insulation for measuring their mass and density.

Le volume V i (en litres par mètre de câble) de chaque composant non métallique C i est calculé comme suit: ×l i i i ρ

M i est la masse du composant C i (kg); ρi est la masse volumique du composant C i (kg/dm 3 ); l est la longueur de l'échantillon de câble (m)

Le volume total, V, de matériau non métallique contenu dans 1 m de câble est égal à la somme des volumes individuels V 1 , V 2 , etc

The nearest whole number (with 0.5 and above rounding up to 1) of cable sections to be installed is calculated by dividing the specified volume per meter in section 5.1 by the total volume, V, of non-metallic material per meter of cable.

Montage de l’échantillon d’essai

5.3.1 Câbles dont au moins un conducteur est de section supérieure à 35 mm 2

For cables with at least one conductor exceeding 35 mm² in cross-section, each section of the cable must be individually secured to each rung of the ladder using a metal wire (either steel or copper) For cables with a diameter less than or equal to

50 mm, utiliser un fil de diamètre compris entre 0,5 mm et 1,0 mm Pour les câbles de diamètre supérieur à 50 mm, utiliser un fil de diamètre compris entre 1,0 mm et 1,5 mm

Cable sections must be attached in a single layer on the front face of the ladder, with a maximum total width of 300 mm The spacing between each cable section should be 0.5 times the diameter of the cable, not exceeding 20 mm (refer to Figure 1) Additionally, the distance from the edge of the test sample to the inside of the ladder's uprights must be at least 50 mm.

When assembling cable sections, the first cable section should be positioned approximately at the center of the ladder, with additional cable sections added from each end to ensure that all sections are roughly centered on the ladder.

5.3.2 Câbles dont tous les conducteurs sont de sections inférieures ou égales à 35 mm 2 et câbles à fibres optiques

For cables with all conductors having cross-sections of 35 mm² or less, as well as fiber optic cables, each section of cable must be secured, either individually or as part of a row, to each rung of the ladder using a metal wire (made of steel or copper) with a diameter ranging from 0.5 mm to 1.0 mm.

Les tronỗons de cõble doivent ờtre attachộs sur la face avant de l'ộchelle standard en disposition jointive, en une ou plusieurs couches jusqu'à une largeur maximale totale de

300 mm La distance entre le bord de l’échantillon d'essai et l'intérieur des montants de l'échelle doit être au minimum de 50 mm

When assembling cable sections, the first section or row of cable sections should be positioned approximately at the center of the scale, with additional sections or rows added from each end to ensure that the test sample is roughly centered on the scale.

If a second layer (or more) of cable sections is required after the entire width of the ladder has been utilized for the first layer (or subsequent layers), then the first section or row of cable sections in the second layer (or beyond) must be positioned approximately at the center of the ladder Additional sections or rows should be added from each side to ensure that the second layer (or subsequent layers) is approximately centered on the ladder.

If a large number of cable sections are required to form the test sample, the cable sections can be attached using specified metallic wire to each rung of the ladder, arranged in rows of flat cables with a maximum width of five cable sections To ensure uniformity, it is recommended that adjacent rows of cables be secured together at each rung to maintain a cohesive arrangement (see Figure 2).

Durée d'application de la flamme

The test flame should be applied for 20 minutes, after which it must be extinguished The airflow through the test chamber must be maintained until the cable's combustion or incandescence has stopped, or for a maximum duration of 1 hour, after which any remaining combustion or incandescence of the cable must be extinguished.

Une fois toute combustion ou incandescence du câble terminée ou éteinte, l'échantillon d'essai doit être essuyé

The soot is disregarded if, after being wiped away, the original surface remains undamaged Similarly, softened or deformed areas of non-metallic materials are not considered The flame propagation must be measured as the extent of the damaged area, recorded in meters to two decimal places, from the lower edge of the burner to the boundary of the charred zone This boundary is defined by applying pressure with a sharp object, such as a knife blade, against the surface of the cable The limit of the charred zone is indicated by a change in the surface behavior, transitioning from elastic to brittle (friable).

It is advisable that performance specifications for a specific type or class of wire or cable be provided in the individual cable standard In the absence of any specified requirements, it is recommended to use the performance specifications outlined in Annex B.

When the outcome of an unsatisfactory test is disputed, two additional tests must be conducted as specified in Article 5 The test will be deemed satisfactory if both additional tests meet the specified requirements.

The test report must include the following information: a complete description of the tested cable, the manufacturer of the cable, the specific standard under which the test was conducted, the number of cable sections, the total volume of non-metallic material per test sample of the cable sections, the mounting method (i.e., spaced or butt joint), the number of layers and sections of cable in each layer, the duration of flame application (i.e., 20 minutes), the number of burners used (i.e., one), the extent of the damaged area, and the duration of any combustion or glowing after the flame is extinguished.

Figure 1 – Câbles montés en disposition espacée sur la face avant de l'échelle standard

Figure 2 – Câbles montés en disposition jointive sur la face avant de l'échelle standard

(rangées de câbles en contact)

Lignes directrices pour la sélection des câbles pour l'essai d'acceptation de type

The selection of cable type and conductor cross-section for type acceptance testing must adhere to the specifications outlined in the cable documentation or be agreed upon by both the buyer and the manufacturer.

The limited capacity of scales necessitates careful consideration when selecting the test cable section to ensure compatibility with the prescribed mounting method for non-metallic materials Additionally, the choice of cables for this part of IEC 60332 must meet specific requirements.

• seule la faỗe avant de l'ộchelle doit ờtre utilisộe;

For cables with at least one conductor exceeding 35 mm² in cross-section, the number of cables must not exceed what is necessary to create a single layer.

300 mm de large, en permettant d'avoir un espacement entre chaque tronỗon de cõble ộgal à la moitié du diamètre du câble, mais sans excéder 20 mm;

• pour les câbles dont tous les conducteurs ont une section inférieure ou égale à 35 mm 2 et les câbles à fibre optique, il n’y a aucune restriction pour la sélection des câbles;

• le nombre minimal de tronỗons de cõble doit ờtre de deux

Un résumé de toutes les conditions pour les essais d'acceptation de type de la présente partie de la CEI 60332 est donné au tableau A.1

Tableau A.1 – Résumé des conditions d'essai

Gamme des sections de conducteur (mm 2 ) > 35 a ≤ 35 b

Volume de matériau non métallique par mètre d'échantillon d'essai (l)

Utilisation de l’échelle standard, largeur maximale de l'échantillon d'essai 300 mm:

Positionnement des tronỗons de cõbles Espacộs Jointifs

Temps d'application de la flamme (min) 20 20 a Au moins un conducteur de section supérieure à 35 mm 2 b Pas de conducteur de section supérieure à 35 mm 2 ou câble à fibres optiques

Recommandation de prescriptions de performance

L'étendue maximale de la portion carbonisée mesurée sur l'échantillon ne doit pas avoir atteint une hauteur excédant 2,5 m au-dessus du bord inférieur du brûleur

La présente recommandation de prescription de performance confirme, sur la base de l'expérience acquise, la valeur donnée précedemment en 2.8.1 du rapport technique

CEI 60332-3, Essais des câbles électriques soumis au feu – Partie 3: Essais sur des fils ou câbles en nappes, publié en 1992

Tiêu đề	Tests on Electric and Optical Fibre Cables Under Fire Conditions – Part 3-24: Test for Vertical Flame Spread of Vertically-Mounted Bunched Wires or Cables
Trường học	International Electrotechnical Commission (IEC)
Chuyên ngành	Electrical and Optical Fibre Cables
Thể loại	standard
Năm xuất bản	2009
Thành phố	Geneva

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Số trang	30
Dung lượng	0,91 MB