FprEN 50399
(Main)Common test methods for cables under fire conditions - Heat release and smoke production measurement on cables during flame spread test - Test apparatus, procedures, results
Common test methods for cables under fire conditions - Heat release and smoke production measurement on cables during flame spread test - Test apparatus, procedures, results
This document specifies the apparatus and methods of test for the assessment of vertical flame spread, heat release, smoke production and occurrence of flaming droplets/particles of vertically mounted electric cables under defined conditions. NOTE For the purpose of this document, the term “electric cable” covers all power, control and communication cables, including optical fibre cables and hybrid cables used for the conveyance of energy and/or signals. This document details the apparatus for the fire propagation testing and the arrangement and calibration of the instrumentation to be installed to measure the heat release and the smoke production during the test. The combustion gases are collected in a hood above the test chamber and conveyed through an exhaust system, which allows the measurement of heat release rate and smoke production. Test procedures to be used for type approval testing for classification of cables in classes [2, 7] B1ca, B2ca, Cca and Dca are given. Cable installation on the test ladder and the volume of air passing through the chamber are in accordance with the Commission Decision 2006/751/EC [6], which is reflected in the requirements of this document.
Allgemeine Prüfverfahren für das Verhalten von Kabeln und isolierten Leitungen im Brandfall - Messung der Wärmefreisetzung und Raucherzeugung während der Prüfung der Flammenausbreitung - Prüfeinrichtung, Prüfverfahren und Prüfergebnis
Méthodes d'essai communes aux câbles soumis au feu - Mesure de la chaleur et de la fumée dégagées par les câbles au cours de l'essai de propagation de la flamme - Appareillage d'essai, procédure et résultats
Le présent document spécifie l’appareillage et les méthodes d’essai pour l’évaluation de la propagation de flamme verticale, du dégagement de chaleur, de l’émission de fumée et de la production de gouttelettes/particules enflammées, avec des câbles électriques montés en position verticale et dans des conditions définies. NOTE Pour les besoins du présent document, le terme "câble électrique" couvre tous les câbles de puissance, de commande et de communication, y compris les câbles à fibres optiques et les câbles hybrides utilisés pour le transport d’énergie et/ou de signaux. Le présent document précise l’appareillage pour les essais de propagation du feu, ainsi que la disposition et l’étalonnage des instruments à installer pour mesurer le dégagement de chaleur et l’émission de fumée au cours de l’essai. Les gaz de combustion sont collectés dans une hotte au-dessus de la chambre d’essai et sont dirigés vers un système d’extraction, ce qui permet de mesurer le débit calorifique et l’émission de fumée. Les procédures d’essai à utiliser pour les essais d’homologation de type pour la classification des câbles dans les Classes [2, 7] B1ca, B2ca, Cca et Dca sont indiquées. L’installation des câbles sur l’échelle d’essai et le volume d’air circulant à travers la chambre sont conformes à la Décision 2006/751/CE de la Commission [ 6 ], dont les exigences du présent document sont le reflet.
Skupne preskusne metode za ognjevzdržnost kablov - Meritve oddajanja toplote in nastajanja dima na kablih med preskusom z razpršenim plamenom - Preskusna naprava, postopki, rezultati
General Information
RELATIONS
Standards Content (sample)
SLOVENSKI STANDARD
oSIST prEN 50399:2020
01-junij-2020
Skupne preskusne metode za ognjevzdržnost kablov - Meritve oddajanja toplote in
nastajanja dima na kablih med preskusom z razpršenim plamenom - Preskusna
naprava, postopki, rezultati
Common test methods for cables under fire conditions - Heat release and smoke
production measurement on cables during flame spread test - Test apparatus,
procedures, results
Allgemeine Prüfverfahren für das Verhalten von Kabeln und isolierten Leitungen im
Brandfall - Messung der Wärmefreisetzung und Raucherzeugung während der Prüfungder Flammenausbreitung - Prüfeinrichtung, Prüfverfahren und Prüfergebnis
Méthodes d'essai communes aux câbles soumis au feu - Mesure de la chaleur et de la
fumée dégagées par les câbles au cours de l'essai de propagation de la flamme -Appareillage d'essai, procédure et résultats
Ta slovenski standard je istoveten z: prEN 50399
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
29.060.20 Kabli Cables
oSIST prEN 50399:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50399:2020
EUROPEAN STANDARD DRAFT
prEN 50399
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2020
ICS 13.220.40; 29.060.20 Will supersede EN 50399:2011 and all of its
amendments and corrigenda (if any)
English Version
Common test methods for cables under fire conditions - Heat
release and smoke production measurement on cables during
flame spread test - Test apparatus, procedures, results
Méthodes d'essai communes aux câbles soumis au feu - Allgemeine Prüfverfahren für das Verhalten von Kabeln und
Mesure de la chaleur et de la fumée dégagées par les isolierten Leitungen im Brandfall - Messung der
câbles au cours de l'essai de propagation de la flamme - Wärmefreisetzung und Raucherzeugung während der
Appareillage d'essai, procédure et résultats Prüfung der Flammenausbreitung - Prüfeinrichtung,
Prüfverfahren und PrüfergebnisThis draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2020-06-05.
It has been drawn up by CLC/TC 20.
If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
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oSIST prEN 50399:2020
prEN 50399:2020 (E)
1 Contents Page
2 European foreword ............................................................................................................................. 6
3 Introduction ......................................................................................................................................... 7
4 1 Scope ............................................................................................................................................ 9
5 2 Normative references .................................................................................................................. 9
6 3 Terms and definitions ................................................................................................................. 9
7 4 Test apparatus ........................................................................................................................... 10
8 4.1 General.............................................................................................................................. 10
9 4.2 Test chamber .................................................................................................................... 11
10 4.3 Ignition source ................................................................................................................... 11
11 4.4 Ladder ............................................................................................................................... 13
12 4.5 Inlet air supply ................................................................................................................... 13
13 4.6 Hood .................................................................................................................................. 13
14 4.7 Exhaust duct ..................................................................................................................... 14
15 4.8 Extracting ventilator; effluent cleaning .............................................................................. 15
16 4.9 Smoke production measuring equipment ......................................................................... 15
17 4.10 Combustion gas analysis equipment ................................................................................ 16
18 5 Qualification of test apparatus ................................................................................................ 16
19 5.1 General.............................................................................................................................. 16
20 5.2 Flow distribution measurements ....................................................................................... 16
21 5.3 Sampling delay time measurement ................................................................................... 17
22 5.4 Commissioning calibrations .............................................................................................. 17
23 5.5 Routine calibration ............................................................................................................ 17
24 5.6 Check of the flame shape ................................................................................................. 18
25 5.7 Repeatability and reproducibility checks of the test equipment ........................................ 18
26 6 Test procedure .......................................................................................................................... 19
27 6.1 Initial test conditions .......................................................................................................... 19
28 6.2 Test sample ....................................................................................................................... 19
29 6.3 Sample conditioning .......................................................................................................... 19
30 6.4 Determination of the number of test pieces ...................................................................... 19
31 6.5 Mounting of the test sample .............................................................................................. 21
32 Table 1 — Mounting as a function of cable diameter (or major axis dimension for non-circular
33 cables) ........................................................................................................................................ 21
34 6.6 Exhaust volume flow ......................................................................................................... 22
35 6.7 Propane and air flow rates to burner ................................................................................. 22
36 6.8 Flame application time ...................................................................................................... 22
37 6.9 Testing operations ............................................................................................................. 22
38 6.10 Observations and measurements during the test ............................................................. 23
39 7 Determination of parameters derived from the test .............................................................. 24
40 7.1 Calculation of HRR and SPR parameters ........................................................................... 24
41 7.2 Determination of extent of flame spread (FS).................................................................... 25
42 8 Test report .................................................................................................................................. 25
43 8.1 General.............................................................................................................................. 25
44 8.2 Contents ............................................................................................................................ 25
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45 Figure 1 — General arrangement of test apparatus ...................................................................... 27
46 Figure 2 — Test chamber — dimensions ....................................................................................... 28
47 Figure 3 —Test chamber — schematic side elevation and air inlet arrangement ..................... 29
48 Figure 4 — Thermal insulation of back and sides of the test chamber ....................................... 30
49 Figure 5 — Positioning of burner and typical arrangement of test sample on ladder .............. 31
50 Figure 6 — Burner configuration ..................................................................................................... 32
51 Figure 7 — Arrangement of holes for burners ............................................................................... 33
52 Figure 8 — Schematic diagram of a burner control system using Mass Flow Controllers ...... 34
53 Figure 9 — Tubular steel ladder for EN 50399 cable test .............................................................. 35
54 Figure 10 — Schematic drawing of a hood .................................................................................... 36
55 Figure 11 — Typical guide vanes .................................................................................................... 37
56 Figure 12 — Bidirectional probe ...................................................................................................... 38
57 Figure 13 — Probe response versus Reynolds number ............................................................... 39
58 Figure 14 — Sampling probe ........................................................................................................... 41
59 Figure 15 — Schematic diagram of sampling line ......................................................................... 42
60 Figure 16 — Schematic drawing of smoke production measuring system ................................ 43
61 Figure 17 — Mounting of bundles (not on scale, only one of 15 bundles) ................................. 44
62 Figure 18 — Backboard mounting arrangement for Class B1 ................................................... 45
63 Annex A (normative) Calculation of heat release .......................................................................... 46
64 A.1 Volume flow ............................................................................................................................... 46
65 A.2 Generated heat effect ................................................................................................................ 46
66 A.2.1 Heat release from the ignition source ........................................................................... 46
67 A.2.2 Heat release from a tested product ............................................................................... 47
68 A.3 Calculation of the mole fraction of water vapour in the air .................................................. 48
69 Annex B (normative) Smoke production......................................................................................... 49
70 Annex C (informative) Additional information on Reynolds number in Figure 13 ..................... 50
71 Annex D (normative) Flow distribution inside the duct ................................................................. 51
72 D.1 General ....................................................................................................................................... 51
73 D.2 Velocity profile factor kc ............................................................................................................ 51
74 D.2.1 General ............................................................................................................................. 51
75 D.2.2 Measurement specifications .......................................................................................... 51
76 Figure D.1 — Section of the exhaust duct – Positions for measurement of the gas velocity .. 52
77 D.2.3 Actions ............................................................................................................................. 52
78 D.2.4 Calculation of k ............................................................................................................... 52
79 D.2.5 Measurement report ........................................................................................................ 52
80 Annex E (normative) Commissioning calibrations ........................................................................ 54
81 E.1 General procedures for separate pieces of equipment ......................................................... 54
82 E.2 Gas analyser calibrations ......................................................................................................... 54
83 E.2.1 General ............................................................................................................................. 54
84 E.2.2 Oxygen analyser adjustment ......................................................................................... 54
85 E.2.3 Oxygen analyser output noise and drift ....................................................................... 54
86 E.2.3.1 Noise and drift ................................................................................................................. 54
87 E.2.3.2 Actions ............................................................................................................................. 54
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88 E.2.3.3 Criteria .............................................................................................................................. 55
89 E.2.3.4 Calibration report ............................................................................................................ 55
90 E.2.4 Carbon dioxide analyser adjustment ............................................................................ 55
91 E.3 HRR calibrations ....................................................................................................................... 55
92 E.3.1 General ............................................................................................................................. 55
93 E.3.2 HRR calibration by means of the burner ...................................................................... 55
94 E.3.2.1 Conditions ....................................................................................................................... 55
95 E.3.2.2 Procedure ........................................................................................................................ 55
96 Table E.1 — Burner ignition times and HRR levels ....................................................................... 56
97 E.3.2.3 Calculations ..................................................................................................................... 56
98 E.3.2.4 Criteria .............................................................................................................................. 56
99 E.3.3 HRR calibration by means of burning a flammable liquid .......................................... 57
100 E.3.3.1 General ............................................................................................................................. 57
101 E.3.3.2 Conditions to be used for burning methanol ............................................................... 57
102 E.3.3.3 Procedure for methanol.................................................................................................. 57
103 E.3.3.4 Calculations ..................................................................................................................... 57
104 E.3.3.5 Criteria .............................................................................................................................. 58
105 E.3.4 Commissioning factor k used for HRR calculations .................................................. 58
106 Table E.2 — Example of determination of commissioning kt factor ............................................ 58
107 E.4 Smoke measurement system calibration ............................................................................... 59
108 E.4.1 General ............................................................................................................................. 59
109 E.4.2 Stability check ................................................................................................................. 59
110 E.4.3 Optical filter check for white light systems .................................................................. 59
111 E.4.4 Smoke calibration by means of burning a flammable liquid ...................................... 59
112 E.4.4.1 General ............................................................................................................................. 59
113 E.4.4.2 Conditions to be used for burning heptane ................................................................. 59
114 E.4.4.3 Procedure ........................................................................................................................ 60
115 E.4.4.4 Calculations ..................................................................................................................... 60
116 E.4.4.5 Criteria .............................................................................................................................. 60
117 Figure E.1 — Overview of commissioning calibrations ................................................................ 61
118 Annex F (informative) Guidance for calibration procedures for specific measuring
119 equipment .................................................................................................................................. 62
120 F.1 General procedures for separate pieces of equipment ......................................................... 62
121 F.2 Gas analyser calibrations ......................................................................................................... 62
122 F.2.1 Oxygen analyser adjustment ......................................................................................... 62
123 F.2.2 Carbon dioxide analyser adjustment ............................................................................ 62
124 F.3 Check of propane mass flow controller or rotameter ........................................................... 62
125 F.3.1 General ............................................................................................................................. 62
126 F.3.2 Actions ............................................................................................................................. 63
127 F.3.3 Criterion ........................................................................................................................... 63
128 F.4 Optical filter check for white light systems ............................................................................ 63
129 F.4.1 General ............................................................................................................................. 63
130 F.4.2 Actions ............................................................................................................................. 63
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131 F.4.3 Criterion ........................................................................................................................... 63
132 Annex G (normative) Calculation of HRR , SPR and FIGRA......................................................... 64
av av133 G.1 Calculation of HRRav ................................................................................................................. 64
134 G.2 Calculation of SPR .................................................................................................................. 64
135 G.3 Calculation of the Fire Growth Rate Index (FIGRA) ............................................................... 65
136 Annex H (informative) Guidance on the choice of test equipment .............................................. 66
137 H.1 General ....................................................................................................................................... 66
138 H.2 Burner and venturi mixer .......................................................................................................... 66
139 H.3 Mass flow controllers ................................................................................................................ 66
140 H.4 Backing board ........................................................................................................................... 66
141 H.5 Cable ........................................................................................................................................... 67
142 H.6 Wooden boards for the flame shape measurement .............................................................. 67
143 H.7 Software to analyse the wooden boards ................................................................................ 67
144 Annex I (normative) Guidance on the file format for data from the test ...................................... 68
145 Table I.1 — Example of the required raw data file format ............................................................. 69
146 Annex J (normative) Rounding of numbers ................................................................................... 72
147 Annex K (normative) Check of the flame shape for nominal heat output of 20,5 kW ................ 73
148 K.1 Introduction................................................................................................................................ 73
149 K.2 Preparation of the wooden boards .......................................................................................... 73
150 Figure K.1 — Shape and dimensions of the wooden board ......................................................... 73
151 K.3 Procedure (to be done in duplicate) ........................................................................................ 74
152 Figure K.2 — Positioning of the wooden board at the centre of the burner: wooden board
153 perpendicular on the burner and in contact with the back wall of the chamber ................ 74
154 K.4 Evaluation .................................................................................................................................. 74
155 Figure K.3 — Flame profile............................................................................................................... 75
156 K.5 Requirement............................................................................................................................... 76
157 Table K.1 — Coordinates for acceptable flame shape .................................................................. 76
158 Annex L (informative) Repeatability and reproducibility of test results ...................................... 77
159 L.1 Introduction................................................................................................................................ 77
160 L.2 Fire test cable ............................................................................................................................ 77
161 Figure L.1 — Illustration of the recommended fire test cable ...................................................... 77
162 L.3 Performance of the fire test cable ........................................................................................... 78
163 L.4 Procedure to test the repeatability of the test equipment (intralab testing) ....................... 78
164 L.5 Procedure to test the reproducibility of the test equipment (interlab testing) ................... 78
165 Bibliography ...................................................................................................................................... 79
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167 European foreword
168 This document (prEN 50399:2020) has been prepared by CLC/TC 20, “Electric cables”.
169 This document is currently submitted to the Enquiry.170 The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
171 This document will supersede EN 50399:2011 and all of its amendments and corrigenda (if any).
172 prEN 50399:2020 includes the following significant technical changes with respect to EN 50399:2011:
173 — inclusion of the test apparatus in this document, not only by reference to EN 60332-3-10 (see 4.1);
174 — improvements of the test apparatus (see 4.2 to 4.7), including the obligatory use of mass flow
175 controllers for the feeding of gases to the burner;176 — several improvements of the qualification of the test equipment, including a check of the flame shape
177 (5.6) and repeatability and reproducibility of the equipment (5.7);178 — additions for testing of flat cables incl. mounting (6.4, 6.5);
179 — inclusion of normative Annex K (Check of the flame shape for nominal heat input of 20,5 kW) and
180 Annex L (Repeatability and reproducibility of test results).---------------------- Page: 8 ----------------------
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181 Introduction
182 EN 50399 specifies the test apparatus and test procedures for the assessment of the reaction to fire
183 performance of cables to enable classification under the Construction Products Regulation [1, 2] to be
184 achieved.185 The test method describes an intermediate scale fire test of multiple cables mounted on a vertical cable
186 ladder and is carried out with a specified ignition source to evaluate the burning behaviour of such cables
187 and enable a direct declaration of performance. The test provides data for the early stages of a cable fire
188 from ignition of cables. It addresses the hazard of propagation of flames along the cable, the potential, by
189 the measurement of the heat release rate, for the fire to affect areas adjacent to the compartment of origin,
190 and the hazard, by the measurement of production of light obstructing smoke, of reduced visibility in the
191 room of origin and surrounding enclosures.192 The following parameters may be determined under defined conditions during the test:
193 a) flame spread;194 b) heat release rate;
195 c) total heat release;
196 d) smoke production rate;
197 e) total smoke production;
198 f) fire growth rate index;
199 g) occurrence of flaming droplets/particles.
200 The apparatus is derived from that of EN 60332-3-10 [3] but with modifications and with additional
201 instrumentation to measure heat release and smoke production during the test. It has been demonstrated
202 [4] that the utilization of these additional measurement techniques, proven for other standard tests, e.g. for
203 other building pro...
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