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BS EN 50399:2022

BS EN 50399:2022

$215.11

Common test methods for cables under fire conditions. Heat release and smoke production measurement on cables during flame spread test. Test apparatus, procedures, results

Published By Publication Date Number of Pages
BSI 2022 88
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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 ā€œelectric cableā€ 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.

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PDF Pages PDF Title
2 undefined
11 1 Scope
2 Normative references
3 Terms and definitions
13 4 Test apparatus
4.1 General
4.2 Test chamber
14 4.3 Ignition source
4.3.1 Type
15 4.3.2 Positioning
4.4 Ladder
4.5 Inlet air supply
16 4.6 Hood
4.7 Exhaust duct
4.7.1 General
4.7.2 Instrumentation in the exhaust duct
4.7.2.1 General
17 4.7.2.2 Volume flow
4.7.2.3 Sampling probe
4.7.2.4 Sampling line
4.8 Extracting ventilator; effluent cleaning
18 4.9 Smoke production measuring equipment
4.9.1 General
4.9.2 White light system
4.9.3 Laser light system
4.10 Combustion gas analysis equipment
4.10.1 General
4.10.2 Oxygen
19 4.10.3 Carbon dioxide
5 Qualification of test apparatus
5.1 General
5.2 Flow distribution measurements
5.3 Sampling delay time measurement
20 5.4 Commissioning calibrations
5.5 Routine calibration
5.5.1 General
5.5.2 Procedure
5.5.3 Calculations
21 5.5.4 Criteria
5.6 Check of the flame shape
5.7 Performance checks of the test equipment
6 Test procedure
6.1 Initial test conditions
6.2 Test sample
6.3 Sample conditioning
22 6.4 Determination of the number of test pieces
6.4.1 General
6.4.2 Circular cables with a diameter greater than or equal to 20,0 mm
6.4.3 Circular cables with a diameter greater than 5,0 mm but less than 20,0 mm
6.4.4 Circular cables with a diameter less than or equal to 5,0 mm
23 6.4.5 Non-circular cables with a major axis dimension greater than or equal to 20,0 mm, a minor axis dimension greater than 4,0 mm and a major to minor axis ratio less than or equal to 5
6.4.6 Non-circular cables with a major axis dimension greater than 5,0 mm but less than 20,0 mm, a minor axis dimension greater than 4,0 mm and a major to minor axis ratio less than or equal to 5
6.4.7 Non-circular cables consisting of two identical round cables with a very small interconnecting link (ā€œfigure of 8 cablesā€) and with a minor axis of less than or equal to 4,0 mm
6.5 Mounting of the test sample
6.5.1 Mounting of the test sample for all classes
25 6.5.2 Special mounting requirements for class B1ca
6.6 Exhaust volume flow
6.7 Propane and air flow rates to burner
6.8 Flame application time
6.9 Testing operations
26 6.10 Observations and measurements during the test
27 7 Determination of parameters derived from the test
7.1 Calculation of HRR and SPR parameters
7.1.1 Peak heat release rate value (Peak HRR)
7.1.2 Peak smoke production rate value (Peak SPR)
7.1.3 Total heat release value (THR1200)
7.1.4 Total smoke production value (TSP1200)
7.1.5 Fire Growth Rate Index (FIGRA)
7.1.6 Minimum heat release rate value (minHRR)
28 7.1.7 Minimum smoke production rate value (minSPR)
7.2 Determination of extent of flame spread (FS)
8 Test report
8.1 General
8.2 Contents
8.2.1 General information
8.2.2 Information on the cable tested
29 8.2.3 Information on the test
8.2.4 Results obtained
8.2.5 Calculated results
48 Annex A (normative)Calculation of heat release
A.1 Volume flow
A.2 Generated heat effect
A.2.1 Heat release from the ignition source
49 A.2.2 Heat release from a tested product
50 A.3 Calculation of the mole fraction of water vapour in the air
51 Annex B (normative)Smoke production
52 Annex C (informative)Additional information on Reynolds number in Figure 13
53 Annex D (normative)Flow distribution inside the duct
D.1 General
D.2 Velocity profile factor kc
D.2.1 General
D.2.2 Measurement specifications
54 D.2.3 Actions
D.2.4 Calculation of kc
55 D.2.5 Measurement report
56 Annex E (normative)Commissioning calibrations
E.1 General procedures for separate pieces of equipment
E.2 Gas analyser calibrations
E.2.1 General
E.2.2 Oxygen analyser adjustment
E.2.3 Oxygen analyser output noise and drift
E.2.3.1 Noise and drift
E.2.3.2 Actions
57 E.2.3.3 Criteria
E.2.3.4 Calibration report
E.2.4 Carbon dioxide analyser adjustment
E.3 HRR calibrations
E.3.1 General
E.3.2 HRR calibration by means of the burner
E.3.2.1 Conditions
58 E.3.2.2 Procedure
E.3.2.3 Calculations
E.3.2.4 Criteria
59 E.3.3 HRR calibration by means of burning a flammable liquid
E.3.3.1 General
E.3.3.2 Conditions to be used for burning methanol
E.3.3.3 Procedure for methanol
E.3.3.4 Calculations
60 E.3.3.5 Criteria
E.3.4 Commissioning factor kt used for HRR calculations
61 E.4 Smoke measurement system calibration
E.4.1 General
E.4.2 Stability check
E.4.3 Optical filter check for white light systems
E.4.4 Smoke calibration by means of burning a flammable liquid
E.4.4.1 General
E.4.4.2 Conditions to be used for burning heptane
62 E.4.4.3 Procedure
E.4.4.4 Calculations
E.4.4.5 Criteria
64 Annex F (informative)Guidance on calibration procedures for specific measuring equipment
F.1 General procedures for separate pieces of equipment
F.2 Gas analyser calibrations
F.2.1 Oxygen analyser adjustment
F.2.2 Carbon dioxide analyser adjustment
F.3 Check of propane mass flow controller
F.3.1 General
65 F.3.2 Actions
F.3.3 Criterion
F.4 Optical filter check for white light systems
F.4.1 General
F.4.2 Actions
F.4.3 Criterion
66 Annex G (normative)Calculation of HRRav, SPRav and FIGRA
G.1 Calculation of HRRav
67 G.2 Calculation of SPRav
68 G.3 Calculation of the Fire Growth Rate Index (FIGRA)
70 Annex H (informative)Guidance on the choice of test equipment
H.1 General
H.2 Burner and venturi mixer
H.3 Mass flow controllers
H.4 Backing board
71 Annex I (normative)Guidance on the file format for data from the test
75 Annex J (normative)Rounding of numbers
76 Annex K (informative)Check of the flame shape for nominal heat output of 20,5 kW
K.1 Introduction
K.2 Preparation of the wooden boards
77 K.3 Procedure (to be performed in duplicate)
78 K.4 Evaluation
81 K.5 Flame shape analysis
84 Annex L (informative)Guidance on conducting performance checks of the test equipment
L.1 Introduction
L.2 Fire test cable
85 L.3 Performance of the fire test cable
L.4 Procedure to check the performance of the test equipment
86 L.5 Use of an alternative cable

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BS EN 50399:2022
$215.11