IEC 61482-1-1:2009

FOREWORD
1 Scope
2 Normative references
3 Terms, definitions and symbols
   3.1 Terms and definitions
   3.2 Symbols and units
4 Principle of the test methods
   4.1 Test method A
   4.2 Test method B
5 Significance and use of the test methods
6 Test apparatus
   6.1 General
   6.2 Method A - Arrangement of the two-sensor panels
   6.3 Method A - Panel construction
   6.4 Method B - Arrangement of the mannequins
   6.5 Method B - Mannequin construction
   6.6 Sensor response
   6.7 Calorimeter construction
   6.8 Supply bus and electrodes
        6.8.1 General
        6.8.2 Electrodes
        6.8.3 Fuse wire
   6.9 Electric supply
   6.10 Test-circuit control
   6.11 Data acquisition system
7 Precautions
8 Specimen preparation
   8.1 Test specimens
        8.1.1 Test specimens for method A: two-sensor panel
               test
        8.1.2 Test specimens for method B: four-sensor
               mannequin
   8.2 Laundry conditioning of test specimens
9 Calibration
   9.1 Data acquisition system precalibration
   9.2 Calorimeter calibration check
   9.3 Arc exposure and apparatus calibration for the
        two-sensor panels and the monitoring sensors
        9.3.1 Test apparatus
        9.3.2 Positioning of the two-sensor panels, mannequins
               and monitoring sensors
        9.3.3 Apparatus calibration for the two-sensor panels
               and monitoring sensors
   9.4 Confirmation of test apparatus setting
10 Test apparatus care and maintenance
   10.1 Surface reconditioning
   10.2 Care of sensor panels and mannequins
   10.3 Care of electrodes
11 Test procedures
   11.1 Test parameters
   11.2 Sequence of tests
        11.2.1 Panels
        11.2.2 Mannequins
        11.2.3 Test criteria
   11.3 Initial temperature
   11.4 Specimen mounting
        11.4.1 Method A panels
        11.4.2 Method B mannequins
   11.5 Specimen characteristics
   11.6 Test protocol
12 Interpretation of results
   12.1 Heat transfer
        12.1.1 Determining time zero
        12.1.2 Plotting sensor response
        12.1.3 Sensor response versus Stoll curve
        12.1.4 Determination of heat attenuation factor (HAF)
   12.2 Determination of breakopen threshold energy, E[BT50]
   12.3 Arc rating
   12.4 Visual inspection
13 Test report
Annex A (normative) Measurement of char length
Annex B (informative) Logistic regression technique
Annex C (informative) Heat attenuation factor
Bibliography

IEC 61482-1-1:2009 specifies test methods to measure the arc thermal performance value of materials intended for use in heat- and flame-resistant clothing for workers exposed to the thermal effects of electric arcs and the function of garments using these materials. These test methods measure the arc thermal performance value of materials which meet the following requirements: less than 100 mm char length and less than 2 s afterflame after removal from flame, when tested in accordance with ISO 15025, procedure B (bottom-edge ignition) on the outer material, and the char length measured using a modified ISO method as described in Annex A. These methods are used to measure and describe the properties of materials, products, assemblies or garments, in response to convective and radiant energy generated by an electric arc in open air under controlled laboratory conditions. The materials used in these methods are in the form of flat specimens for method A and garments for method B. Method A is used to determine the arc rating of materials and material assemblies when tested in a flat configuration. Method B is used to measure garment response, not arc rating, to an arc exposure including all the garment findings, sewing thread, fastenings, fabrics and other accessories when tested on a male mannequin torso. Method B is also used for accident replication.