This part of IEC 61482 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.<\/p>\n
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.<\/p>\n
The materials used in these methods are in the form of flat specimens for method A and garments for method B.<\/p>\n
Method A is used to determine the arc rating of materials and material assemblies when tested in a flat configuration.<\/p>\n
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.<\/p>\n
It is the responsibility of the user of this part of IEC 61482 to establish appropriate safety and health practices prior to use. For specific precautions, see Clause 7.<\/p>\n
The test methods in this part of IEC 61482 are not directed to classify by protection classes. Methods determining protection classes are prescribed in IEC 61482-1-2.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 6<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3 Terms, definitions and symbols 3.1 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3.2 Symbols and units 4 Principle of the test methods 4.1 Test method A <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 4.2 Test method B 5 Significance and use of the test methods 6 Test apparatus 6.1 General <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 6.2 Method A \u2013 Arrangement of the two-sensor panels Figures Figure 1 \u2013 Method A \u2013 Arrangement of three two-sensor panels with monitoring sensors (plan view) <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 6.3 Method A \u2013 Panel construction Figure 2 \u2013 Method A \u2013 Two-sensor panel (face view) with monitoring sensors <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 6.4 Method B \u2013 Arrangement of the mannequins Figure 3 \u2013 Method A \u2013 Sliding two-sensor panel <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Figure 4 \u2013 Supply bus and arc electrodes showing the position of mannequin(s) and monitoring sensors <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 6.5 Method B \u2013 Mannequin construction Figure 5 \u2013 Positioning of electrodes and monitoring sensors <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 6.6 Sensor response 6.7 Calorimeter construction Figure 6 \u2013 Four-sensor mannequin, front view <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure 7 \u2013 Calorimeter and thermocouple details <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 6.8 Supply bus and electrodes Figure 8 \u2013 Typical installation of the copper sensor mounted in the panel and the calorimeter mounted in the monitoring sensor <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Figure 9 \u2013 Example of supply bus and arc electrodes for panels <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 6.9 Electric supply 6.10 Test-circuit control 6.11 Data acquisition system 7 Precautions <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 8 Specimen preparation 8.1 Test specimens 8.2 Laundry conditioning of test specimens 9 Calibration 9.1 Data acquisition system precalibration 9.2 Calorimeter calibration check <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 9.3 Arc exposure and apparatus calibration for the two-sensor panels and the monitoring sensors 9.4 Confirmation of test apparatus setting <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 11.3 Initial temperature 11.4 Specimen mounting <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 11.5 Specimen characteristics Figure 10 \u2013 Typical material clamping assembly <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 11.6 Test protocol 12 Interpretation of results 12.1 Heat transfer <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Figure 11 \u2013 Typical sensor temperature-rise curve with time scale and baseline correction <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Table 1 \u2013 Human tissue tolerance to heat, second-degree burn [1] <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | 12.2 Determination of breakopen threshold energy, EBT50 12.3 Arc rating 12.4 Visual inspection <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | 13 Test report <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Annex A (normative) Measurement of char length Table A.1 \u2013 Total tearing load <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Annex B (informative) Logistic regression technique <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Annex C (informative) Heat attenuation factor <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Live working. Protective clothing against the thermal hazards of an electric arc – Test methods. Method 1. Determination of the arc rating (ATPV or EBT50) of flame resistant materials for clothing<\/b><\/p>\n |