IEC 60695-4-2005 pdf – Fire hazard testing – Part 4: Terminology concerning fire tests for electrotechnical products.
1 Scope The terms and definitions defined in this standard are applicable to fire tests for electro- technical products. One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC Guide 104:1997, The preparation of safety publications and the use of basic safety publications and group safety publications ISO/IEC 13943:2000, Fire safety – Vocabulary ISO/IEC Guide 51:1999. Safety aspects – Guidelines for their inclusion in standards 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. Some of the terms and definitions listed appear in ISO/IEC 13943. 3.1 abnormal heat heat that is additional to that resulting from use under normal conditions, up to and including that which causes a fire situation 3.2 acute toxicity ability of a substance to produce rapidly occurring adverse effects upon a living organism 3.3 afterflame time the length of time during which an afterflame persists (also called duration of flaming) 3.4 afterglow time the time length of during which an afterglow persists
3.5 asphyxiant toxicant causing loss of consciousness and ultimately death resulting from hypoxic effects, particularly on the central nervous and/or cardiovascular systems 3.6 burned area the area of a material that has been destroyed by combustion or pyrolysis, under specified test conditions, excluding any area damaged only by deformation NOTE Expressed in m 2 . 3.7 char (verb) to form char 3.8 corrosion damage the physical and/or chemical damage or impaired function caused by the fire effluent especially by chemical action 3.9 corrosion target the sensor – product, component, or a reference material simulating them – used to determine the degree of corrosion damage, under specified test conditions 3.10 detonation an explosion propagating at supersonic velocity and characterized by a shock wave 3.11 draught free environment an environment in which the results of experiments are not significantly affected by the local air speed, for example: a) qualitatively, an environment in which a wax candle flame remains essentially undisturbed; b) quantitatively, an environment in which the air speed is not greater than 0,1 m/s 3.12 ease of ignition the ease with which a specimen can be ignited under specified test conditions (see also exposure time and minimum ignition time) 3.13 effective exposure concentration 50 EC 50 concentration of a toxicant, or mixture of toxicants, statistically calculated from concentration response data over time that causes a specific observed effect in 50 % of a population of a given species under specific conditions NOTE The observed effect is typically either a behavioural response of incapacitation or death. The effective concentration for a lethal exposure is termed “LC 50 ”, the lethal concentration.
3.14 exposure dose quantity of gaseous toxicant or a fire effluent which is available for inhalation, i.e. the integrated area under either the concentration-time curve or the volume fraction-time curve NOTE It is usually expressed in units of g×min×m -3 or 10 – 6 ×min. 3.15 exposure time the specified length of time for which a material is exposed to an ignition source (see also ease of ignition and minimum ignition time) NOTE Expressed in seconds (s). 3.16 extent of combustion the maximum length of a material that has been destroyed by combustion or pyrolysis, under specified test conditions, excluding any region damaged only by deformation 3.17 extinction area of smoke product of the extinction coefficient and the volume occupied by the smoke NOTE It is a measure of the amount of smoke. 3.18 extinction coefficient of smoke natural logarithm of the opacity of smoke divided by the path length of the light used to measure the smoke opacity 3.19 fire a) a process of combustion characterized by the emission of heat and effluent accompanied by smoke, and/or flame, and/or glowing; b) rapid combustion spreading uncontrolled in time and space 3.20 fire barrier a part able to provide simultaneously a given fire integrity and thermal insulation under specified test conditions 3.21 fire behaviour the change in, or maintenance of the physical and/or chemical properties of a material, product and/or structure exposed to fire NOTE This concept includes both reaction to fire and fire resistance.