AS/NZS IEC 61034.2:2017 pdf download – Measurement of smoke density of cables burning under defined conditions Part 2: Test procedure and requirements
1 Scope This part of IEC 61 034 provides details of the test procedure to be employed for the measurement of the density of smoke emitted from cables burning under defined conditions. It describes the means of preparing and assembling cables for test, the method of burning the cables, and gives recommended requirements for evaluating test results. 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 60695-4, Fire hazard testing – Part 4: Terminology concerning fire tests IEC 6081 1 -203, Electric and optical fibre cables – Test methods for non-metallic materials – Part 203: General tests – Measurement of overall dimensions IEC 61 034-1 , Measurement of smoke density of cables burning under defined conditions – Part 1: Test apparatus IEC Guide 1 04:1 997, The preparation of safety publications and the use of basic safety publications and group safety publications ISO/IEC 1 3943:2000, Fire safety – Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions in IEC 60695-4 apply, or if a term is not defined in IEC 60695-4 then the definition in ISO/IEC 1 3943 applies. 4 Test apparatus The test procedure defined in this Part 2 of IEC 61 034 shall be carried out using the test apparatus, i.e. test enclosure, photometric system and standard fire source, given in IEC 61 034-1 . 5 Test assembly 5.1 Test sample The test sample shall consist of one or more test pieces of cable, each 1 ,00 m ± 0,05 m long, which shall be carefully straightened and then conditioned for at least 1 6 h at 23 °C ± 5 °C.
5.2.2 Mounting of test sample The test sample shall remain in situ during the test as follows: – individual test pieces or bundles of test pieces shall be bound together at the ends, and at 300 mm from each end, at which place they shall be clamped to the support by means of wire binders. NOTE Depending upon construction, test samples prepared from small cables or flexible cables may be subject to movement during the test. In these cases, it is also recommended that the test pieces or bundles are bound with two turns of approximately 0,5 mm diameter wire in the centre and at every 1 00 mm each side from the centre. Alternatively, the test pieces or bundles may be tensioned at one or both ends by means of an appropriate device, for example a spring or a weight. 5.3 Positioning of test sample The tray containing the alcohol shall be supported above the ground surface to permit air circulation around and beneath the tray. The individual test pieces or the bundles of test pieces shall be laid touching in a horizontal position and centred above the tray so that the distance between the underneath of the test sample and the bottom of the tray is 1 50 mm ± 5 mm (see Figure 2). 6 Test procedure NOTE Before each test, it may be necessary to clean the windows of the photometric system to regain 1 00 % light transmission after stabilization of the voltage (see also Clause A.2 of IEC 61 034-1 ). 6.1 Immediately before commencing a test, the temperature within the cube shall be in the range of 25 °C ± 5 °C when measured at the internal door surface at a height of 1 ,5 m to 2,0 m and a minimum of 0,2 m from the walls.