Measurement of Smoke Density of Cables Burning under Defined Conditions — Part 1: Test Apparatus
1 Scope
This part of IEC 61034 provides details of the test apparatus to be used for measuring smoke emission when electric or optical cables are burnt under defined conditions, for example, a few cables burnt horizontally. The light transmittance (lt) for flaming and smouldering conditions can be used as a means of comparing different cables or complying with specific requirements.
Note: For the purposes of this standard, the term "electric cable" covers all insulated metallic conductor cables used for the conveyance of energy or signals.
2 Normative References
The following normative document contains provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below.
GB/T 5169.1-1997 Fire Hazard Testing for Electric and Electronic Products — Part 4: Terminology Concerning Fire Tests (idt IEC 60695-4:1993)
3 Definitions
For the purpose of this standard, the definitions given in GB/T 5169.1 apply.
4 Details of Test Enclosure
The equipment shall comprise a cubic enclosure with inside dimensions of 3 000 mm ± 30 mm and constructed of a suitable material fixed on to a steel angle frame. One side shall have a door, with a glass inspection window. Transparent sealed windows (minimum size 100 mm × 100 mm) shall be provided on two opposite sides to permit the transmission of a beam of light from the horizontal photometric system. The distance from the floor to the centre of these windows shall be 2 150 mm ± 100 mm (see Figure 1).
Foreword II IEC Foreword III Introduction V 1 Scope 2 Normative References 3 Definitions 4 Details of Test Enclosure 5 Photometric System 6 Standard Fire Source 7 Smoke Mixing 8 Blank Test 9 Qualification of Test Apparatus 10 Qualification Burning Test Annex A (Informative) Guidance Notes
