BS 8414-2:2020 pdf free download – Fire performance of external cladding systems Part 2: Test method for non-loadbearing external cladding systems fixed to, and supported by, a structural steel frame.
5.7.2 External thermocouples
5.7.2.1 General
External thermocouples shall be positioned to a tolerance of ±10mm with the hot junction positioned (50 ±5) mm in front of the face of the test specimen.
5.7.2.2 External thermocouples at levels 1, 2 and 3
External thermocouples shall be located at levels 1, 2 and 3 on the test specimen as follows (see Figure 2).
a) Thermocouples shall be positioned in front of the main test wall face on the centre line and at 500 mm and 1 000 mm each side of the centre line of the combustion chamber (five locations).
b) Thermocouples shall be positioned in front of the wing test wall face, at 150 mm, 600 mm and 1 050 mm from the finished face of the main test wall face (three locations).
NOTE Levels 1, 2 and 3 are meant to represent floor spacing in a building. The results obtained from levels at the distances above the combustion chamber opening stipulated in Figure 2 are valid forgreaterfloor separation distances.
5.7.3 Internal thermocouples
5.7.3.1 General
Internal thermocouples shall be positioned at level 2 and level 3 only to a tolerance of ± 10 mm in accordance with 5.7.3.2 and Figure 2 and clear of any cavity barrier.
NOTE For cases where the cavity barrier coincides with thermocouples at level 3 (i.e. 7500 mm above the top of the combustion chamber), the edge of the slab should be moved downwards to allow the cavity barrier to be fixed at least 50 mm below the thermocouples.
They shall be positioned at the mid-point of each layer and cavity with a depth 10 mm.
5.7.3.2 Internal thermocouples location
Internal thermocouples at level 2 and level 3 of the test specimen shall be located as follows (see Figure 2).
a) Thermocouples shall be positioned within each layer of the main test wall face on the centre line and at 500 mm and 1 000 mm each side of the centre line of the combustion chamber (five locations).
b) Thermocouples shall be positioned within each layer of the wing test wall face, at 150 mm, 600 mm and 1 050 mm from the finished face of the main test wall face (three locations).
5.10 Audio-visual equipment
A continuous audio-visual record of the full height of both external test faces shall be taken throughout the period of the test. The recording shall capture the full duration of the test and record full details of fire spread and mechanical performance in such detail that a full evaluation of the system performance is possible. The quality of the recording shall be such that it enables the extraction of clear still images.
Both the external and innermost faces of the test specimen shall be monitored.
5.11 Environmental test condition monitoring equipment
Equipment for monitoring wind speed, such as an anemometer, shall have an accuracy of ±0.1 rn/s for measuring the ambient air velocity.
5.12 Timing device
The timing device used, such as a clock, shall have an accuracy of greater than 5 s/h.