BS 8414-2:2020 pdf 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 5.2Structural steel test frame The structural steel test frame shall be designed and constructed to withstand the expected loadingimposed by the system under test and any subsequent distortions that can occur during the testprogramme.All details shall be recorded. NOTE AnnexB shows a typical structural steel test frame (see Eigure B.1).The test specimen installation mightneed modification of, or additions to, an existing base test frame. 5.3 Main test apparatus wall (main face) The main test apparatus wall onto which the test specimen is applied shall be: a) vertical, extending (7 700 ±100) mm above the top of the combustion chamber opening; and b) at least 2 600 mm wide. 5.4 Return wall (wing) The return test apparatus (wing) wall onto which the test specimen is applied shall be: a) vertical, of the same height as the main test wall; b)at least 1 500 mm wide; and c)perpendicular to the main test apparatus wall. 5.5Combustion chamber The combustion chamber shall be constructed in accordance with the dimensions shown in Figure 1,including the provision of a robust lintel across the head of the chamber opening and a solid platformable to support the heat source.T’he combustion chamber shall be capable of enduring the effects ofthe test procedure without itself suffering undue damage or distortion. NOTE A nominal cross-section of 200 mm × 200 mm produced from C25/30 grade concrete has been found toproduce a suitable lintel. The combustion chamber shall be positioned at the base of the vertical main test apparatus wall andfully sealed to prevent air ingress, except for an opening such that the fire can project through theopening at the base of the vertical main test apparatus wall. The top of the chamber opening shall be (2 000 ±100) mm above the base of the test facility and shallbe (2000±100) mm wide. A distance of (260±100) mm shall be allowed from the side of the opening of the combustion chamber to the finished face of the test specimen under test (see Figure 1).A timber crib heat source(5.6) shall be installed within the combustion chamber. 5.6Timber crib heat source The timber crib heat source shall be as specified in Annex A.5.7Thermocouples 5.7.1General All thermocouples shall conform to BS EN 60584-1:2013,Type K (Chromel/Alumel).The thermocouples shall...
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