BS 8414-2:2020 pdf free download.Fire performance of external cladding systems – Part2:Test method for non-loadbearing external cladding systems fixed to, and supported by, a structural steel frame.
This part of BS 8414 provides a test method for determining the fire performance characteristics of non-loadbearing external cladding systems when fixed to, and supported by, a structural steel frame and exposed to an external fire under controlled conditions. The peak fire exposure is intended to be representative of an external fire source or a fully developed (post-flashover) fire in a room venting from an aperture that exposes the cladding to the effects of external (lames.
This part of BS 8414 is solely intended to give an indication of fire spread across or within an external cladding system. The purpose of the test is to provide data to enable evaluation of the fire performance of the components when combined to form a complete cladding system.
This part of BS 8414 does not apply to non-loadbearing external rainscreen overcladding systems or external wall insulation systems applied to the face of a building, the fire testing of which is covered in BS 8414-1.
This part of BS 8414 does not cover the performance of glass or its supporting frame intended for glazed window openings.
This part of BS 8414 does not apply to glazed curtain walling systems.
This part of BS 8414 does not test the total configuration of a construction incorporating additional windows, doors, balconies or ancillary penetrations.
This part of BS 8414 does not cover exposure to radiant heat from a fire in an adjacent building.
5 Test apparatus
5.1 General
The test apparatus shall utilize a vertical structural steel test frame (5.2), representative of a structural steel-framed building, with a vertical main test apparatus wall (S1) and a vertical return wall (wing) (5A) at a 900 angle to, and at one side of, the main test wall. The main wall shall be provided with a combustion chamber (5.5). In addition to supporting the weight of the test specimen, the test apparatus shall be capable of enduring the effects of the test procedure without itself suffering undue damage or distortion.
NOTE: An example of a typical test apparatus is shown in Ftgure 1.
5.2 Structural steel test frame
The structural steel test frame shall be designed and constructed to withstand the expected loading imposed by the system under test and any subsequent distortions that can occur during the test programme. All details shall be recorded.
NOTE Annex B shows a typical structural steel test frame (see Figure 5.1). The test specimen installation might need 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