BS 8602:2013 pdf download

BS 8602:2013 pdf download.Method for assessment of fire integrity of cast resin busbar trunking systems for the safety critical power distribution to life safety and fire fighting systems.
6 Installation of the test specimen in the furnace
6.1 General
The test specimen shall be located within the furnace in such a way as to prevent direct flame impingement on the test specimen.
The vertical and horizontal sections of busbar trunking in the test specimen shall be installed so as to allow for the expansion of the test Specimen. The vertical section shall be installed through the roof of the furnace and shall incorporate the manufacturer’s standard spring hanger assembly that would be used for the installation of the busbar trunkirig within a riser.
The vertical section of the busbar trunking assembly shall be sufficiently long to give a minimum straight section length of 1 m within the furnace (excluding the bend and joining materials).
The horizontal section of the busbar trunking assembly shall be sufficiently long to give a minimum straight section length of 3 m within the furnace (excluding the bend and jointing materials).
The test specimen shall be installed in the furnace in a manner representative of its use in practice.
The structural openings in the wall and roof of the furnace after the busbar trunking has been installed shall be fire stopped.
NOTE I The method of fire stopping is at the tester’s discretion.
NOTE 2 The fire stopping materials selected should be sufficiently robust to maantaln the test conditions within the furnace.
The parts of the busbar trunking assembly within the furnace shall be installed in such a way that they are exposed to the heat from the flames from the furnace burners from all sides over their whole length.
There shall be a clearance of (500 ±50) mm between the top of the busbar trunking or busbar trunking tapoff and the roof of the furnace and also at least 500 mm between the underside of the horizontal section of the busbar trunking assembly and the floor of the furnace. Similarly there shall be a clearance of >500 mm between the sides of the busbar trunking assembly and the furnace walls. There shall also be a clearance of ‘500 mm between the vertical section of the busbar trunking assembly and the furnace walls.
Where two or more test specimens are to be tested in the furnace at the same time, at least 500 mm clearance shall be provided between the specimens.
6.2 Application of instrumentation
The six thermocouples (4.3) shall be installed in the furnace; three thermocouples shall be located either side of the test specimen, equally spaced along the length of the horizontal run of busbar trunking. at a distance of (100 ±50) mm from the exposed face of the test specimen and at the mid.height of the specimen, to ensure they give a reliable indication of the mean temperature In the vicinity of the test specimen.
The thermocouples shall be positioned so that they are not in contact with the flames from the furnace burners and so that they are at least 450 mm away from the floor, roof or any wall of the furnace.
The furnace temperature given by the mean value of the readings from the six thermocouples shall be recorded at intervals not exceeding 1 mm for the duration of the heating period.
The mean temperature of the furnace derived from the mean reading of the six thermocouples shall be monitored and controlled such that it follows the standard time temperature curve indicated in Figure 3.
A pressure of 20 Pa shall be maintained within the furnace measured 100 mm below the roof of the furnace. The furnace pressure shall be measured and recorded continuously or at intervals of not more than 1 min.