BS 6387:2013 pdf free.Test method for resistance to fire of cables required to maintain circuit integrity under fire conditions.
BS 6387 This British Standard gives a test method for resistance to fire of cables required to maintain circuit integrity under fire conditions. It is applicable to cables of rated voltage not exceeding 600/1 000 V and of overall diameter less than or equal to 20 mm.The test given in this British Standard is applicable to cables having two or more insulated conductors, whether or not the cables incorporate other metallic elements such as armour, screen or circuit protective conductor. The test is also applicable to cables having one insulated conductor provided that the cable incorporates at least one other metallic element. The test is not applicable to cables having one insulated conductor but no other metallic element.Each test shall be carried out in a chamber with facilities for disposing of any noxious gases resulting from burning. Sufficient ventilation shall be available to sustain the burner flame for the duration of the test.The locations of any air inlets and exhaust chimney shall be such that the burner flame remains stable during each test protocol. For each test protocol, the same ventilation and shielding conditions as used for the verification of the source of heat shall be used.The temperature in the chamber shall be between 10 °C and 40。C at the start of each test. Circuit continuity checking and voltage withstand arrangement, comprising  a three-phase star-connected transformer or three single-phase transformers (or one single-phase transformer if testing a single-core cable) of sufficient capacity to maintain the test voltage up to the maximum leakage current allowable,i.e. up to 2 A, and at the opposite end of the cable one or more lamps (with
ballast resistor if necessary) connected to each core with a power rating such that each core carries a current of approximately 0.25 A at the rated voltage of the cable.BS 6387 pdf download.