Resistance to Fire With Mechanical Shock Test
Determine the cable of rated voltage not exceeding 600/1,000 V capability to maintain circuit integrity under fire conditions.
BS 6387 – Test method for resistance to fire of cables required to maintain circuit integrity under fire conditions
The flame test temperature used and the test duration to category Z , 950 ± 40°C for 15 minutes.
The sample shall be a piece of completed cable not less than 1200 mm long. Connect each conductor of sample to a seperate phase of transformer output with a 2 A fuse or circuit breaker in each phase.
Switch on the electricity supply and adjust the voltage between phases to the rated voltage U (or in the case of a single core cable to the rated voltage to earth, U0 ).
Start the shock producing device and ignite the burner , adjust the air and gas supply to achieve the temperature required.
None of circuit breaker trips and none of the lamps is extinguished during the period of test