Fire Resistant Test

General Information

- Fire Alone (IEC 60331)

A cable sample of 1200 mm in length is placed over a gas burner and connected to an electrical supply at it’s rated voltage. Fire is applied for a period of 3 hours. The temperature on the cable is between 750℃ & 800℃. After 3 hours, the fire and the power is switched off. 12 hours later, the cable sample is re-energized and must maintain it’s circuit integrity.

•   Standard Table for fire test

BS 6387	Test Temp.	only Fire for(..hours)	with Water	with mech. Shock
	650 °C	(3 hours) A	W	X
	750 °C	(3 hours) B	W	Y
	950 °C	(3 hours) C	W	Z
	950 °C	(3 Min) S	W	Z

Conductors are connected to a separate phase of a transformer output with a 2 A fuse with the nominal voltage Uo/U. Where metallic sheath, armour or screen acts as a neutral or protective conductor, it shall be connected as for a neutral or protective conductor. After the test duration of 90 minutes the burner will be switched off but the cable sample shall remain energized for further 15 min. The total test duration shall be the flame application time together with the 15 min cooling period. The test will be passed if during the course of the test no fuse fails and a conductor does not rupture, i.e. the lamp is not extinguished.

Kind of test using the equipment:

- Fire Alone (IEC 60331, BS 6387)

- Fire With Water (BS 6387)

- Fire With Mechanical Shock (IEC 60331, BS 6387)

Technical specifications
- Shape size of control cabinet: 1200 x 555 x 1780 mm 
- Framework for burning: 1300 x 1500 mm 
- Ribbon burner: effective length 500 mm 
- Air compressor: 0.3 m³/h
- Three phase transformer