Measurement of Smoke Density
This test assesses smoke development during the
burning of the cable or the impairment of visibility
caused by burning cables.
The reduction in light transparency is measured in a
standard chamber.
Standards:
- IEC 61034-1 and IEC 61034-2
- EN 61034-1 and EN 61034-2
UL 1666 with UL1424 for FPLR
Two sets of specimens, each representing a cable
construction, are to be tested. Each set should
consist of multiple 5.33 m specimen lengths of cable
fixed vertically in a 2.44 m long, 5.80 m high chamber.
The test flame is applied to the cable specimens for
30 minutes. The flame propagation height of each set
of cable specimens shall not equal or exceed 3.66 m.
The temperature of any thermocouple shall not
exceed 454.4°C.
BS 8434-2 Enhanced
The flame temperature is set at 930 degrees for 120 minutes.
The first 60 minutes involve exposure to flame and mechanical
impact, followed by an additional 60 minutes with flame,
mechanical impact, and water spray.
Pg. 5