Measure the smoke emission when electric cable or optical fibre are burnt under defined conditions.
• Reference Standard
IEC 61034 measurement of smoke density of cables burning under defined conditions.
• Test Detail
The sample shall consist of one or more test pieces of cable , each 1.00m ± 5 mm long which shall be conditioned for at least 16 h at 23 °C ± 5°C .
The photometric system shall be energized , when the stability has been attained the zero and full scale reading shall be adjusted to 0%( absence of light) and 100% luminous transmission.
With the test sample supported above the alcohol tray , start the air circulation and ignite the alcohol.
The test is considered as ended when there is no decrease in light transmittance for 5 minutes after the fire source has extinguished or when the test duration reaches 40 min.
• Performance Requirement
It is recommend that a value of 60% light transmittance is adopted as minimum for any cable tested against this standard.