LSZH cable by definition is less smoke after a fire, halogen-free cable. Halogen principle is to let the cable does not produce a lot of smoke and toxic gases when burned in flames, so that people in combustion without causing a lot of casualties, greatly improving the survival rate of people in the fire.
LSZH cable testing requirements, in line with three requirements:
Flame-retardant requirements: low-smoke halogen-free cables must be flame-retardant. There are two flame retardant grades, which are required to comply with IEC 60332.1 (single cable vertical burning test) and IEC 60332.3C (bundled cable vertical burning test). Wherein the flame retardant requirements of IEC 60332.1 using ordinary cable flame retardant, requires relatively high and IEC60332.3C, trunk belonging flame retardant grade.
Smoke density requirements: To LSZH cable smoke density test. It is in a confined space with a fire burning the cable, until the flame is extinguished after the final test smoke density chamber required in the case of smoke, the light-transmitting ability to reach 60%, thus ensuring that people can see in the smoke the way.
Toxicity requirements: Currently there are several methods of toxicity testing, such as test mice, and so on. Halogen in the cable employed in a halogen acid gas emission test (test for low halogen) and a gas acidity test (test for halogen-free). Test principle method Diyanwulu material gas at elevated temperature (deg.] C, respectively 800 and 935 deg.] C) produced by the analysis of the halogen content is determined.
Mineral cable operating temperature of 250 deg.] C continuous, sustainable power at 950 ℃ -1000 ℃ 3 hours or very short period accessible work 1083 ℃ melting point of copper. The following applies to 1000V nominal line voltage.
Once the laying of the cable may never use.
