For the halogen-free cable test

For the halogen-free cable tested, need to meet three requirements: 

(1) flame retardant requirements: 
      LSZH cables must be flame retardant. The flame-retardant grades two, namely the request complies with IEC 60332.1 (a single cable vertical burning test), and IEC 60332.3C (vertical burning bunched cables spread test). Flame retardant IEC 60332.1 which requires the use of common cables flame retardant requirements, IEC 60332.3C requires a relatively high level of flame-retardant requirements are trunk. 
      Some of the information presented IEC 60332.1 equivalent level requirements of UL CM (IEC 60332.2 is a small diameter cable test methods, testing can not use 60332.1 alternative test methods used), IEC 60332.3C level equivalent to the requirements of UL CMR. In fact, the four standard test method is not the same, can not be directly compared. Therefore, the argument can only be tentatively listen. 

  (2) smoke density requirements 
      LSZH cable to the smoke density test. It is used in a confined space fire burning cables, until the flame goes out after the final test of indoor smoke density requirements in the case of smoke, the ability to achieve 60% light transmission, thus ensuring that people can see the smoke road. 

  (3) toxicity requirements 
      At present several types of toxicity testing methods, such as the mouse experiment, and so on. In LSZH cable is used in halogen acid gas emission test (test for low halogen) and the gas acidity test (test for halogen-free). The test principle is halogen-free materials at high temperatures (respectively 800 ℃ and 935 ℃) generated by the gas analysis method to determine the halogen content. 
      Since low smoke zero halogen flame retardant cable, so now also known as flame-retardant low smoke zero halogen low smoke zero halogen cables (FR / LSOH) cable. 
LSZH cables in China have a foundation, the introduction of a number of national standard, the Ministry of standard (Ministry of Public Security, Ministry of Information Industry) standard grade cable manufacturing, cable manufacturing standards.