... class A is best, while C worst. clients can select any type of cable for practical needs. Fire resistance property if the ... with the standard of GB/T 19666. Clients can choose any type of cable for pracitcal needs. Low smoke, low halogen, flame ... cable: plus DDZA DDZB DDZC DDZD before the type of common control cable.Any other requirement like inflame retardant,fire resistant, LSOH ...