Retardant wire and cable refers to the specified test conditions is burned with a flame spread only within a limited range. After the fire source is removed, the residual smoke and burning residues can be self-extinguishing properties within a limited time of the cable .
( 1 ), flame retardant wire and cable rating
Finished wire and cable flame into a single combustion test and bunched burning test .
A, single with burning test method : a sample taken from a predetermined length of the vertical support, placing adhesive kraft paper flame indicator in the upper sample, surgical cotton placed below the sample, the sample for the burner to fire 15S, 15S stop repeated five cycles, if the flame indicator to burn off more than 25%, burning drip ignite cotton, flame lasts longer than 60S is judged to have failed, contrary to qualified.