simple understanding of the flame retardant grade of wire and cable
from：guichao author：admin click： 296 addtime：2016-09-02 11:12:39
do the wire and cable industry for zr is familiar, wire and cable specifications of most of the former has a zr or za, zb, zc and so on words, so this represents what meaning the flame? we briefly explain, what is the level of wire and cable flame retardant, wire and cable flame retardant grade is how the level of.
zr is the meaning of flame retardant, flame retardant a, b, c three, zb on behalf of class b flame retardant, zr by default to c grade flame retardant.
flame retardant properties za>zb>zc. whether it is home improvement wire or power cable will have the distinction of flame retardant grade.
flame retardant cable a\b\c class is based on the provisions of the gb/t18380-2008 standard, is used to evaluate the vertical installation of wire and cable or optical cable under the provisions of the ability to inhibit the flame vertical spread.
zb-bvr1.5.jpg
flame retardant a: refers to the cable installed in the test in order to test the total volume of steel in the non metal material is 7l/m, and the fire for 40 minutes, stop burning, dry samples, measured the sample maximum range shall not be higher than the bottom of the 2.5m burner carbonization
flame retardant b refers to the cable installed in the test in order to test the total volume of steel in the non metal material is 3.5l/m, and the fire for 40 minutes, stop burning, dry samples, measured the sample maximum range shall not be higher than the bottom of the 2.5m burner carbonization
flame retardant c refers to the cable installed in the test in order to test the total volume of steel in the non metal material is 1.5l/m, and the fire for 20 minutes, stop burning, dry samples, measured the sample maximum range shall not be higher than the bottom of the 2.5m. burner carbonization