... , Number of cores: 1, 2, 3, 3+1, 3+2, 3+3, 4, 4+1, 4+2, 5 and so on.b, Construction ... free, and non-smoke nonhalogented and three classes ofA, B, C. 2 XLPE Power CableThe Rated Voltage(kv):1st class 0.6/1 1.8 ... /3 3.6/6 6/10 ... 8.7/15 12/20 18/30 21/35 2nd class 1/1 3/3 6/6 8 ...