| 摘要 |
FIELD: electricity, heating. ^ SUBSTANCE: in the cable with multi-wire electric conductors and the convexo-concave shape of the surface, at least one of the electric conductor cables is made by the joining of wires from materials with different specific resistance, in this case, the relationship of the number of wires with smaller specific resistance to number of wires with high specific resistance in all electric conductors is selected identically, in particular, at least, one electric conductor is made of steel-copper from one steel central wire and six, identical on diameter, lateral steel and copper wires with all possible variants of the relationship of the number copper wires to the number steel wires. The invention provides the technical possibilities of creating of heating cables with various electric resistances from the calculation for 1 linear metre of length. ^ EFFECT: increase in the efficiency and reliability of a heating cable. ^ 2 cl, 2 dwg |
