Cable outer diameter computational formula
1, jacket thickness: pre extrusion diameter x 0.035+1 (in line with the power cable, the nominal thickness of single core cable should be not less than 1.4mm, the nominal thickness of the multicore cable should be not less than 1.8mm)
 
2. Measuring the thickness of sheath: sheath thickness = (after extrusion sheath perimeter - before extrusion sheath perimeter ) /2 π or sheath thickness = (after extrusion sheath perimeter - before extrusion sheath perimeter ) x 0.1592
 
3, the insulation thickness most thin point: the nominal value × 90%-0.1
 
4, no armor shielding sheath thinnest point: nominal value × 85%-0.1
 
5, armor or shield sheath thinnest point: nominal value × 80%-0.2
 
6, steel wire armoured: root number ={π× (inner diameter of jacket + wire diameter)} wire diameter ×λ) ÷ ( weight = π× wire diameter sq 2 ×ρ×L × root number ×λ 
 
7, insulation and sheath weight = π×(squeeze the OD + thickness) * thickness * L * ρ
 
8, steel tape weight = {π×( wrapped before outer diameter +2 × thickness -1) x 2 x thickness ρ×L } /(1+K)
 
9, package belt weight = {π×(before wrapped outer diameter + layers * thickness) * Number * thickness * ρ * L / (1 + k), in which: K is the ratio of overlap or gaps, such as overlapping, 1-k; if it is gap, it is 1 + K; ρis the proportion of the material; L is the length of the cable; λ is twisted number.
 

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