1. jacket thickness: pre extrusion diameter × 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. Online measurement of sheath thickness: sheath thickness = (extrusion sheath after the perimeter – extrusion sheath of the perimeter) /2π or sheath thickness = (extrusion sheath after the perimeter – extrusion sheath of the perimeter) x 0.1592

 

3. insulation thickness most thin point: the nominal value × 90%-0.1

 

4. single core sheath most thin point: the nominal value × 85%-0.1

 

5. multi core sheath most thin point: the nominal value × 80%-0.2

 

6. steel wire armoured: number = {π× (inner jacket external diameter)｝÷( steel wire diameter ×λ)

 

Weight = π×steel wire diameter sq ×ρ×L×number×λ

 

7. weight of insulation and sheath = π×(diameter before squeeze thickness )×thickness×L×ρ

 

8. steel tape weight =｛π×(diameter before lapping 2×thickness-1) ×2×thickness×ρ×L｝/(1 K)

 

9. The weight of the package tape =｛π×(diameter before lapping layer number×thickness)×layer number×thickness×ρ×L｝/(1±K)

 

In which: K is overlap rate or clearance rate, if is overlap, it is 1-K; if is clearance, it is 1 K, 

ρ is the proportion of material; L is cable length; λ is stranded coefficient.