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OPGW Galvanized Steel Ground Wire
Material: Zinc coated galv. steel wire for optical ground wire ( OPGW ) coring.
Resistivity :Typical value of galvanized steel wire is 0,19157 Ωmm² /m.
Torsion Test : The specimen shall be twisted untill fracture occurs by applying for not exceeding 2% of the breaking strength.
The rate of twisting shall not exceed than 60 rev/min.
Zinc coating mass requirements
| wire diameter mm. | min.mass of zinc coating g/m² class 1 |
| 1,24 < 1,50 | 200 |
| 1,50 < 1,75 | 215 |
| 1,75 < 2,25 | 230 |
| 2,25 < 3,00 | 245 |
| 3,00 < 3,50 | 260 |
| 3,50 < 4,25 | 275 |
| 4,25 < 4,75 | 290 |
| 4,75 < 5,50 | 305 |
Mechanical properties,torsion twist requirements and wrap test mandrel diameter for extra high strength steel wires
| Nominal wire diameter mm. | Diameter tolerance | min.stress at 1% extansion Mpa | min.ultimate tensile stress Mpa | min.ultimate elongation % | Mandrel dia.for wrapping test (x.OD) | min.number of twist in torsion test |
| Class 1 zinc coating | ||||||
| 1,24 < 2,25 | +/- 0,03 | 1470 | 1670 | 3,0 | 4 | 18 |
| 2,25 < 2,75 | +/- 0,04 | 1473 | 1630 | 3,0 | 4 | 18 |
| 2,75 < 3,00 | +/- 0,05 | 1430 | 1630 | 3,5 | 5 | 16 |
| 3,00 < 3,50 | +/- 0,05 | 1400 | 1600 | 4,0 | 5 | 16 |
| 3,50 < 4,25 | +/- 0,06 | 1360 | 1570 | 3,5 | 5 | 14 |
| 4,25 < 4,75 | +/- 0,06 | 1360 | 1570 | 3,5 | 5 | 14 |
| 4,75 < 5,50 | +/- 0,07 | 1290 | 1550 | 3,5 | 5 | 14 |
Initial stress and extensometer setting for determination of stress 1% extension
| Actual diameter mm. | Initial stress Mpa | Initial setting of extensometer ( gauge length 250 mm.) |
| 1,24 < 2,25 | 100 | 0,125 |
| 2,25 < 3,00 | 200 | 0,250 |
| 3,00 < 4,75 | 300 | 0,375 |
| 4,75 < 5,50 | 400 | 0,500 |
