MV-105 3/C 250 kcmil 15 kV 133 % EPR
Nominal calculation, not one manufacturer's datasheet. The conductor is NEC Chapter 9 Table 8; the walls are the ICEA nominals as Okonite and Southwire reproduce them, the screens and the jacket the values six makers print or give through their diameters, because UL 1072 and ICEA S-93-639 were not read. Check the datasheet before you specify or order.
By NEC Table 8 and the catalogued walls, MV-105 3/C 250 kcmil 15 kV 133 % EPR comes to an overall diameter of about 67.3 mm and a weight of about 7,260 kg/km.
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Main dimensions
| Conductor | Copper 250 kcmil (127 mm²), Ø 14.2 mm | compressed Class B: ICEA S-94-649 Table C-4 as Elastimold prints it; below 2 AWG NEC Table 8 x 0.97 (its note) |
|---|---|---|
| Insulation | EPR 5.59 mm | MV-105 insulation: the ICEA nominal wall of its class and level, as Okonite and Southwire reproduce it (UL 1072 / ICEA S-93-639 not read) |
| Diameter over insulation | 26.5 mm | |
| Core diameter | 28.5 mm | |
| Overall diameter | 67.3 mm | |
| Weight (approximate) | 7,260 kg/km |
Layer by layer (inside out)
| # | Layer | Material | Thickness mm | Ø over mm | Source | How firmly |
|---|---|---|---|---|---|---|
| 1 | Conductor screen (semicon) | Semiconducting | 0.58 | 15.3 (on each core) | MV-105 strand screen: 19 mil to 4/0, 23 at 250 to 500, 28 at 600 to 1000 kcmil; derived from Southwire diameters, no maker prints it | maker catalogue value, standard text not read |
| 2 | Insulation | EPR | 5.59 | 26.5 (on each core) | MV-105 insulation: the ICEA nominal wall of its class and level, as Okonite and Southwire reproduce it (UL 1072 / ICEA S-93-639 not read) | maker catalogue value, standard text not read |
| 3 | Insulation screen (semicon) | Semiconducting | 0.76 | 28.0 (on each core) | MV-105 insulation screen 30 mil: Southwire (derived) and the commonest Okonite value | maker catalogue value, standard text not read |
| 4 | Tape screen | Copper | 0.25 | 28.5 (on each core) | MV-105 copper tape: 5 mil, 25 % overlap, adding 20 mil to the diameter (Southwire, Prysmian, Priority, LS Cable) | maker catalogue value, standard text not read |
| 5 | Filler | PP | fills the space between the cores | 61.5 | ||
| 6 | Separation tape | Polyester | 0.10 | 61.7 | typical polyester tape | typical value, no rule |
| 7 | Sheath | PVC | 2.79 | 67.3 | MV-105 three-conductor PVC jacket by the diameter under it: 80 mil to about 1.6 in, 110 to about 2.5 in, 140 above (Okonite, Prysmian; Southwire 135) | maker catalogue value, standard text not read |
MV-105 is the UL 1072 medium voltage cable of NEC Article 311, here as a single copper conductor or three with a ground: an extruded strand screen, EPR insulation at the wall of its class and level (100, 133 or 173 %), an extruded insulation screen, a 5 mil copper tape at 25 % overlap and a PVC jacket; the three-conductor cable lays three such cores with a bare copper ground in an interstice, fillers and a binder tape under its jacket. MV-90 has the same walls. Checked against Southwire, Okonite, Prysmian, AmerCable, LS Cable and Priority Wire: research/designer-americas/mv105.md in the site repository.
Materials in this cable: Copper, PVC, Semiconductive compound, Rubber (EPR, silicone)
Weight, by part
| Conductors | 3,830 kg/km |
| Metal screens and armour | 280 kg/km |
| Insulation, semicon, tapes, fillers and sheaths | 3,140 kg/km |
| Total | 7,260 kg/km |
|---|
Each layer's cross-section times its density; stranded conductors, laid-up cores and helical wires count 2 % longer than the cable. Densities: copper 8.89 and aluminium 2.703 g/cm³ (the values of IEC 60028 and IEC 60889); XLPE 0.92, PE 0.94, PVC 1.45, semicon 1.12, steel 7.85 g/cm³ (usual compound values).