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The 15kV Concentric Neutral Cable (133% insulation level - 0.220") with One-Third Neutral is a medium-voltage, shielded power cable featuring a thermoset insulation (XLPE or EPR), extruded semi-conductive shielding layers, and a one-third sized bare copper concentric neutral. It is intended for use in ungrounded or impedance-grounded systems, where higher insulation thickness is required for fault durability, but a reduced neutral is permitted by system design.
Voltage Rating: 15,000 Volts (15kV)
Insulation Level: 133% (for ungrounded or resistance-grounded systems)
Insulation Thickness: 0.220 inches (5.6 mm)
Neutral: One-third size concentric bare copper wires
Temperature Rating: 90°C continuous, 130°C emergency, 250°C short-circuit
This cable is designed for:
Underground primary distribution systems
Ungrounded or resistance-grounded networks
Applications requiring higher dielectric strength (i.e., 133% insulation)
Installations where one-third neutral is sufficient for return path or where a separate ground wire is used
Suitable for direct burial, conduit, duct banks, or tray installations
Using one-third neutral is appropriate when:
The fault current return path is low
A separate equipment grounding conductor (EGC) is present
System design allows neutral reduction without compromising safety
| Standard | Description |
|---|---|
| ICEA S-94-649 | MV power cables with concentric neutral (5-46kV) |
| AEIC CS8 | Thermoset-insulated MV cables |
| UL 1072 | Safety standard for MV power cables |
| ICEA T-28-562 | Concentric neutral grounding requirements |
| IEEE 1202 / IEEE 383 | Flame propagation for jacketed cables |
| ASTM B3 / B8 / B33 | Standards for copper conductors and neutral wires |
| RoHS / REACH | Environmental compliance with hazardous substances regulations |
| Component | Details |
|---|---|
| Conductor | Stranded copper or aluminum, per ASTM B8 |
| Conductor Shield | Extruded thermoset semi-conductive layer |
| Insulation | XLPE or EPR, 0.220″ thick, for 133% insulation level |
| Insulation Shield | Extruded thermoset semi-conductive compound |
| Concentric Neutral | One-third size bare copper wires, helically applied |
| Binder Tape | Optional, applied over concentric wires |
| Outer Jacket (optional) | PVC, PE, or LSZH - protects against moisture, UV, flame, and impact |
| Marking | Includes voltage rating, conductor size, insulation level, manufacturer |
| Characteristic | Specification |
|---|---|
| Voltage Rating | 15kV |
| Insulation Level | 133% - Required for ungrounded or impedance-grounded systems |
| Insulation Thickness | 0.220″ (5.6 mm) |
| Temperature Rating | 90°C (normal), 130°C (emergency), 250°C (short circuit) |
| Concentric Neutral | One-third ampacity copper wires, not rated for full fault current |
| Flame Resistance | Meets IEEE 1202 / ICEA T-29-520 if jacketed |
| Jacket Options | Optional: PVC, PE, LSZH - UV/chemical/flame-resistant |
| Installation Methods | Direct burial, duct, conduit, tray |
| Parameter | Value |
|---|---|
| Cable Type | 15kV Concentric with One-Third Neutral |
| Conductor | Copper or Aluminum |
| Insulation Material | XLPE or EPR |
| Insulation Thickness | 0.220″ (133% insulation level) |
| Neutral Type | One-third size bare copper concentric wires |
| Temperature Rating | 90°C / 130°C / 250°C |
| Jacket | Optional (PVC / PE / LSZH) |
| Installation | Duct, tray, conduit, direct burial |
| Standards | ICEA, AEIC, UL, IEEE, ASTM |
One-third neutral is commonly used in three-phase circuits with balanced loads and where:
A separate ground conductor is installed
Neutral current is minimal or controlled
Cost or weight savings are necessary
Not recommended for single-phase circuits or circuits where the neutral may carry continuous or fault current
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