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The 15kV Concentric Neutral Cable (100% Insulation - 0.175") with One-Third Neutral is a medium-voltage power cable featuring thermoset insulation (XLPE or EPR), concentric semi-conducting shields, and one-third size bare copper concentric neutral wires. It is designed for solidly grounded distribution systems where reduced neutral sizing is acceptable due to limited ground fault current or the use of other grounding strategies.
Voltage Rating: 15kV
Insulation Level: 100% (for solidly grounded systems)
Insulation Thickness: 0.175 inch (4.45 mm)
Neutral: One-third concentric copper neutral
Temperature Rating: 90°C (normal), 130°C (emergency), 250°C (short-circuit)
This cable is used in:
Solidly grounded primary distribution networks
Underground power feeders to switchgear, pad-mounted transformers, and substations
Installations where ground fault current levels are low or well controlled
Applications where a full-size neutral is not required by code
Direct burial, duct bank, tray, or conduit
The one-third size concentric neutral is often used where:
Neutral current is low (i.e., balanced 3-phase loads)
An equipment ground conductor (EGC) is present
Cost and weight reduction is desired
| Standard | Scope |
|---|---|
| ICEA S-94-649 | Shielded power cables rated 5-46kV with concentric neutrals |
| AEIC CS8 | Medium-voltage cables with thermoset insulation |
| UL 1072 | UL safety standard for MV power cables |
| IEEE 1202 / 383 | Flame test (for jacketed cables) |
| ICEA T-28-562 | Grounding of concentric neutral and shielding guidelines |
| ASTM B3 / B8 / B33 | Specifications for copper conductors and concentric wires |
| RoHS / REACH | Environmental compliance with hazardous substances |
| Component | Description |
|---|---|
| Conductor | Stranded copper or aluminum, Class B, per ASTM B8 |
| Conductor Shield | Thermoset extruded semi-conductive layer |
| Insulation | XLPE or EPR, thickness: 0.175″ (4.45 mm), for 100% insulation level |
| Insulation Shield | Extruded thermoset semi-conductive layer |
| Concentric Neutral | One-third ampacity-sized bare copper wires, helically applied |
| Binder Tape | Optional, non-hygroscopic binding over the neutral layer |
| Jacket (Optional) | PVC, PE, or LSZH - for mechanical, UV, and flame protection |
| Markings | Printed with voltage rating, cable type, insulation level, etc. |
| Characteristic | Value |
|---|---|
| Voltage Rating | 15kV |
| Insulation Level | 100% (for solidly grounded systems) |
| Insulation Thickness | 0.175″ (4.45 mm) |
| Conductor Temperature | 90°C (normal), 130°C (emergency), 250°C (short circuit) |
| Neutral Configuration | One-third size bare copper concentric wires |
| Installation Methods | Direct burial, duct, tray, or conduit |
| Jacket Options | PVC / PE / LSZH for UV, flame, and abrasion resistance (optional) |
| Flame Resistance | Meets IEEE 1202 or ICEA T-29-520 (for jacketed cables) |
| Parameter | Specification |
|---|---|
| Cable Type | 15kV Concentric Cable (One-Third Neutral) |
| Conductor | Copper or Aluminum |
| Insulation Material | XLPE or EPR |
| Insulation Thickness | 0.175″ (100% insulation level) |
| Neutral Type | One-third size bare copper concentric wires |
| Temperature Rating | 90°C / 130°C / 250°C |
| Outer Jacket | Optional: PVC, PE, or LSZH |
| Standards | ICEA, AEIC, UL, IEEE |
| Applications | Solidly grounded systems, duct or direct burial |
The 100% insulation level is only suitable for solidly grounded systems.
One-third neutral is commonly used with a separate equipment ground conductor (EGC) in:
Multi-conductor installations
Configurations with low fault current risk
Code compliance may require analysis based on fault duty, cable length, and system grounding.
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