| Customization: | Available |
|---|---|
| Application: | Underground |
| Voltage: | Low and Medium Voltage Cable |
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The 35kV Concentric Neutral Cable (100% insulation - 0.345") with One-Third Neutral is a medium-voltage, shielded power cable designed for use in solidly grounded electrical systems. It features a stranded conductor (typically copper), cross-linked polyethylene (XLPE) insulation, semi-conductive layers, and a concentric layer of bare copper wires that act as the ground/neutral path. The neutral wires are sized to one-third the ampacity of the conductor, which reduces material cost and weight in systems where full neutral is not required.
Voltage Class: 35kV (phase-to-phase)
Insulation Level: 100% (for solidly grounded systems)
Insulation Thickness: 0.345" (8.76 mm)
Neutral Configuration: One-third ampacity bare copper wires
Temperature Rating: 90°C (normal), 130°C (emergency), 250°C (short-circuit)
This cable is used in:
Solidly grounded medium-voltage power distribution systems
Utility primary underground feeders
Substations and large industrial power systems
Installations requiring reduced neutral size and cost efficiency
Direct burial, duct bank, tray, or conduit systems
One-third neutral is suitable when:
Ground fault return paths are limited or separately provided
A dedicated equipment grounding conductor (EGC) is installed
The system is three-phase balanced with limited unbalanced or neutral current
| Standard | Description |
|---|---|
| ICEA S-94-649 | Power cables rated 5kV - 46kV with concentric neutral |
| AEIC CS8 | Thermoset-insulated medium-voltage cables |
| UL 1072 | UL safety standard for MV power cables |
| IEEE 1202 / 383 | Flame tests for cables with jacket |
| ASTM B3 / B8 / B33 | Copper conductor and concentric wire standards |
| ICEA T-28-562 | Grounding recommendations for MV concentric neutral cables |
| RoHS / REACH | Environmental material compliance |
| Component | Specification |
|---|---|
| Conductor | Stranded copper (Class B) per ASTM B8 |
| Conductor Shield | Extruded semi-conductive thermoset compound |
| Insulation | Cross-linked polyethylene (XLPE) or EPR, thickness: 0.345" (8.76 mm) |
| Insulation Shield | Extruded semi-conductive thermoset material |
| Concentric Neutral | Bare copper wires, helically applied, sized to one-third conductor ampacity |
| Separator/Binder | Optional non-hygroscopic tape |
| Jacket (optional) | PVC, PE, or LSZH - provides UV, flame, and moisture resistance |
| Markings | Printed or embossed with voltage class, size, insulation level, and manufacturer |
| Parameter | Value |
|---|---|
| Voltage Rating | 35kV (phase-to-phase) |
| Insulation Level | 100% - for solidly grounded systems |
| Insulation Thickness | 0.345″ (8.76 mm) |
| Neutral Configuration | One-third ampacity, bare copper concentric wires |
| Temperature Ratings | 90°C (normal), 130°C (emergency), 250°C (short-circuit) |
| Flame Performance | Meets IEEE 1202 / ICEA T-29-520 (if jacketed) |
| Installation Methods | Direct burial, conduit, duct bank, tray |
| Conductor Options | Copper (standard); aluminum (optional for some designs) |
| Attribute | Specification |
|---|---|
| Cable Type | 35kV Concentric Cable (100% - 0.345") with One-Third Neutral |
| Conductor Material | Stranded Copper |
| Insulation | XLPE or EPR |
| Insulation Thickness | 0.345″ (8.76 mm) |
| Neutral | One-third concentric bare copper wires |
| Max Operating Temp | 90°C continuous, 130°C emergency, 250°C short-circuit |
| Installation | Direct burial, tray, conduit, duct |
| Use Case | Solidly grounded 35kV systems with limited neutral current |
| Standards | ICEA S-94-649, AEIC CS8, UL 1072, IEEE 1202, ASTM |
100% insulation level is only acceptable for solidly grounded systems.
If used in ungrounded or impedance-grounded systems, a 133% insulation level is required.
A One-third neutral may not be sufficient to carry fault current in all applications. Always validate with protection coordination and grounding design.
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