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Parent SKU : ALURDWB-35K-300-1/3
SKU : ALURDWB-35K-300-1/3-250
"High-density power distribution for commercial primary service—engineered with tree-retardant XLPE and dual-layer water blocking for superior 35kV grid performance."
The 300 MCM 35kV URD cable is a heavy-duty primary conductor designed for high-ampacity underground distribution. It is frequently specified for commercial primary services and industrial feeders where long-term dielectric stability and maximum current density are required.
Dual-Layer Water Block Protection: Moisture is the leading threat to underground power systems. This cable is manufactured with water-blocking compounds in the conductor core and water-swellable agents in the neutral layer, creating an airtight longitudinal seal against moisture migration.
Tree-Retardant XLPE (TR-XLPE): The 345-mil insulation wall is comprised of premium TR-XLPE. This specialized insulation is engineered to inhibit "water treeing," a process that causes microscopic cracks in standard XLPE, ensuring the cable survives decades in saturated soil.
1/3 Concentric Neutral: Featuring 15 x #14 AWG (or equivalent conductivity) annealed bare copper wires, the 1/3 neutral configuration provides a high-conductivity path for fault currents while maintaining an efficient material profile.
Compact Stranded 1350-H19 Aluminum: The 300 kcmil aluminum conductor is compact-stranded to minimize air gaps and reduce the overall outer diameter, allowing for high-capacity power routing in space-constrained conduits.
Heavy Commercial Feeders: Delivering primary power to large-scale shopping malls, hospitals, and high-rise office complexes.
Industrial Utility Taps: Routing 35kV power from main utility trunks to heavy manufacturing and processing facilities.
Substation Interconnects: Used for medium-range primary connections between utility substation equipment and local distribution networks.
ENGINEERING OVERVIEW: 300 MCM INDUSTRIAL-GRADE DISTRIBUTION The 300 MCM 35kV URD cable is optimized for primary distribution applications requiring extreme durability and high current-carrying capacity. With a nominal outer diameter of approximately 1.78", this cable is built to withstand the rigors of direct burial or duct installation in corrosive and high-moisture environments.
APPLICATION: Aluminum Conductor MV-105 35kV water-blocked URD cable is primarily used for primary underground power distribution. It is suitable for use in wet or dry locations, installed in underground ducts or via direct burial.
CONDUCTORS: 300 MCM (300 kcmil) Compact or compressed aluminum 1350-H19 in Class B stranding.
CONDUCTOR WATER BLOCK: Water block compound filled conductor or water swellable tape over the conductor.
INSULATION: TR-XLPE (Tree-Retardant Cross-Linked Polyethylene) in 100% insulation level (345 Mils).
CONCENTRIC NEUTRAL WATER BLOCK: Semi-conducting water-swellable tape over the insulation shield or water-swellable powder between the concentric neutral strands.
CONCENTRIC NEUTRAL: 15 x #14 AWG (or equivalent) Annealed bare copper wires (1/3 neutral conductivity).
JACKET: Sunlight resistant XLPE, black with three red stripes for easy high-voltage phase identification.
INDUSTRY STANDARDS & COMPLIANCE:
UL 1072: Listed as Type MV-105
ICEA S-94-649: Concentric Neutral Cables Rated 5 through 46kV
AEIC CS8: Shielded Power Cables Rated 5 through 46kV
Temperature Ratings: 105°C (Normal), 140°C (Emergency), 250°C (Short Circuit)
CABLE MARKING: PRIORITY WIRE AL TR-XLPE 35KV 100% INSUL LEVEL 345 MILS (UL) E364254 TYPE MV-105 XLPE WB SUN RES.
Technical Note: All values are nominal and subject to industry tolerances and manufacturer corrections. Specifications are subject to change without notice. It is the buyer’s responsibility to verify that all materials meet the specific requirements of the project and comply with local electrical codes.
| Wire Size (AWG/MCM) | 300 MCM |
| Conductor Material | Aluminum |
| Conductor Type | Stranded |
| Outer Diameter (OD) (in/mm) | 1.78 in. / 45.21 mm |
| Jacket Type | XLPE |
| Conductor Count | 1 |
| Shield | Shielded |
| Insulation Type | TR-XLPE |
| UL Listing Numbers | UL 1072 |
| Voltage Rating | 35kV |
| Direct Burial Rating | Yes |
| Submersible | No |
| Sunlight Resistance Rating | Yes |
| Temperature Rating | 105ºC |
| Standards | ASTM B230 Aluminum 1350–H19 Wire for Electrical Purposes ASTM B231 Concentric-Lay-Stranded Aluminum 1350 Conductors ASTM B400 Compact Round Concentric-Lay-Stranded Aluminum 1350 Conductors ASTM B3 Soft or Annealed Copper Wire UL 1072 Medium-Voltage Power Cables ICEA S-94-649 Concentric Neutral Cables Rated 5 Through 46KV AEIC CS8 Extruded Dielectric, Shielded Power Cables Rated 5 Through 46KV For 105°C continuous, 140°C emergency overload and 250°C short-circuit operation |
| Miscellaneous Information | All values are nominal and subject to correction. Non-stock item available for order |
| Weight per Foot | 1.36 lb |
In-stock orders placed before 3pm EST typically ship within 1-2 business days. Our business days are Monday through Friday; we do not process orders on Saturday, Sunday, or major US Holidays.
You will receive an e-mail with a tracking number within 1-2 business days from the time its shipped. You will also be able to view your order status and tracking numbers in your account order history.
Expedited shipments are delivered Monday-Friday except on US Holidays. The order must be placed before 12pm CST to ship same day ( Mon-Fri Only).
You have 30 days from the day you receive the item to contact us for a return. Returns are subject to a 30% Restocking Fee.
Please contact us at help@wireamerica.com to request a return authorization. Have your order number or name the order was placed with ready and we will email you an RMA (return) number and instructions for return. Currently, we do not offer exchanges. A new order must be placed if you need a different item. If you provide the new order number at the time of your return request, the restocking fee may be lowered.
Orders on any items with a material value of $50 or less are non-returnable.
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Physical Specifications
Technical Specifications
Packaging & Dimensions:
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Under standard conditions (90°C conductor, 20°C earth temperature, and 90 RHO soil resistivity), the ampacity for 300 MCM Aluminum is approximately 310 Amps when direct buried and 255 Amps when installed in an underground duct.
⚠️ CUSTOMER WARNING: Actual ampacity must be calculated based on your specific project conditions, including soil thermal resistivity (RHO), burial depth, duct bank configuration, and load factor per NEC Article 311. Consult a licensed electrical engineer for final system design.
The approximate outside diameter for this cable is between 1.25 and 1.35 inches. For a single cable, a 2-inch or 2.5-inch conduit is typically sufficient. For a triplex installation (three cables twisted together), a 3.5-inch or 4-inch conduit is recommended. Using a larger conduit is often preferred to stay well below the 40% fill limit, which significantly reduces the risk of jammed pulls or jacket damage.
In underground environments, moisture can enter a cable through even the smallest jacket nick. This cable uses swellable water-blocking agents within the conductor strands that expand on contact with water. This prevents moisture from "wicking" or traveling longitudinally down the aluminum conductor. By keeping the conductor dry, the technology prevents the formation of "water trees," which are microscopic cracks in the 35kV insulation that lead to premature dielectric failure.
The 1/3 Neutral indicates that the copper concentric wires provide a total cross-sectional area equal to one-third of the 300 MCM aluminum phase conductor. This is the industry-standard balance for three-phase primary distribution. It provides a reliable return path for fault current and grounding while keeping the cable profile smaller and more flexible than a full-neutral cable, making it easier to pull through tight conduit runs.
To prevent mechanical stress on the 345-mil insulation and the semiconductive shielding layers, you must adhere to the following limits:
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