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Parent SKU : ALURDWB-35K-250-1/3
SKU : ALURDWB-35K-250-1/3-250
"Superior ampacity for heavy-duty utility feeders—engineered with tree-retardant XLPE and dual-layer water blocking for maximum reliability in high-load 35kV underground distribution."
The 250 MCM 35kV URD cable is a large-format primary conductor designed for high-load main feeders and industrial primary services. By utilizing a 250 kcmil aluminum core, this cable provides the robust current capacity required for the "backbone" of modern underground grids.
Dual-Layer Water Block Protection: Engineered to eliminate the risk of "water treeing," this cable features a water-blocking compound within the conductor strands and specialized moisture protection in the neutral layer to prevent longitudinal water migration.
Tree-Retardant XLPE (TR-XLPE): The 345-mil insulation is comprised of premium TR-XLPE, specifically formulated to prevent the growth of electrochemical "water trees" that can lead to catastrophic insulation failure in damp underground environments.
1/3 Concentric Neutral: Featuring 13 x #14 AWG annealed bare copper wires, the 1/3 neutral configuration ensures reliable grounding and fault-current return while maintaining an efficient balance of weight and material cost.
Stranded 1350-H19 Aluminum: The 250 kcmil aluminum conductor is compact-stranded to reduce the overall diameter of the cable, allowing for easier pulls through standard utility ducts without sacrificing ampacity.
Primary Trunk Feeders: Serving as the main high-capacity line from the substation to localized residential or commercial distribution points.
Large Industrial Service: Providing a reliable 35kV primary feed to factories, data centers, and heavy manufacturing facilities.
Utility Grid Expansion: The preferred choice for upgrading existing infrastructure to handle higher current loads in growing urban areas.
ENGINEERING OVERVIEW: 250 MCM HIGH-CAPACITY DISTRIBUTION The 250 MCM 35kV URD cable is optimized for primary distribution applications where maximum current density and environmental resilience are essential. With a nominal outer diameter of approximately 1.73", this cable is engineered for durability in direct burial or duct installations subject to high-moisture and corrosive soil conditions.
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: 250 MCM (250 kcmil) Compact or compressed aluminum 1350-H19 in Class B stranding.
CONDUCTOR WATER BLOCK: Interstitial spaces between conductor strands are filled with a water-blocking compound to prevent moisture migration.
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: 13 x #14 AWG 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) | 250 MCM |
| Conductor Material | Aluminum |
| Conductor Type | Stranded |
| Outer Diameter (OD) (in/mm) | 1.73 in. / 43.94 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 | 1.246 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 250 MCM Aluminum is approximately 275 Amps when direct buried and 225 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 1.15 and 1.25 inches. For a single cable, a 2-inch conduit is standard. For a triplex installation (three cables twisted together), a 3-inch or 3.5-inch conduit is recommended. Staying within these sizes ensures you do not exceed the 40% fill ratio, which protects the cable jacket from excessive friction and "jamming" during the pulling process.
In underground residential distribution (URD), moisture is the most common cause of premature failure. This cable features swellable water-blocking agents within the conductor strands that expand instantly when exposed to moisture. This creates a physical barrier that prevents water from traveling longitudinally through the cable. Without this protection, moisture can lead to "water treeing," where microscopic pathways form in the 35kV insulation, eventually causing a total dielectric breakdown.
The 1/3 Neutral indicates that the copper concentric wires provide a total cross-sectional area equal to one-third of the 250 MCM aluminum phase conductor. This is a common utility standard for three-phase systems where loads are generally balanced. It provides a reliable return path for fault current and grounding while maintaining a smaller overall cable diameter and a lighter weight, which makes it easier to pull through long conduit runs.
To protect the high-voltage insulation and the semiconductive shielding from mechanical damage, you must respect the following limits:
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