From $0.20/ft
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Solid THHN/THWN-2 WireFrom $0.20/ft -
Solid THHN/THWN-2 WireFrom $0.20/ft - Solid THHN/THWN-2 WireFrom $0.20/ft
- Solid THHN/THWN-2 WireFrom $0.20/ft
Parent SKU : THN400AL
SKU : THN400AL-250-BK
"The industry standard for lightweight, cost-effective subpanel feeds, commercial equipment power connections, and branch circuit wiring. Engineered for reliable power distribution inside conduit and raceways, this 400 MCM compact-stranded aluminum wire features triple THHN (dry), THWN-2 (wet), and CSA T90 temperature ratings. Protected by a heat- and moisture-resistant PVC insulation and a slick, abrasion-resistant nylon outer jacket, it pulls smoothly without requiring pulling lubricant. Sold custom cut by the foot or in bulk spools."
400 MCM Aluminum THHN/THWN-2/T90 electrical wire delivers dependable 600V power distribution for secondary panels, heavy equipment, and branch circuits at a fraction of the weight and cost of copper conductors. Designed for installation in conduit, cable trays, and approved raceways, it provides a reliable, code-compliant solution for commercial buildings, workshop circuits, and agricultural equipment. Featuring compact-stranded AA-8000 series aluminum alloy conductors, 400 MCM THHN offers exceptional flexibility and long-term connection reliability. The durable PVC insulation and slick nylon jacket provide high resistance against heat, moisture, gasoline, oil, and mechanical friction during tough conduit pulls.
Dual 90°C Wet/Dry Rating: Dual-rated as THHN for dry locations up to 90°C and THWN-2 for wet or dry locations up to 90°C (600V maximum).
AA-8000 Series Aluminum Alloy: Manufactured with high-grade compact-stranded AA-8000 series aluminum for dependable electrical conductivity, reduced weight, and easier handling.
Cable Tray (CT) Approved: Approved for use in cable trays (1/0 AWG and larger) as well as conduit and raceways.
Low-Friction Nylon Outer Jacket: Abrasion-, heat-, and moisture-resistant PVC insulation encapsulated in a clear, slick nylon jacket that allows installation without pulling lubricant.
Cut to Length by the Foot: Order only the exact footage required for your run, eliminating jobsite waste and unused spools.
Application: General-purpose 600V building wire applications in commercial feeders, high-amp equipment connections, cable trays, or rewiring for wet or dry locations.
Conductor Size: 400 MCM (kcmil).
Conductor Material: Compact Bare AA-8000 Series Aluminum (Class B Stranded).
Conductor Diameter: 0.659 inches.
Voltage Rating: 600 Volts Maximum.
Insulation Material: Polyvinyl Chloride (PVC).
Insulation Thickness: 0.060 inches.
Jacket Material: Clear Abrasion, Heat, & Moisture-Resistant Nylon.
Jacket Thickness: 0.008 inches.
Overall Diameter: 0.795 inches.
Net Weight: 478 lbs per 1,000 ft.
Ampacity (60°C Conductor Rating - NEC): 225 Amps.
Ampacity (75°C Conductor Rating - NEC): 270 Amps.
Ampacity (90°C Conductor Rating - NEC): 305 Amps.
Compliance & Standards: UL 83, UL 1685, CUL, CSA C22.2 No. 75 (T90), CT Use Rated (1/0 & larger), NEC, CEC, NEMA WC-70/ICEA S-95-658, ASTM B800, ASTM B801, ASTM B836, Federal Spec AA-59544, VW-1/FT1 Flame Test, Sunlight Resistant, Gas & Oil Resistant II.
Commercial & Industrial Main Feeders: Main feeder circuits supplying power from primary service equipment to major distribution panels, switchboards, and heavy subpanels in commercial and industrial facilities.
Heavy Industrial Equipment & Machinery Feeds: Power runs for heavy commercial chillers, large industrial HVAC systems, manufacturing machinery, and high-amp transformer connections.
Cable Tray & Underground Conduit Runs: High-capacity power distribution pulled through PVC, EMT, or rigid metal conduit, or installed in overhead industrial cable trays.
Utility & Renewable Energy Systems: Main feeder circuits for commercial solar power combiner boxes, agricultural complex distribution hubs, and secondary utility power connections.
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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.
**Ampacities shown are for general use as specified by the National Electrical Code 2017 Edition, Section 310.15 and 240.4(D). Unless the equipment is marked for use at higher temperatures, the conductor ampacities shall be limited to the follwing per NEC 110.14(C): 60°C - When terminated to equipment for circuits rated 100 amperes or less marked for 14 through 1 AWG conductors. 75°C - When terminated to equipment for circuits rated over 100 amperes or marked for conductors larger than 1 AWG. 90°C - THHN dry locations and THWN wet or dry locations for ampacity adjustment purposes using NEC section 310.15.
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| Wire Size (AWG/MCM) | 400 MCM |
| Conductor Material | Aluminum |
| Conductor Type | Stranded |
| Outer Diameter (OD) (in/mm) | 0.795 in. / 20.193 mm |
| Conductor Count | 1 |
| Shield | Unshielded |
| Insulation Type | (PVC) Polyvinyl Chloride |
| UL Listing Numbers | UL 83, UL 1685, cUL, CSA |
| Voltage Rating | 600V |
| Ampacity Rating | 305 |
| Submersible | No |
| Sunlight Resistance Rating | Yes |
| Temperature Rating | 90ºC |
| Standards | UL 83, UL 1685, cUL CSA C22.2 No. 75 1/0 & larger are rated for CT use NEC & CEC NEMA WC-70 / ICEA S-95-658 ASTM B800, B801, B836 Federal Specification AA-59544 VW-1/FT1 Flame Test Sunlight resistant / Gas and Oil Resistant II |
| Miscellaneous Information | All values are nominal and subject to correction. **Ampacities shown are for general use as specified by the National Electrical Code 2017 Edition, Section 310.15 and 240.4(D). Unless the equipment is marked for use at higher temperatures, the conductor ampacities shall be limited to the follwing per NEC 110.14(C): 60°C - When terminated to equipment for circuits rated 100 amperes or less marked for 14 through 1 AWG conductors. 75°C - When terminated to equipment for circuits rated over 100 amperes or marked for conductors larger than 1 AWG. 90°C - THHN dry locations and THWN wet or dry locations for ampacity adjustment purposes using NEC section 310.15. |
| RoHS Compliance | Yes |
| Primary Applications | Residential, commercial, and industrial wiring, outlets, switches, and lighting circuits. Internal wiring of machine tools, industrial equipment, and various appliances, control panels and circuits for automation and HVAC systems. |
| Weight per Foot | 0.471 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.
Parent SKU : THN400AL
SKU : THN400AL-250-BK
Parent SKU : THN400AL
SKU : THN400AL-250-BK
"The industry standard for lightweight, cost-effective subpanel feeds, commercial equipment power connections, and branch circuit wiring. Engineered for reliable power distribution inside conduit and raceways, this 400 MCM compact-stranded aluminum wire features triple THHN (dry), THWN-2 (wet), and CSA T90 temperature ratings. Protected by a heat- and moisture-resistant PVC insulation and a slick, abrasion-resistant nylon outer jacket, it pulls smoothly without requiring pulling lubricant. Sold custom cut by the foot or in bulk spools."
400 MCM Aluminum THHN/THWN-2/T90 electrical wire delivers dependable 600V power distribution for secondary panels, heavy equipment, and branch circuits at a fraction of the weight and cost of copper conductors. Designed for installation in conduit, cable trays, and approved raceways, it provides a reliable, code-compliant solution for commercial buildings, workshop circuits, and agricultural equipment. Featuring compact-stranded AA-8000 series aluminum alloy conductors, 400 MCM THHN offers exceptional flexibility and long-term connection reliability. The durable PVC insulation and slick nylon jacket provide high resistance against heat, moisture, gasoline, oil, and mechanical friction during tough conduit pulls.
Dual 90°C Wet/Dry Rating: Dual-rated as THHN for dry locations up to 90°C and THWN-2 for wet or dry locations up to 90°C (600V maximum).
AA-8000 Series Aluminum Alloy: Manufactured with high-grade compact-stranded AA-8000 series aluminum for dependable electrical conductivity, reduced weight, and easier handling.
Cable Tray (CT) Approved: Approved for use in cable trays (1/0 AWG and larger) as well as conduit and raceways.
Low-Friction Nylon Outer Jacket: Abrasion-, heat-, and moisture-resistant PVC insulation encapsulated in a clear, slick nylon jacket that allows installation without pulling lubricant.
Cut to Length by the Foot: Order only the exact footage required for your run, eliminating jobsite waste and unused spools.
Application: General-purpose 600V building wire applications in commercial feeders, high-amp equipment connections, cable trays, or rewiring for wet or dry locations.
Conductor Size: 400 MCM (kcmil).
Conductor Material: Compact Bare AA-8000 Series Aluminum (Class B Stranded).
Conductor Diameter: 0.659 inches.
Voltage Rating: 600 Volts Maximum.
Insulation Material: Polyvinyl Chloride (PVC).
Insulation Thickness: 0.060 inches.
Jacket Material: Clear Abrasion, Heat, & Moisture-Resistant Nylon.
Jacket Thickness: 0.008 inches.
Overall Diameter: 0.795 inches.
Net Weight: 478 lbs per 1,000 ft.
Ampacity (60°C Conductor Rating - NEC): 225 Amps.
Ampacity (75°C Conductor Rating - NEC): 270 Amps.
Ampacity (90°C Conductor Rating - NEC): 305 Amps.
Compliance & Standards: UL 83, UL 1685, CUL, CSA C22.2 No. 75 (T90), CT Use Rated (1/0 & larger), NEC, CEC, NEMA WC-70/ICEA S-95-658, ASTM B800, ASTM B801, ASTM B836, Federal Spec AA-59544, VW-1/FT1 Flame Test, Sunlight Resistant, Gas & Oil Resistant II.
Commercial & Industrial Main Feeders: Main feeder circuits supplying power from primary service equipment to major distribution panels, switchboards, and heavy subpanels in commercial and industrial facilities.
Heavy Industrial Equipment & Machinery Feeds: Power runs for heavy commercial chillers, large industrial HVAC systems, manufacturing machinery, and high-amp transformer connections.
Cable Tray & Underground Conduit Runs: High-capacity power distribution pulled through PVC, EMT, or rigid metal conduit, or installed in overhead industrial cable trays.
Utility & Renewable Energy Systems: Main feeder circuits for commercial solar power combiner boxes, agricultural complex distribution hubs, and secondary utility power connections.
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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.
**Ampacities shown are for general use as specified by the National Electrical Code 2017 Edition, Section 310.15 and 240.4(D). Unless the equipment is marked for use at higher temperatures, the conductor ampacities shall be limited to the follwing per NEC 110.14(C): 60°C - When terminated to equipment for circuits rated 100 amperes or less marked for 14 through 1 AWG conductors. 75°C - When terminated to equipment for circuits rated over 100 amperes or marked for conductors larger than 1 AWG. 90°C - THHN dry locations and THWN wet or dry locations for ampacity adjustment purposes using NEC section 310.15.
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| Wire Size (AWG/MCM) | 400 MCM |
| Conductor Material | Aluminum |
| Conductor Type | Stranded |
| Outer Diameter (OD) (in/mm) | 0.795 in. / 20.193 mm |
| Conductor Count | 1 |
| Shield | Unshielded |
| Insulation Type | (PVC) Polyvinyl Chloride |
| UL Listing Numbers | UL 83, UL 1685, cUL, CSA |
| Voltage Rating | 600V |
| Ampacity Rating | 305 |
| Submersible | No |
| Sunlight Resistance Rating | Yes |
| Temperature Rating | 90ºC |
| Standards | UL 83, UL 1685, cUL CSA C22.2 No. 75 1/0 & larger are rated for CT use NEC & CEC NEMA WC-70 / ICEA S-95-658 ASTM B800, B801, B836 Federal Specification AA-59544 VW-1/FT1 Flame Test Sunlight resistant / Gas and Oil Resistant II |
| Miscellaneous Information | All values are nominal and subject to correction. **Ampacities shown are for general use as specified by the National Electrical Code 2017 Edition, Section 310.15 and 240.4(D). Unless the equipment is marked for use at higher temperatures, the conductor ampacities shall be limited to the follwing per NEC 110.14(C): 60°C - When terminated to equipment for circuits rated 100 amperes or less marked for 14 through 1 AWG conductors. 75°C - When terminated to equipment for circuits rated over 100 amperes or marked for conductors larger than 1 AWG. 90°C - THHN dry locations and THWN wet or dry locations for ampacity adjustment purposes using NEC section 310.15. |
| RoHS Compliance | Yes |
| Primary Applications | Residential, commercial, and industrial wiring, outlets, switches, and lighting circuits. Internal wiring of machine tools, industrial equipment, and various appliances, control panels and circuits for automation and HVAC systems. |
| Weight per Foot | 0.471 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.
Get notified when this product is back in stock
Physical Specifications
Technical Specifications
Usage & Installation:
Packaging & Dimensions:
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400 MCM Aluminum THHN/THWN-2 wire is a single-conductor building wire commonly used for branch circuits, feeders, and service entrance conductors in commercial, industrial, and residential applications. It is designed to be pulled through conduit (PVC, EMT, or rigid metal) or run in cable trays for circuits supplying motors, heavy HVAC units, subpanels, and general branch power.
Under NEC guidelines, 400 MCM aluminum wire is rated at 270 Amps at 75°C and 305 Amps at 90°C (225 Amps at 60°C). When sizing overcurrent protection (circuit breakers) for standard equipment terminals rated at 75°C, 400 MCM aluminum is typically paired with a 250 Amp or 300 Amp breaker rating depending on terminal equipment specifications and circuit requirements.
THHN/THWN-2 is an acronym system defining the wire's insulation materials, temperature ratings, and location approvals under National Electrical Code (NEC) standards:
Yes, but it must be installed inside an approved conduit or raceway (such as Schedule 40/80 PVC, EMT, or Rigid Metal Conduit). Because it carries a dual THHN/THWN-2 rating, the wire is fully rated for wet, damp, and underground conduit locations. However, it is not rated for direct burial straight in earth without conduit—if your project requires direct burial without conduit, you will need a direct-burial cable like URD or USE-2 instead.
Wire America is a trusted supplier of Aluminum THHN/THWN-2 in sizes 8 AWG through 1000 MCM. We ship directly from our strategic regional hubs located across the United States, delivering most orders right to your shop or job site within 2 to 4 business days. We prioritize shipping Aluminum THHN from the warehouse nearest to your job site to keep transit times minimal. Expedited shipping options are available at checkout for time-sensitive contractor deadlines.
Yes, this wire carries a CSA T90 rating in addition to its UL THHN and THWN-2 ratings. T90 is the Canadian Electrical Code (CEC) equivalent rating for single-conductor building wire rated for dry locations up to 90°C (194°F). Because it is multi-rated as THHN, THWN-2, and T90, it is fully code-compliant for installations across both the United States and Canada.
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