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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 : 8SIS-3320
SKU : 8SIS-3320-250-GY
This 8 AWG UL 3320 hook-up wire is a robust internal wiring solution designed for high-current industrial applications. Built with chemically cross-linked polyethylene (XLPE) insulation, this wire provides a high-durability "thermoset" jacket that resists environmental stressors and thermal cycling better than standard thermoplastic materials.
UL 3320 is a specialized standard frequently utilized for lead wire in heavy-duty electrical equipment. The 8-gauge conductor offers significant current-carrying capacity for power distribution, while the XLPE insulation ensures the wire maintains its electrical properties without softening or deforming under heat. This makes it a preferred choice for internal connections in motors, transformers, and industrial control systems.
Advanced XLPE Insulation: The cross-linked polyethylene jacket provides superior dielectric strength and exceptional resistance to environmental stress cracking and moisture.
90C Temperature Rating: Engineered for continuous, reliable operation in environments up to 90C (194F).
Tinned Copper Conductor: Features annealed tinned copper strands that offer excellent conductivity and maximum protection against corrosion and oxidation at the termination points.
Mechanical Ruggedness: Highly resistant to abrasion, cut-through, and crushing, which is critical for high-vibration industrial environments.
Chemical Resistance: The XLPE insulation remains stable when exposed to common industrial oils, acids, alkalis, and solvents.
Standard Compliance: Fully meets the requirements for UL Style 3320 and is rated for 600V service.
Conductor Size: 8 AWG
Stranding: 133/29 (High Flexibility)
Voltage Rating: 600V
Temperature Rating: 90C (194F)
Insulation Material: Cross-linked Polyethylene (XLPE)
Insulation Thickness: 0.060 inches (1.52 mm)
Nominal Outer Diameter: 0.285 inches (7.24 mm)
Approvals: UL 3320
Heavy-Duty Motor Leads: Ideal for internal connections in mid-to-large scale electric motors and generators.
Transformer Lead Wire: Used for internal wiring and lead-outs in dry-type transformers.
Industrial Control Panels: Preferred for high-ampacity power routing within control cabinets and switchgear.
Power Supplies: Suitable for high-current internal wiring in industrial power conversion equipment.
Technical Note: All dimensions and stranding counts are nominal and may vary slightly by manufacturer. UL 3320 is intended for the internal wiring of equipment and is not approved for use as a portable cord or for structural building wiring.
SPECIFICATION: UL Style 3320
| Wire Size (AWG/MCM) | 8 AWG |
| Conductor Material | Tinned Copper |
| Conductor Type | Stranded |
| Strand Count | 133 |
| Outer Diameter (OD) (in/mm) | 0.230 in. / 5.84 mm |
| Conductor Count | 1 |
| Shield | Unshielded |
| Insulation Type | XLPE |
| UL Listing Numbers | UL 3320, UL 44, UL 758 |
| Voltage Rating | 600V |
| Submersible | No |
| Temperature Rating | 90ºC |
| Standards | UL 44 VW-1 Flame Test, UL 758 Style 3320 NEC Type SIS NEMA SG 5 |
| Miscellaneous Information | All values are nominal and subject to correction. |
| Primary Applications | Switchboards, Control and Power Circuits, Applications up to 90° and 600 volts. |
| Common Uses |
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| Weight per Foot | 0.057 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
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UL 3320 is engineered for high-reliability internal wiring in appliances and motor leads. Its 90°C thermal rating and durable XLPE insulation make it a preferred choice for control panels, transformers, and switchboard applications where long-term thermal stability is critical.
The copper part of an 8 AWG wire is about the thickness of a heavy-duty drinking straw. It’s much thicker than the wire on your vacuum cleaner or microwave. It’s built to be the "main power line" inside a big machine, carrying enough electricity to run large motors or heating systems.
It is still high-quality copper, but it has been "Tinned" with a silver-colored coating. Think of it like galvanized steel; the tin acts as a shield that prevents the copper from "rotting" or corroding over time. This is especially important in machines that get hot, as heat usually makes copper corrode much faster.
This wire uses XLPE, which is like the "heavy-duty" version of plastic. While standard wire insulation can be soft and easily nicked, XLPE is chemically toughened. It's designed to be pulled through metal holes and clamped down into heavy machinery without the insulation getting crushed or flattened out.
Yes, 8 AWG is a very popular size for powering amplifiers and small solar banks. Because this specific wire is UL-rated and has the tougher XLPE insulation, it’s actually a safer choice than "budget" car audio wire, which often has thin, soft insulation that can melt easily.
Because it's rated for 90°C (194°F), it can handle temperatures nearly as hot as boiling water without a problem. The "Cross-Linked" insulation is the key here—even if it gets very hot, it won't melt or drip like a plastic bag would. It stays solid and keeps the electricity where it belongs.
The tinned coating on the copper strands provides two major advantages: it prevents oxidation (corrosion) in humid or marine environments and significantly improves "solderability." This makes the 8 AWG UL 3320 ideal for applications requiring frequent soldering or terminations in high-moisture settings.
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