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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 : 12SIS-3320
SKU : 12SIS-3320-250-BK
This 12 AWG UL 3320 hook-up wire is a high-capacity industrial lead wire designed for applications requiring superior electrical insulation and mechanical toughness. By utilizing chemically cross-linked polyethylene (XLPE) insulation, this wire provides a heat-stable, "thermoset" jacket that maintains its structural integrity under significant current loads and thermal stress.
UL 3320 is an industrial standard for lead wire in heavy-duty motors, transformers, and power supplies. The 12-gauge conductor offers substantial ampacity, fitting perfectly between the heavy-duty 10 AWG and the more compact 14 AWG options. Because the XLPE insulation is cross-linked, it will not melt or shrink back during soldering or under momentary thermal overloads, ensuring a level of safety and reliability that standard PVC cannot match.
Advanced XLPE Insulation: The cross-linked polyethylene jacket provides elite dielectric strength and exceptional resistance to environmental stress cracking.
90C Thermal Rating: Engineered for continuous, reliable operation in environments up to 90C (194F).
Tinned Copper Conductor: Features annealed tinned copper strands that provide high electrical conductivity and maximum protection against corrosion and oxidation at terminal points.
Exceptional Durability: Highly resistant to abrasion, cut-through, and crushing, making it ideal for high-vibration industrial environments.
Chemical & Oil Resistance: The 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: 12 AWG
Stranding: 65/30 (High Flexibility)
Voltage Rating: 600V
Temperature Rating: 90C (194F)
Insulation Material: Cross-linked Polyethylene (XLPE)
Insulation Thickness: 0.045 inches (1.14 mm)
Nominal Outer Diameter: 0.183 inches (4.65 mm)
Approvals: UL 3320
Electric Motor Leads: Preferred for internal wiring of motors where vibration and heat management are essential.
Transformer Lead-Outs: Used for the internal connections and external leads of dry-type transformers.
Industrial Power Distribution: Ideal for routing power within control cabinets and switchgear.
Commercial Appliances: Suitable for the internal wiring of heavy-duty heating and cooling systems.
Technical Note: All dimensions and stranding counts are nominal. UL 3320 is specifically designed 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) | 12 AWG |
| Conductor Material | Tinned Copper |
| Conductor Type | Stranded |
| Strand Count | 65 |
| Outer Diameter (OD) (in/mm) | 0.150 in. / 3.81 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 | 0.023 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
Usage & Installation:
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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.
At the 12-gauge level, the physical weight of the wire and the heat generated by the current can stress standard insulation. XLPE is engineered to handle these forces:
In the electrical world, 12 AWG is a "heavy-hitter." It is the same thickness used for high-power circuits in a home, like kitchen outlets or air conditioners. In a factory setting, it’s used to carry the main power to industrial motors, large heating elements, and internal power supplies.
It is still high-quality copper, but it has been "Tinned." Think of it like galvanized steel; the silver tin coating acts as a shield that prevents the copper from "rusting" (oxidizing) and turning black over time. This is especially important in machines that generate heat, 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 (like on a lamp cord) is soft and can be easily nicked with a fingernail, 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! Because 12 AWG handles significant current and the XLPE insulation is so tough, it’s a popular choice for solar battery banks and automotive power runs. It provides a much higher level of safety against "shorts" compared to budget wires with thin, soft insulation that might vibrate through over time.
90°C (194°F) is nearly the temperature of boiling water. This rating means the wire can sit safely in the "hot zone" of an engine or a large power supply without the insulation becoming brittle or melting. It’s designed for 24/7 industrial use where heat buildup is expected.
While both utilize XLPE insulation and are rated for 600V, the main difference is the temperature rating. UL 3320 is rated for 90°C, whereas UL 3173 is typically rated for 125°C. Use UL 3320 for cost-effective performance in standard temperature environments, and step up to UL 3173 only if your application exceeds 90°C.
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