12/3 Extension Cord 

If you're shopping for a 12/3 extension cord, you're probably working on a project that needs real power. Whether you are building out a workshop, setting up equipment on a job site, or running a long cable run for outdoor tools, the right 12/3 wire makes a noticeable difference. 

Get it wrong, and you're looking at tripped breakers, damaged equipment, or worse. Get it right, and your circuit runs clean and safe for years. 

At Americord, this collection of bulk cable options in 12/3 covers a wide range of applications. Each product is sold by the foot or in bulk rolls, giving contractors, electricians, and DIYers the flexibility to cut exactly what they need.  

Browse this 12/3 extension cord collection page to learn each product’s jacket type, color, Amperage rating, and approval markings. 

What Is A 12/3 Extension Cord? 

A 12/3 extension cord is a three-conductor, 12-gauge cord that can safely carry higher Amp loads. It features three conductors (hot, neutral, ground) and is commonly used for heavy-duty tools, appliances, or long-distance power in both indoor and outdoor settings.  

The first number, 12, indicates the wire gauge as per the American Wire Gauge (AWG) system. Smaller gauge numbers indicate thicker wire. A 12-gauge wire is thicker than a 14-gauge wire and carries more current with less resistance. 

The second number, 3, indicates how many conductors are in the cord. For a typical 3-wire 12-gauge cord, they are the hot wire (black), the neutral wire (white), and the ground (green or bare copper). The ground wire makes it an extension cord rather than a two-conductor cable and is important for safety, especially in commercial or industrial environments. 

12/3 Amp Rating: How Much Can It Handle? 

It depends on the cable. A 12-gauge wire is rated to safely carry 20 Amps in most types of cord and cable, although some are rated for 25 Amps based on their construction and insulation rating. A few are rated for 20 Amps. 

If you are wondering "how many Amps does a 12/3 extension cord carry?", the answer is generally 20 to 25 Amps at 300V for most SJTOW variety cords, and 20 Amps at 600V for the heavier-duty SOOW and STOW types. The voltage rating matters because a higher-rated insulation can handle more rugged environments, not just higher voltage. 

For a 100 ft. 12/3 extension cord run, keep in mind that resistance increases with length, which will cause some small voltage drop. If your run is over about 50 feet under heavy load, then you may want to use one of the two alternatives below: 

Americord 12/3 Bulk Wire Products 

Americord has a distinct bulk 12/3 extension cord wire option, and this collection provides a detailed breakdown for each, and what it is best suited for. 

12/3 SJTOW Black 105C 25 Amp 300V NA PVC Thermoplastic Bulk Cable 

The 12/3 SJTOW Black 105C 25 Amp 300V NA PVC Thermoplastic Bulk Cable is the go-to option for general-purpose applications that require solid 25 Amp capacity. Its jacket is oil- and weather-resistant, making it suitable for both indoor and outdoor use.  

Rated to 105 degrees Celsius, it holds up in warmer conditions without degrading. Black color is standard for job sites and industrial settings. Approved for the North American market. 

12/3 SJTOW White 105C 25 Amp 300V NA PVC Thermoplastic Bulk Cable 

The 12/3 SJTOW White 105C 25 Amp 300V NA PVC Thermoplastic Bulk Cable shares the same specs as the black version. That is, 25-Amp capacity, 300V, 105 °C rating, SJTOW oil- and weather-resistant jacket, but in white color.  

White-jacketed cable is common in retail fixtures, display equipment, and environments where cord color needs to blend in. It has the same high-performance PVC thermoplastic construction and North American approval as the black version. 

12/3 SJTOW Neon Pink 105C 25 Amp 300V NA PVC Thermoplastic Bulk Cable 

The 12/3 SJTOW NEON PINK 105C 25 Amp 300V NA PVC Thermoplastic Bulk Cable is perfectly suited for work environments where visibility matters. This cable carries the same 25-Amp, 300V, 105 °C rating and SJTOW-rated jacket as the other colors in the family.  

It is a practical option for environments where you need to quickly spot a cord, such as a busy floor, an event venue, or a space shared with foot traffic. 

12/3 SJTOW Neon Green 105C 25 Amp 300V NA PVC Thermoplastic Bulk Cable 

Neon green stands out in any setting, and the 12/3 SJTOW NEON GREEN 105C 25 Amp 300V NA PVC Thermoplastic Bulk Cable never disappoints. Rated for 25 Amps, 300V, and 105 °C with the same oil and weather-resistant SJTOW jacket, this cable works where cord identification is a priority.  

Common uses include rental equipment, stage setups, and any situation where trip hazards need to be visible from a distance. The Americord neon green option is built to the same quality standard as the full SJTOW line. 

12/3 SOOW Black 90C 20 Amp 600V NA Heavy Duty Rubber Bulk Cable 

The 12/3 SOOW Black 90C 20 Amp 600V NA Heavy Duty Rubber Bulk Cable is where things step up quite significantly. The SOOW designation means this cable has a rubber jacket rather than PVC, making it more flexible in cold weather and offering better abrasion resistance.  

Rated 600V and 20 Amps, it's a heavy-duty extension cord for industrial/outdoor-temp power connections that need to last. The 90 °C temperature rating reflects the natural properties of rubber insulation. It’s one of those cables that can withstand serious abuse. 

12/3 SJTOW Yellow 105C 20 Amp 300V NA PVC Thermoplastic Bulk Cable 

The 12/3 SJTOW Yellow 105C 20 Amp 300V NA PVC Thermoplastic Bulk Cable has one of the most recognized colors for extension cords in professional settings. This option from Americord carries a 20-Amp rating at 300V, with the standard SJTOW PVC thermoplastic jacket rated to 105 °C. It's an everyday, practical workhorse that can handle rough use in shops, garages, and job sites. The bright yellow color makes it easy to see and follow across a crowded work floor. 

12/3 SJOOW Black 90C 20 Amp 300V NA Rubber Bulk Cable 

The SJOOW Black 90C 20 Amp 300V NA Rubber Bulk Cable is much like the SOOW, but is rated at 300V instead of 600V. It also has a rubber jacket, which makes it extremely flexible and tough in cold, wet environments.  

At 20 Amps and 90 °C, this works great for commercial and industrial applications that require a rubber construction but don't require the full 600V capacity. Best option if you want the most flexibility but will never need high-voltage capabilities. 

12/3 STOW Black 105C 20 Amp 600V NA Heavy Duty PVC Thermoplastic Bulk Cable 

The 12/3 STOW Black Bulk Cable combines the high-temperature tolerance of PVC thermoplastic (105 °C) with a 600V rating and a heavy-duty construction. It’s built for demanding applications that require more insulation capacity than standard SJTOW cords offer 

At 20 Amps and 600V, this works well for machinery connections in an industrial setting, commercial installations, or any application where a higher-voltage jacket is specified. Available from Americord in black color for regular industrial use. 

12/3 SJTOW Black 105C 20 Amp 300V CEE PVC Thermoplastic Bulk Cable 

The 12/3 SJTOW Black 105C 20 Amp 300V CEE PVC Thermoplastic Bulk Cable is CEE-approved rather than the standard North American listing. CEE-approved cables meet European connector and safety standards. 

This makes it ideal for international equipment, imported tools, or projects that require CEE-compliant wiring. It carries a 20-Amp rating at 300V with the same 105 °C thermoplastic jacket found across the SJTOW line. 

12/3 SJEOW Black 105C 20 Amp 300V NA Rubber Bulk Cable 

The 12/3 SJEOW Black 105C 20 Amp 300V NA Rubber Bulk Cable is built for outdoor use in harsh conditions. The rubber jacket, combined with a 105 °C temperature rating, gives this cable a wide operating range.  

At 20 Amps and 300V with North American approval, it fits outdoor equipment setups, portable tool applications, and any job where the cable will be exposed to the elements or rough surfaces. The rubber build keeps it pliable even in cold weather, unlike PVC cords, which can stiffen. 

How to Choose the Right 12/3 Wire for Your Job 

What really matters when you're looking for a 12/3 extension cord for a specific task, given 10 items in the collection? Here's what to consider. 

• Jacket material: PVC thermoplastic (SJTOW, STOW) will suffice for indoor and most outdoor uses. If you need the cable to handle heavy abrasion or direct burial in sunlight, go with a rubber jacket (SOOW, SJOOW, SJEOW) 
• Amperage: Match the cord's Amperage rating to your machine's rating. The 25-Amp SJTOW cords are preferable since circuits are often loaded close to capacity. 
• Voltage rating: 300V is fine for most general uses, while insulation near industrial machinery, generators, or equipment requiring a higher-rated insulation can be found in the 600V SOOW or STOW 
• Color: Go for black or yellow if you need it for a construction site. High visibility neon pink or neon green if you’re going to use it for events, rentals, or in safety-sensitive areas. White if it’s for display or retail fixtures 
• Approvals: North American (NA) approval covers standard U.S. and Canadian applications. The CEE version applies to international equipment with European connector standards. 

According to the U.S. Consumer Product Safety Commission (CPSC), misuse of extension cords is a leading cause of electrical fires and injuries. One of the easiest steps you can take to help stay safe is selecting the right gauge and Amperage rating for your application. 

Why Buy 12/3 Extension Cord Wire in Bulk? 

Bulk wire offers you flexibility. Instead of buying a pre-cut cord in a specific length, you purchase 12/3 extension cord wire by the foot and cut it to the exact length your application requires. This is more cost-effective on larger jobs, reduces waste, and lets you finish the ends with terminations that best accommodate your tools. 

The Occupational Safety and Health Administration (OSHA) sets clear rules for selecting cords and cables in the workplace. Using properly rated bulk wire and assembling cords that meet those ratings is part of staying compliant on commercial and industrial job sites. 

For electricians, contractors, and rental outfits that build their own cord sets, buying bulk from Americord also means you get consistent quality across every foot of wire, not a mix of sourcing from different manufacturers. 

Related Collections at Americord 

If you're browsing the cable 12/3 collection and need something with a similar feel, Americord has several other collections that may interest you. 

• 10-gauge bulk wire for higher Amperage applications 
• 14-gauge bulk wire for lighter-duty cord sets 
• Heavy-duty extension cords featuring pre-molded connectors that are always ready to use 
• Outdoor extension cords are available in different gauges and lengths 
• GFCI protection devices for wet environments 

Whether you are sourcing for a one-time project or keeping your supply stocked for ongoing work, Americord makes it easy to find and order exactly what you need.