Water resistant extension cord
When it comes to powering your electrical devices, cords are the unsung heroes behind the scenes. But not all cords are created equal. With a variety of types ranging from heavy-duty outdoor to occasional use indoor cords, it can be difficult to know what to look for. There is where cord ratings come into play.
One of the most common wire and cable ratings is SJTW. But what does this mean? In this post, we’ll explain what SJTW cable is, as well as examine its features and benefits.
SJTW printed on outer jacket of LED high bay power cord.
What is SJTW Cable?
As mentioned above, SJTW is a rating code used for power and extension cords. The code, made of a combination of letters, is stamped on the outer jacket of the cord, allowing for easy identification. Each letter represents a specific feature or jacket makeup. Per the letters, an SJTW rating has the following designations:
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S – Stranded (or service) flexible cord for general use
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J – Hard/Junior service with standard 300 Volt insulation
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T – Vinyl thermoplastic jacket
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W – Weather-resistant, rated for outdoor use and wet locations
This means that SJTW extension cords are hard service cables with a thermoplastic jacket that are weather-resistant for outdoor use and rated for 300 Volts. SJTW thermoplastic cables are know for their extreme durability and reliability. These cords are designed to resist outdoor conditions, weather, and abrasion. Their reliability makes SJTW cords a crucial component for ensuring safe and efficient electrical connections in various environments.
If a rating doesn’t have a “T”, that means the outer jacket is made from rubber. Ratings without a “J” have a 600V hard service rating.
Variations – STJ, SJTOW, SJOW, and SJOOW Cables
SJOW printed on high output LED high bay power cord.
SJTW cables have several variations, with the main difference being how they are made. An SJT cable is a hard service cable with a thermoplastic jacket rated for 300 Volts, but lacks the weather-resistance rating of SJTW cords. SJTOW cables have all the same features as SJTW cords. The only change is the inclusion of the “O”, which means it has oil resistant insulation. Please note, however, that only the jacket is oil resistant.
A SJOW cord, as shown to the right, is a stranded hard service cord rated for 300V that is outdoor approved. Since the rating does not include the “T”, it has a rubber jacket. It also has an “O”, making it oil resistant. Another variation is the SJOOW. This is a stranded, 300 Volt hard service cord with a rubber jacket. Since it has a “OO”, both the jacket and lining are gasoline resistant.
Applications for SJTW Cables
SJTW cables are utilized for a wide variety of applications. With their ability to support significant power levels, these cables are the go-to choice for heavy-duty industrial applications. Compressors, drill presses, power washers, and other similar equipment all have power cables made of SJTW cable. Even smaller companies like professional digital studios use them.
Drill press using thermoplastic cable.
The lighting industry also uses SJTW cord. You can find it used to power nearly any sort of light, from the fixtures used for professional photoshoots to the lights you have in your warehouse or business. You can even find it used for the majority of the patio light stringers sold on our website.
Electrical appliances also rely on SJTW cable. From the heavy-duty machinery mentioned above to small appliances like coffee makers, SJTW powers it all. Keep in mind that different types of electrical equipment may require different lengths and sizes of SJTW cables to ensure optimal performance.
Choosing the Right SJTW Cables
When selecting SJTW cables, you need to consider the specific needs of your application. In many cases, especially in the cases of lighting a electrical equipment, SJTW is the preferred choice due to it’s flexibility. Just keep in mind that the number of conductors in the cable affects it’s strength. This means that larger cables are best suited for heavy-duty applications, while smaller SJTW cables can be used for less demanding applications.
Have questions about your power cord or cable? Speak with one of our US-based lighting experts at 1-800-624-4488 today. They can help you determine what your cord is rated for, and even help you find the right extension cords for all of your applications.
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