When you need a flexible extension cord, a rubber one can be a great solution. These cables are made with TPE rubber for exceptional flexibility and strength. They are flame retardant and are resistant to oil, moisture and ozone. They also feature a powerful Primelight power indicator light, which lets you know when power is running through the cable. They also have oil-resistant inner conductors and durable jacketing.

Depending on the purpose of the cord, some cords may have special markings or features. Some may be temperature-rated up to 75 degrees Celsius, water-resistant, or have a usage designation like "FOR MOBILE HOME USE." Other types of cords may have designations like "Extra Hard Service," "SE", or "SO". These cords are designed to be rugged and withstand abrasion and crushing.

Extension cords are available in a wide range of colors and gauges. The higher the gauge, the heavier the cord, which will reduce the risk of overheating. Light gauge extension cords tend to overheat when they are connected to electrical equipment. This is potentially dangerous, especially if they are exposed to children or pets.

Generally, extension cords are sold in prefabricated lengths of between one and 150 feet. However, if you need a longer cord, you can order one that is 30 cm to 45 feet long. However, be aware that each foot adds to the electrical resistance and decreases the power cord capacity. This is why longer cords require larger diameter wire to minimize voltage loss.