The extension cord with the letter E has a jacket made from TPE, thermoplastic elastomer. This is the most durable type of material often used in heavy-duty cords.
For example, high-amperage appliance extension cords are designed to carry 20 amps or more. All extension cords have an AWG (American wire gauge) rating. This rating is a standardized wire gauge system for measuring electrical wire.
Heavy-duty extension cords are designed for appliances drawing 10 to 15 amps of power. They are the best choice for power tools and appliances such as heaters that draw up to 15 amps of power. Chose the following gauge based on cord length: Up to 25 feet: 14 AWG wire. Up to 50 feet: 12 AWG
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