This high temp wire cover is 36 inches long by 3/8 inch diameter (inside diameter). I have attached an image below so you have a better idea of what the end looks like. This will definitely work if it is the right size for your application.
This will fit the wire size you need but what you are experiencing should not be happening to your power cord. You may want to contact a service tech or the manufacturer so they can walk you through some troubleshooting.
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