Electrolux sheath cord is the cord inside of the plastic sheath. This cord typically burns out it you remove the hose form the power head while it is still running or in some cases its just a wear and tear item. If the cord is burned out you will also want to inspect the female connections on the hose to make sure the electrical contact on the hose are not burned out. Also if your power nozzle cord falls out while vacuuming then replacing the sheath cord will solve this problem.
Click the video below on how to change the sheath cord.
