Shorted and Sheathed refers to the leg wires of electric detonators as supplied from the factory.

Shorting prevent stray currents from creating a voltage across the bridge wire that could lead to accidental initiaiton. Shorting is achieved by twisting the leg wires together.

Sheathing prevent the exposed ends of the leg wires from accidental contact with electrical sources. Sheathing is achieved by placing a non-conductive plastic tube over the exposed ends of the leg wires.

In Australia all electric detonators must be supplied shorted and sheathed.

Shorted and sheated electric detonators.