1. Well insulated and as long as may be necessary to permit the shot firer to get in a safe place around a corner;

2. Short-circuited at the battery end until ready to attach to the blasting unit;

3. Staggered as to length or the ends kept well separated when attached to the detonator leg wires; and

4. Kept clear of power wires and all other possible sources of active or stray electric currents.