when to use safety cable
Safety cable is an alternative to safety wire. Safety cable is defined as a group of strands right-hand helically twisted without a core. This eliminates the need for twisting during installation, as is required with safety wire.
Safety wiring of two pairs of drilled bolt-heads wired one-to-the-other. Safety wire or locking-wire is a type of positive locking device that prevents fasteners from loosening or falling out due to vibration and other forces. The presence of safety wiring may also serve to indicate that the fasteners have been properly tightened.