The Seven Steps
Motion Isolators


To secure computer equipment on an access floor.


Seek engineering assistance for the design of the tether spring. Typical equipment to tether:

  • Disk drive controllers
  • Disk drives
  • High speed printers
  • Magnetic tape drives
  • Printer controllers
  • Tape drive controllers


Provide horizontal motion isolators for computer equipment with the following characteristics:


    Height less than 1-1/2 times the base width.


    Moderate spacing (1-1/2 to 3′) between equipment.


    Flexible equipment cabinet that cannot be adequately strengthened or stiffened.

Internal Components

    Internal components with HIGH vulnerability to vibrating motion.

Supplies Required

  • Seismic level pads (with nylon boot)
  • Floor penetration guard
  • Steel cable tether (with springs)
  • Eyebolt with expansion insert—1/2″diameter
  • Machine bolt—1/2″ diameter


Leveling Pad
Source: Noson, Perbix, SSD

Isolated Equipment
Source: Noson, Perbix, SSD

  1. Provide a leveling pad below each corner of the equipment.
  2. Provide a penetration guard around access floor opening.
  3. Provide more slack in signal cables than in tether.
  4. Provide a steel tether between equipment and floor structure.