Rack safety

The following general safety information must be used for all rack-mounted devices.


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General caution symbol
Observe the following precautions when working on or around your IT rack system.
  • Heavy equipment - personal injury or equipment damage might result if mishandled.
  • Always lower the leveling pads on the rack cabinet.
  • Always install stabilizer brackets on the rack cabinet.
  • To avoid hazardous conditions due to uneven mechanical loading, always install the heaviest devices in the bottom of the rack cabinet. Always install servers and optional devices starting from the bottom of the rack cabinet.
  • Rack-mounted devices are not to be used as shelves or work spaces. Do not place objects on top of rack-mounted devices. In addition, do not lean on rack mounted devices and do not use them to stabilize your body position (for example, when working from a ladder).
    No objects on devices
  • Each rack cabinet might have more than one power cord.
    • For AC powered racks, be sure to disconnect all power cords in the rack cabinet when directed to disconnect power during servicing.
    • For racks with a DC power distribution panel (PDP), turn off the circuit breaker that controls the power to the system unit(s), or disconnect the customer’s DC power source, when directed to disconnect power during servicing.
  • Connect all devices installed in a rack cabinet to power devices installed in the same rack cabinet. Do not plug a power cord from a device installed in one rack cabinet into a power device installed in a different rack cabinet.
  • An electrical outlet that is not correctly wired could place hazardous voltage on the metal parts of the system or the devices that attach to the system. It is the responsibility of the customer to ensure that the outlet is correctly wired and grounded to prevent an electrical shock. (R001 part 1 of 2)


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  • Do not install a unit in a rack where the internal rack ambient temperatures might exceed the manufacturer's recommended ambient temperature for all your rack-mounted devices.
  • Do not install a unit in a rack where the air flow is compromised. Ensure that air flow is not blocked or reduced on any side, front, or back of a unit that is used for air flow through the unit.
  • Consideration must be given to the connection of the equipment to the supply circuit so that overloading of the circuits does not compromise the supply wiring or overcurrent protection. To provide the correct power connection to a rack, refer to the rating labels on the equipment in the rack to determine the total power requirement of the supply circuit.
  • (For sliding drawers) Do not pull out or install any drawer or feature if the rack stabilizer brackets are not attached to the rack. Do not pull out more than one drawer at a time. The rack might become unstable if you pull out more than one drawer at a time.
    Sliding drawers danger
  • (For fixed drawers) This drawer is a fixed drawer and must not be moved for servicing unless specified by the manufacturer. Attempting to move the drawer partially or out of the rack might cause the rack to become unstable or cause the drawer to fall out of the rack. (R001 part 2 of 2)


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Removing components from the upper positions in the rack cabinet improves rack stability during relocation. Follow these general guidelines whenever you relocate a populated rack cabinet within a room or building:
  • Reduce the weight of the rack cabinet by removing equipment, starting at the top of the rack cabinet. When possible, restore the rack cabinet to the configuration of the rack cabinet as you received it. If this configuration is not known, you must do the following:
    • Remove all devices in the 32U position (compliance ID RACK-001) or 22U (compliance ID RR001) and above.
    • Ensure that the heaviest devices are installed in the bottom of the rack cabinet.
    • Ensure that there are little-to-no empty U-levels between devices installed in the rack-cabinet below the 32U (compliance ID RACK-001) or 22U (compliance ID RR001) level, unless the received configuration specifically allowed it.
  • If the rack cabinet you are relocating is part of a suite of rack cabinets, detach the rack cabinet from the suite.
  • If the rack cabinet you are relocating was supplied with removable outriggers, they must be reinstalled before the cabinet is relocated.
  • Inspect the route that you plan to take to eliminate potential hazards.
  • Verify that the route that you choose can support the weight of the loaded rack cabinet. Refer to the documentation that comes with your rack cabinet for the weight of a loaded rack cabinet.
  • Verify that all door openings are at least 760 x 2032 mm (30 x 80 in.).
  • Ensure that all devices, shelves, drawers, doors, and cables are secure.
  • Ensure that the four leveling pads are raised to their highest position.
  • Ensure that no stabilizer bracket is installed on the rack cabinet during movement.
  • Do not use a ramp that is inclined at more than 10 degrees.
  • When the rack cabinet is in the new location, complete these steps.
    • Lower the four leveling pads.
    • Install stabilizer brackets on the rack cabinet or in an earthquake environment bolt the rack to the floor.
    • If you removed any devices from the rack cabinet, repopulate the rack cabinet from the lowest position to the highest position.
  • If a long-distance relocation is required, restore the rack cabinet to the configuration of the rack cabinet as you received it. Pack the rack cabinet in the original packaging material, or equivalent. Also, lower the leveling pads to raise the casters off the pallet and bolt the rack cabinet to the pallet. (R002)
    Racks with a total weight of > 227 kg (500 lb.), Use Only Professional Movers! (R003)


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  • Rack is not intended to serve as an enclosure and does not provide any degrees of protection required of enclosures.
  • It is intended that equipment installed within this rack will have its own enclosure. (R005)
  • Tighten the stabilizer brackets until they are flush against the rack. (R006)
  • Use safe practices when lifting. (R007)
  • Do not place any object on top of a rack-mounted device unless that rack-mounted device is intended for use as a shelf. (R008)
  • If the rack is designed to be coupled to another rack only the same model rack should be coupled together with another same model rack. (R009)


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Protective Earth

Main Protective Earth (Ground): This symbol is marked on the frame of the rack. The PROTECTIVE EARTHING CONDUCTORS must be terminated at that point. A recognized or certified closed loop connector (ring terminal) must be used and secured to the frame with a lock washer using a boltor stud. The connector must be properly sized to be suitable for the bolt or stud, the locking washer, the rating for the conducting wire used, and the considered rating of the breaker. The intent is to ensure the frame is electrically bonded to the PROTECTIVE EARTHING CONDUCTORS. The hole that the bolt or stud goes into where the terminal connector and the lock washer contact must be free of any non-conductive material to allow for metal to metal contact. All PROTECTIVE BONDING CONDUCTORS must terminate at this main protective earthing terminal or at points marked with Main Protective Earth icon. (R010)

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Always ensure that a load of 95 kg (210 lb) is inside the bottom of the rack (compliance ID RR001), especially before relocating or servicing units with their Center of Gravity (CoG) higher than 22U. (R011)