IBM DS3500 Installation, User's, And Maintenance Manual page 17

CAUTION:
Do not place any object on top of rack-mounted devices.
Statement 29
CAUTION:
This equipment is designed to permit the connection of the earthed conductor of the dc supply circuit
to the earthing conductor at the equipment. If this connection is made, all of the following conditions
must be met:
v This equipment shall be connected directly to the dc supply system earthing electrode conductor or
to a bonding jumper from an earthing terminal bar or bus to which the dc supply system earthing
electrode conductor is connected.
v This equipment shall be located in the same immediate area (such as, adjacent cabinets) as any
other equipment that has a connection between the earthed conductor of the same dc supply circuit
and the earthing conductor, and also the point of earthing of the dc system. The dc system shall not
be earthed elsewhere.
v The dc supply source shall be located within the same premises as this equipment.
v Switching or disconnecting devices shall not be in the earthed circuit conductor between the dc
source and the point of connection of the earthing electrode conductor.
Statement 34
xvii
Safety