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.
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 30:
CAUTION:
To reduce the risk of electric shock or energy hazards:
v This equipment must be installed by trained service personnel in a
restricted-access location, as defined by the NEC and IEC 60950-1, First
Edition, The Standard for Safety of Information Technology Equipment.
v Connect the equipment to a reliably grounded safety extra low voltage
(SELV) source. An SELV source is a secondary circuit that is designed so
that normal and single fault conditions do not cause the voltages to exceed
a safe level (60 V direct current).
v The branch circuit overcurrent protection must be rated 20 A.
v Use 12 American Wire Gauge (AWG) or 2.5 mm2 copper conductor only, not
exceeding 4.5 meters in length.
v Incorporate a readily available approved and rated disconnect device in the
field wiring.
CAUTION:
Disconnect the power cord before removing the dc power supply and fan unit.
Complete the following steps to remove a dc power supply and fan unit:
1. Squeeze the latch and pull the lever open 90° (so that the lever is horizontal) to
release the dc power supply and fan unit from the latch. The latch is a coral
colored tab on the lever.
2. Slowly pull the lever away from the chassis to remove the dc power supply and
fan unit, as shown in Figure 23 on page 45.
44 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide
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