Cabling the DS3500 and EXP3500 dc power supplies
Statement 29
CAUTION:
This equipment is designed to enable 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 must 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 must 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 must be located within the same premises as this
equipment.
v Switching or disconnecting devices must not be in the earthed circuit
conductor between the dc source and the point of connection of the earthing
electrode conductor.
Statement 34
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 Incorporate a readily available approved and rated disconnect device in the
field wiring.
v See the specifications in the product documentation for the required
circuit-breaker rating for branch circuit overcurrent protection.
v Use copper wire conductors only. See the specifications in the product
documentation for the required wire size.
v See the specifications in the product documentation for the required torque
values for the wiring-terminal nuts.
To connect the DS3500 and EXP3500 dc power-supply cables, complete the
following steps:
1. Ensure that the power on-off switch on both of the dc power supply and fan
units in the chassis are in the off position.
78 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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