Cabling The Ds3500 And Exp3500 Dc Power Supplies - IBM DS3500 Installation, User's, And Maintenance Manual

Cabling the DS3500 and EXP3500 dc power supplies

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
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. Make sure that the power on-off switch on both of the dc power supply and fan units in the chassis
are in the off position.
2. Using the supplied strap, tie the dc power supply cable to the rail to provide strain relief for the
power cable.
Note: The supplied dc power cable uses 10 AWG copper conductors.
Chapter 3. Cabling the storage subsystem and storage enclosure
3-47