IBM DS4700 manual Installing the storage subsystem

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:

vThis 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.

vThis 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.

vThe dc supply source shall be located within the same premises as this equipment.

vSwitching 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:

vThis 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.

vConnect 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).

vThe branch circuit overcurrent protection must be rated 20 A.

vUse 12 American Wire Gauge (AWG) or 2.5 mm2 copper conductor only, not exceeding 4.5 meters in length.

vIncorporate a readily available approved and rated disconnect device in the field wiring.

CAUTION:

Disconnect the power cord before replacing the power supply and fan unit.

CAUTION:

This unit has more than one power source. To remove all power from the unit, all dc MAINS must be disconnected.

Chapter 2. Installing the storage subsystem 51