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Connecting a DC power cable to a DC power source
About this task
WARNING: To reduce the risk of electric shock or energy hazards:
•
This equipment must be installed by trained service personnel, as defined by the NEC and IEC 60950-1/IEC
62368-1, the standard for Safety of Information Technology Equipment.
•
Connect the equipment to a reliably grounded secondary circuit source. A secondary circuit has no direct
connection to a primary circuit and derives its power from a transformer, converter, or equivalent isolation
device.
•
The overcurrent protection for the DC source must not exceed 45 A.
WARNING: When installing a DC power supply, the ground wire must be connected before the positive or negative
leads.
WARNING: Remove power from the power supply before performing any installation steps or maintenance on the
power supply.
CAUTION: The server equipment connects the earthed conductor of the DC supply circuit to the earthing
conductor at the equipment. For more information, see the documentation that ships with the power supply.
CAUTION: If a DC connection exists between the earthed conductor of the DC supply circuit and the earthing
conductor at the server equipment, the following conditions must be met:
•
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.
•
Locate the equipment 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 must be earthed elsewhere.
•
The DC supply source is to be located within the same premises as the equipment.
•
Switching or disconnecting devices should not be in the earthed circuit conductor between the DC source and
the point of connection of the earthing electrode conductor.
Procedure
1. Cut the DC power cord ends no shorter than 150 cm (59.06 in).
IMPORTANT: The ring terminals must be UL approved and accommodate 12 gauge wires.
IMPORTANT: The minimum nominal thread diameter of a pillar or stud type terminal must be 3.5 mm
(0.138 in). The diameter of a screw type terminal must be 5.0 mm (0.197 in).
2. If the power source requires ring tongues, use a crimping tool to install the ring tongues on the power cord wires.
3. Stack each same-colored pair of wires and then attach them to the same power source. The power cord consists of
three wires (black, red, and green).
For more information, see the documentation that ships with the power supply.
Hardware options installation
101
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