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Because of the high ground-leakage currents associated with multiple servers connected to the same power source,
Hewlett Packard Enterprise recommends the use of a PDU that is either permanently wired to the building's branch circuit
or includes a nondetachable cord that is wired to an industrial-style plug. NEMA locking-style plugs or those complying
with IEC 60309 are considered suitable for this purpose. Using common power outlet strips for the server is not
recommended.
Connecting a DC power cable to a DC power source
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, Second
Edition, 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 branch circuit overcurrent protection must be rated 27 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 the 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.
•
This equipment should 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 should 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.
To connect a DC power cable to a DC power source:
1. Cut the DC power cord ends no shorter than 150 cm (59.06 in).
2. If the power source requires ring tongues, use a crimping tool to install the ring tongues on the power cord wires.
IMPORTANT: The ring terminals must be UL approved and accommodate 12 gauge wires.
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Setup
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