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Electrical grounding requirements
The server must be grounded properly for proper operation and safety. In the United States, you must install
the equipment in accordance with NFPA 70, National Electric Code Article 250, as well as any local and
regional building codes. In Canada, you must install the equipment in accordance with Canadian Standards
Association, CSA C22.1, Canadian Electrical Code. In all other countries, you must install the equipment in
accordance with any regional or national electrical wiring codes, such as the International Electrotechnical
Commission (IEC) Code 364, parts 1 through 7. Furthermore, you must be sure that all power distribution
devices used in the installation, such as branch wiring and receptacles, are listed or certified grounding-type
devices.
Because of the high ground-leakage currents associated with multiple servers connected to the same power
source, use 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.
Electrical grounding requirements
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