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Chapter 2 Preparations
If more than one server are installed, additional distribution equipment may require to be used for securely
powering all the devices. Follow the guidelines below.
Make sure that each of the power supply loads is uniform among the available AC power branch circuits.
Make sure that the AC current load through the entire system does not exceed 80% of AC current rating of
the branch circuits.
Do not use the extension cord with the outlet for general use for this unit.
Prepare a dedicated electrical circuit on the server.
Grounding Requirements
For proper operation and usage, the server must be properly grounded. In the United States, the equipment must
be installed according to the section 250 of NFPA 70, 1999 Edition (National Electric Code) as well as regional
building standards. In Canada, the equipment must be installed according to Canadian Standards Association,
CSA C 22.1, Canadian Electrical Code. In all other countries, the equipment must be installed according to the
Electrical Wiring Rules of your region such as the Codes 364-1 to 7 of International Electrotechnical Commission
(IEC). In addition, all types of the distribution equipment used for installation such as branch wires and outlets
must be the grounded equipment that is specified or approved.
For preventing high voltage leakage current generated from multiple servers that are connected to the same
power supply, we recommend connecting fixedly to the branch circuit of the building, or using a PDU equipped
with a non-removable cord connected to the industrial plug. NEMA locking plugs or IEC 60309 compliant plugs
are suitable for this purpose. For the server, an extension cord with the outlet for general use is not recommended
to be used.
Connecting DC power cable and DC power supply
Note
Use a UPS (Uninterruptible power supply) to protect the server from unstable
power situation or temporary power outages. The UPS protects the hardware
against damages caused by power surges and voltage spikes, and allows the
system to continue operation even during a power outage.
Important
To prevent injuries due to electric shock or high voltage, observe the
following precautions.
Installation of this equipment should be performed by a trained specialist
that is defined in NEC and IEC 60950-1 Second edition "The standard for
Safety of Information Technology Equipment."
Connect the equipment to the secondary circuit power supply that is
properly grounded. The secondary circuit does not have direct
connection with the primary circuit, and gains power from a transformer,
converter, or equivalent isolation device.
The overcurrent protection of the branch circuit should be 27 A.
Important
When installing the DC power supply unit, the ground wire must be
connected before connecting the positive or negative electrode lead.
Express5800/R120h-1M User's Guide
2. Installation and Connection
165
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