Grounding Requirements; Connecting Dc Power Cable And Dc Power Supply - NEC Express5800/R120h-2M User Manual

Chapter 2 Preparations

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

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.
Important Turn off the power supply before performing the power supply installation
procedure or maintenance.
Note The grounded conductor of the DC supply circuit and the ground conductor are
connected each other in the server unit. For details, refer to the document
included in the power supply.
Note If the grounded conductor of the DC supply circuit and the ground conductor are
DC-connected on the server device, the following conditions must be met.
Express5800/R120h-2M User's Guide
2. Installation and Connection
165