Grounding Requirements; Connecting Dc Power Cable And Dc Power Supply - NEC EXP805 User Manual

Chapter 2 Preparations

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, it is recommend to connect fixedly to the branch circuit of the building, or to use 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

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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.
 This device must be connected directly to the grounded electrode conductor of
the DC supply system, or to the bonding jumper from the bar or the bus of the
ground terminal of the connection destination.
 This device must be installed in other devices which the grounded conductors
of the same DC supply circuit and the ground conductors are connected to,
and in the same adjacent area as the DC system ground point (such as an
adjacent cabinet). The DC system must be grounded elsewhere.
 The DC source must be installed in the same building where the equipment
installed.
 The switches or power-off devices should not be located on the grounded
circuit conductor between the DC source and the connection point of the
ground electrode conductor.
Express5800/R120h-2M (2nd-Gen) User's Guide
2. Installation and Connection