Connecting Dc Power Cable And Dc Power Supply - NEC Express5800 Series User Manual

Chapter 2 Preparations
2.1.6

Connecting DC power cable and DC power supply

For connecting the DC power cable to DC power supply, follow the procedure below.
1. Cut the DC power cord at least 150 cm (59.06 in.) in length.
2. If ring tongs are required for the power supply, use a crimping tool to attach the ring tongue to the power
cord wire.
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.
Important
The ring terminal must conform to UL certified 12 gauge.
Express5800/R120h-1E User's Guide
2. Installation and Connection
129