NEC Express5800 Series User Manual page 150

Chapter 2 Preparations
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.
3. Group together wires of the same color and attach them to the same power supply. The power cord
consists of three wires (black, red, and green).
For details, refer to the document included in the power supply.
150
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.
Important
The minimum nominal diameter for the sled of pillar or stud type terminal
should be 3.5 mm (0.138 in.). Also, the diameter of the screw type terminal
should be 4.0 mm (0.157 in.).
Express5800/R120h-2E User's Guide
2. Installation and Connection