Connecting Power And Ground In A Nebs Environment; Dc Power Source, Power Connection, And Grounding - Supermicro A+ Server AS-1115S-FWTRT User Manual

2.6 Connecting Power and Ground in a NEBS environment

DC Power Source, Power Connection, and Grounding

Note: This product should be installed only in a Restricted Access Location, that is, a
dedicated equipment room, service closet, etc. A Restricted Access Location is an area
intended for qualified and trained personnel only and is access controlled.
A reliable ground to the DC power supply must be maintained at all times. The server
must be grounded with the chassis ground studs, which ensures the equipment is
not energized through cable connections when both power supplies are removed.
Simultaneous connections to both the chassis ground stud and the DC power supply
ground is permissible.
The DC power source shall be in the same building as the server to minimize the pos-
sibility of transient energy to the main inputs of the server.
The DC power supply has three connections/conductors:
•
-48 Vdc, negative terminal (Battery).
•
Safety Ground, indicated by "Earth GND Symbol". (Optional because Chassis GND stud
is connected)
•
+Return, positive terminal (Battery Return, BR).
Supermicro provides a cable for connection to the DC power supply. You should use the
provided cable or an equivalent cable with the following specifications:
•
Positronic CBD connector.
•
Conductor Wire size: 8WG.
•
Safety Ground insulation color: Green/Yellow.
•
Use copper conductors only.
Note: If using the Supermicro provided DC power cables, the connector and contacts do
not need to be treated with anti-oxidants prior to connection to the power supply in the
server. Otherwise, the cable wires should be prepared to a bright finish, and coated with an
appropriate anti-oxidant prior to crimping or connections to the battery, battery return, and
Earth Ground per GR1089 R9-19 [84].
Figure 2-5. DC Input Power Cable Connector
Chapter 2: Server Installation
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