Dell S4048T-ON Guide De Mise En Route page 22

WARNING: To prevent electrical shock, ensure that the system is
grounded properly. If you ground your equipment incorrectly,
excessive emissions may result. To ensure that the power cables meet
your local electrical requirements, use a qualified electrician.
CAUTION: DO NOT mix airflow directions. Both power supplies must
use the same airflow direction. The airflow direction of the power
supply integrated fans must also match the airflow direction of the fan
modules.
NOTE: Ensure that the PSU is correctly installed. When you correctly
install the PSU, the power connector is on the right side of the PSU.
NOTE: Dell Networking recommends supplying power from the switch
PSU to the external power source only after the chassis is mounted in a
rack or cabinet.
CAUTION: The S4048T-ON contains two power cords. Disconnect
both power cords before servicing.
Connecting a DC Power Supply to the Power Source
To connect a DC PSU to the site's DC power source, follow these steps.
Each DC power supply (PSU) comes with a connector cable. One cable is
provided for each DC PSU.
Figure 12. DC Power Supply and Connector Cable
1. DC PSU power socket.
2. Cable connector thumb screw.
3. Cable connector wires (black, green, blue).
4. Wiring block and screws.
5. DC power source wires (black, green, blue).
1. Strip 1/2 inches of insulation from each of the site's DC power source
wires (black, green, blue). See item 5 in the figure.
2. Insert each of the site's DC power source's bare wire lengths into the
wiring block, matching wire colors. See items 3 and 4 in the figure.
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