Allied Telesis AT-x510DP-52GTX - Manual (Page 68)

Chapter 4: Installing the Switch and its Power Supplies
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3. Connect the other end of the power cord to an appropriate AC power
outlet. For power specifications for the switch, refer to “Power
Specifications” on page 124.
Warning
This unit might have more than one power supply. To reduce the risk
of electric shock, disconnect all power cords before servicing the
unit.
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4. Repeat the above procedure for the second PSU, if necessary.
5. Start a local management session on the unit by performing the
procedure in “Starting a Local Management Session” on page 73.