NEC NF2300-SR412E User Manual page 72

(2) Connection of power cords
Insert the receptacle of the power cord into the power plug on the power supply.
Make sure that the removal protection mechanism for the power supply of the array
controller is placed outward as shown in the figure below. Then inset the power cord
to the plug.
When connecting the power supply of the disk enclosure, push down the power cord
stopper (for the power cord) toward the left, insert the power cord, and then secure
the power cord by firmly fitting the power cord stopper into the receptacle of the
power cord.
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