Electricity safety
Clear the work area of possible hazards, such as ungrounded power extension cables, missing safety grounds, and wet floors.
Locate the emergency power-off switch in the room before installation. Shut the power off at once in case accident occurs.
Unplug all the external cables (including power cords) before moving the chassis.
Do not work alone when the switch has power.
Always check that the power has been disconnected.