NEC 140He - Manual (Page 23)

1-7
During Operation
CAUTION
Avoid contact with the server during thunderstorms.
Disconnect all power plugs from the outlets when a thunderstorm is approaching. If it starts
thundering before you disconnect the all power plugs, do not touch any part of the server
including the cables. Failure to follow this warning may cause a fire or an electric shock.
Keep animals away from the server.
Failure to follow this warning may cause a fire or an electric shock.
Do not place any object on top of the server.
An object placed on top of the server may fall down, resulting in damage to your property
around the server.
Do not use a cellular phone or pager around the server.
Turn off the cellular phone or pager. Radio interference may cause malfunctions of the server.
Do not remove the cooling fans.
Only an authorized service technician can remove the cooling fans from the server.