IBM x3250 - System M3 - 4251 Installation And User Manual page 15

Statement 6:
CAUTION:
Do not place any objects on top of a rack-mounted device unless that
rack-mounted device is intended for use as a shelf.
Statement 8:
CAUTION:
Never remove the cover on a power supply or any part that has the following
label attached.
Hazardous voltage, current, and energy levels are present inside any
component that has this label attached. There are no serviceable parts inside
these components. If you suspect a problem with one of these parts, contact
a service technician.
Statement 12:
CAUTION:
The following label indicates a hot surface nearby.
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Safety