IBM eServer 380 xSeries User Reference Manual page 10

Statement 14
CAUTION:
Hazardous voltage, current, and energy levels might be present. Only a
qualified service technician is authorized to remove the covers where the
following label is attached.
Statement 15
CAUTION:
Make sure that the rack is secured properly to avoid tipping when the server
unit is extended.
Statement 16
CAUTION:
Some accessory or option board outputs exceed Class 2 or limited power
source limits and must be installed with appropriate interconnecting cabling in
accordance with the national electric code.
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xSeries 380: User's Reference