Lenovo 5594-8KX User, Installation And Maintenance Manual page 17

Safety statements
Statement 27
CAUTION: Hazardous moving parts are nearby.
Rack Safety Information, Statement 2
Always lower the levelling pads on the rack cabinet.
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Always install stabilizer brackets on the rack cabinet.
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Always install servers and optional devices starting from the bottom of the rack
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cabinet.
Always install the heaviest devices in the bottom of the rack cabinet.
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6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG ix