Rackable Systems OmniStor 4900F Series, User Manual, Page: 20 / 196

Chapter 1 - Getting Started
Optional DC Hot Swappable Power Supplies
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The power feed must be electrically isolated from any AC power source, provide a reliable
connection to earth (battery room positive bus is connected to the grounding electrode),
and capable of providing up to 600 watts of continuous power per feed pair.
Overcurrent Protection Requirements
Overcurrent protection devices must be provided as part of each equipment rack. Circuit
breakers must be located between the DC power feed source and the power supplies (two
20 amp double-pole fast rip DC-rated circuit breakers for each power supply).
NOTE:
Overcurrent protection devices must meet applicable national and local electrical
safety codes and be approved for the intended application.
Power supply overload protection will shut down the power supply when the output power
rating exceeds 110% to 130% of maximum rated output current.
DC Supply and Ground
You DC supply and ground conductor must meet the following requirements:
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Suitable conductor material: copper only.
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Power supply connections through the input connectors; 12AWG:
-48V
-48V Return
Ground to the power supply
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System ground conductor: 8 AWG.
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Cable insulation rating: minimum of 75 C, low smoke fume (LSF), flame retardant.
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Branch circuit cable insulation color: per applicable national electrical codes.
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Cable type: UL style 1028, UL 1581(VW-1), IEEE 383 compliant, or IEEE
1202-1991 compliant.
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Grounding insulation color: green/yellow.