Dc Supply And Ground Conductor Requirements; Overcurrent Protection Requirements - Fujitsu Sparc Enterprise T5120 Installation Manual

Power supply connections through the input connector: 8 AWG (between the
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server and the source). There are three conductors:
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System ground conductor: 8 AWG (to be connected to the chassis)
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Cable insulation rating: Minimum of 75˚C (167˚F), low smoke fume (LSF), flame
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retardant
Provide the mating connector, Wago Part Number 51204745, for proper connection
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to the DC connectors supplied with the server.
This connector requires a 4mm flat-blade screwdriver to insert wires into the
connector body.
Branch circuit cable insulation color: Per applicable National Electrical Codes
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Grounding cable insulation color: Green/Yellow
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DC power source must meet TNV-2 requirements as defined by UL 60950-1 and
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IEC 60950-1
Note – Depending on the DC power source, the -48V or -60V (negative terminal)
might be marked with a minus (-) symbol, and the -48V or -60V Return (positive
terminal) might be marked with a positive (+) symbol.
When attaching DC cables, keep the following caution in mind:
Caution – You must restrict the connection of the server to the DC power source to
minimize the possibility that transient energy will appear on the main input to the
equipment. The DC battery power source must be in the same premises as the server.
The server cannot be in one building with the power source in another building.

Overcurrent Protection Requirements

Overcurrent protection devices must be provided as part of each equipment rack.
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Circuit breakers must be located between the DC power source and the server. Use
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one 40 A fast-trip double-pole DC-rated circuit breaker for each power supply
unit.
Note – Overcurrent protection devices must meet applicable national and local
electrical safety codes and be approved for the intended application.
100 SPARC Enterprise T5120 and T5220 Servers Installation Guide • July 2009
-48V or -60V (negative terminal)
Chassis ground connection
-48V or -60V Return (positive terminal)