Stratus ftserver 3300, Site Planning Manual

Page: 119 / 138

Electrical Circuit and Wiring Information C-1
Appendix C
Electrical Circuit and Wiring Information
C-
For electrical circuit and wiring information you need to provide to the contractor and/or
facilities personnel responsible for wiring the power at the system installation site, see:
•
“Fault Protection Requirements” on page C-1
•
“Grounding Considerations” on page C-1
•
“Circuit Wiring Diagrams” on page C-3
•
“Electrical Power Connectors” on page C-9
Fault Protection Requirements
Each enclosure in the ftServer system contains fault/overload current protection.
However, the system relies on the power distribution system at your site for protection
against potential faults in the power cords and the wiring in the system base.
•
If you are using a pair of PDUs in the cabinet, use 30A or less circuit breakers in
each power distribution branch feeding the PDUs.
•
To connect a single system to power, use 20A or less circuit breakers in each power
distribution branch feeding the systems.
Grounding Considerations
The system obtains an earth reference ground through the power cords attached to the
system. Similarly, each peripheral device connected to the system obtains ground
through its power cord. For each peripheral device, you must ensure that a
high-integrity safety-ground conductor is installed as part of the wiring system (in
accordance with U.S. national electric code NFPA 70 or the equivalent). The
international safety standard (EN60950) for electronic data processing (EDP)
equipment also requires a ground conductor, but calls it a protective earth (PE) ground.
Depending upon local conditions, ground potentials may differ between the system
base and any peripheral devices connected to the system base. All grounds in the
system must return to the same reference point in the power distribution system, as
close as possible to zero (0) volt potential relative to earth reference ground. Earth
reference ground is typically a metal stake in the ground to which the ground
conductors from one or more buildings are attached.