AC Power and HVAC Service Requirements
2-2 Stratus ftServer 29x0, 49x0, and 69x0 Systems: Site Planning and Installation Guide (R786)
The wattage required from the A-side power source will always be equal to or greater
than the wattage required from the B-side power source.
AC Power and HVAC Service Requirements
From Table 7-1, obtain the nominal input line voltage (volts AC) and frequency (Hz)
required for optional storage systems. In general, provide 100–127 VAC or 200–240
VAC at 50 or 60 Hz for optional components. PDUs require 200–240 VAC at 50 or 60
Hz. Operating the system at the higher end of the voltage range, when possible, results
in higher power system efficiency and consequently less generated heat and lower
utility costs.
For detailed information about the plug types and lengths of the power cords provided
with the system, see “Power Cord Summary” on page 2-7.
The power service must be properly wired and grounded according to local standards
and regulations. See Appendix B, “Electrical Circuit and Wiring Information”, for more
information.
A branch circuit breaker with ground fault protection must
allow a minimum of 3.5 milliamperes (mA) leakage current
for each power cord.
Use the following worksheets to determine AC power requirements for the site.
In Table 2-1, determine the power requirements at the A-side power source.
In Table 2-2, determine the power requirements at the B-side power source.
In Table 2-3, determine the power requirements for components outside of the
cabinet (for example, monitor, tape drives, ASN modem, and so on). These
components can share a power source with the A-side or B-side components.
In Table 2-4, determine the related HVAC requirements.
To determine AC power requirements
Provide information in Tables 2-1, 2-2, and 2-3 as follows:
1. In the Quantity column, write the number of each type of component.
2. Multiply the entry in the Quantity column by the number in the Watts column, and
enter the result in the Watts Subtotal column.
3. Add the values in the Watts Subtotal column, and enter the sum on the bottom
line. This value indicates the maximum power requirement for each power source.
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