Table 4. Electrical characteristics for the 8408-44E and 8408-E8E
1, 7
(continued)
Electrical characteristics Properties
Thermal output (maximum)
3,6
11940 BTU/hr (8408-E8E)
13140 BTU/hr (8408-44E)
Maximum power consumption
3,6
3500 W (8408-E8E)
3850 W (8408-44E)
Maximum kVA
4,6
3.57 (8408-E8E)
3.9 (8408-44E)
Phase Single
Notes:
1. Normal operation with four power supplies. Each power supply has an IEC 320 C20 inlet. If your system uses
two PDUs for redundancy, plug power supplies E1 and E2 to PDU A and power supplies E3 and E4 to PDU B.
2. The power supplies automatically accept any voltage with the published, rated-voltage range. If multiple power
supplies are installed and operating, the power supplies draw approximately equal current from the utility
(electrical supply) and provide approximately equal current to the load.
3. Power draw and heat load vary greatly by configuration. When you plan for an electrical system, it is important
to use the maximum values. However, when you plan for heat load, you can use the IBM Systems Energy
Estimator to obtain a heat output estimate based on a specific configuration. For more information, see The IBM
Systems Energy Estimator website.
4. To calculate the amperage, multiply the kVA by 1000 and divide that number by the operating voltage.
5. Model 8408-E8E and 8408-44E uses four power supply units. Current is shared between the four power supply
units during normal system operation.
6. When operating on only two power supplies, over subscription is not available. In this situation, the maximum
values are 3100 W, 3.16 kVA, and 10580 BTU/hr for the 8408-E8E and 3950 W, 4.0 kVA, and 13481 BTU/hr for
the 8408-44E.
7. AC and HVDC power supplies cannot be mixed in the same server or I/O drawer. IBM recommends that AC
products and HVDC products with HVDC PDUs are installed in separate racks. However, AC and HVDC
products can be supported in the same rack if all grounding (earthing) is done in accordance with the applicable
electrical code or codes. IBM provides documentation for different AC and HVDC products about the
disconnecting means for service. If a different disconnecting means is to be used for service of the equipment in
a rack with AC-powered and DC-powered products, the disconnecting means must be made clear to service.
Table 5. Environment requirements
Environment requirements
Environment (operating)
1
Properties Recommended Allowable
2,3,4
ASHRAE class A3 (Fourth edition)
Airflow direction Front-to-back
Temperature 18.0°C – 27.0°C (64.4°F – 80.6°F) 5.0°C – 40.0°C (41.0°F – 104.0°F)
Low end moisture -9.0°C (15.8°F) dew point -12.0°C (10.4°F) dew point and 8%
relative humidity
High end moisture 60% relative humidity and 15°C
(59°F) dew point
85% relative humidity and 24.0°C
(75.2°F) dew point
Maximum altitude 3050 m (10,000 ft)
Allowable environment (nonoperating)
5
Temperature 5°C - 45°C (45°F - 113°F)
Relative humidity 8% to 85%
Maximum dew point 27.0°C (80.6°F)
8 Site and hardware planning
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