Dell T420 Technical Manual
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46 PowerEdge T420 Technical Guide
Specification
Redundant
1100W
Redundant
750W
Redundant
495W
Non-redundant
550W
Maximum inrush
current
2
55A
55A
55A
55A
1
Auto-ranging
2
Under typical line conditions and over the entire system ambient operating range, the inrush current may reach
55A per power supply for 10ms or less.
Environmental specifications
Table 26 details the environmental specifications for the T420. For additional information about
environmental measurements for specific system configurations, see
Dell.com/environmental_datasheets.
Table 26. Environmental specifications
Fresh Air: temperature, humidity, altitude de-rating
Continuous
operation
10°C to 35°C (50°F to 95°F) at 10% to 80% relative humidity with 26°C (78.8°F) maximum
dew point (maximum wet bulb temperature). De-rate maximum allowable dry bulb
temperature at 1°C per 300m above 950m (1°F per 547 ft above 3117 ft).
Expanded
operation
When operating in the expanded temperature range, system performance may be impacted,
and ambient temperature warnings may be reported on the LCD and in the System Event
Log.
≤ 10% of annual operating hours: 5°C to 10°C and 35°C to 40°C (with no direct sunlight on
the equipment) at 5% to 85% relative humidity with 26°C dew point (maximum wet bulb
temperature). Outside the standard operating temperature (10°C to 35°C), the system can
operate down to 5°C or up to 40°C for a maximum of 10% of its annual operating hours. For
temperatures between 35°C and 40°C (95°F to 104°F), de-rate maximum allowable dry bulb
temperature by 1°C per 175m above 950m (1°F per 319 ft above 3117 ft).
≤ 1% of annual operating hours: –5°C to 5°C and 40°C to 45°C (with no direct sunlight on
the equipment) at 5% to 90% relative humidity with 26°C dew point (maximum wet bulb
temperature). Outside the standard operating temperature (10°C to 35°C), the system can
operate down to –5°C or up to 45°C for a maximum of 1% of its annual operating hours. For
temperatures between 40°C and 45°C (104°F to 113°F), de-rate maximum allowable dry bulb
temperature by 1°C per 125m above 950m (1°F per 228 ft above 3117 ft).
Expanded operation restrictions:
No cold startup below 5°C
Maximum altitude for the operating temperature must be 3050m (10,000ft)
Up to two redundant fans (back fans required)
Redundant PSU configuration required
Not supported:
GPU
LRDIMM
Peripheral cards not qualified by Dell
Peripheral cards greater than 25W