SK0-004 · Question #884
A server technician is procuring and installing a single-phase rack PDU that will meet the following requirements: Maximum line current per phase: 30A Rate current per phase: 24A Maximum current…
The correct answer is D. Purchase a PDU with a minimum load capacity of 5kVA. PDU load capacity is determined by multiplying the rated current per phase by the nominal voltage; the PDU selected must meet or exceed that value.
Question
A server technician is procuring and installing a single-phase rack PDU that will meet the following requirements:
Maximum line current per phase: 30A Rate current per phase: 24A Maximum current draw: 6 x 16A Nominal voltage: 208V Based on these requirements, which of the following can be implied regarding load capacity?
Options
- APurchase a PDU with a minimum load capacity of 2kVA.
- BPurchase a PDU with a minimum load capacity of 3kVA.
- CPurchase a PDU with a minimum load capacity of 4kVA.
- DPurchase a PDU with a minimum load capacity of 5kVA.
How the community answered
(17 responses)- A12% (2)
- B6% (1)
- C24% (4)
- D59% (10)
Why each option
PDU load capacity is determined by multiplying the rated current per phase by the nominal voltage; the PDU selected must meet or exceed that value.
2kVA equates to roughly 9.6A at 208V, far below the 24A rated current and dangerously undersized for this load.
3kVA equates to roughly 14.4A at 208V, still well below the 24A rated current requirement.
4kVA equates to roughly 19.2A at 208V, which does not meet the 24A rated current and would overload the PDU under normal sustained use.
Using the rated current per phase of 24A at the nominal voltage of 208V gives 24 x 208 = 4,992 VA, which requires a PDU rated for at least 5kVA. The rated current (not the maximum line current) is used because it represents the sustained safe operating load the PDU must support. A 5kVA PDU is the minimum that covers the 4,992 VA load requirement.
Concept tested: PDU load capacity calculation using rated current and voltage
Source: https://www.schneider-electric.com/en/work/products/product-launch/power-distribution/
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