SK0-005 · Question #70
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…
The correct answer is D. Purchase a PDU with a minimum load capacity of 5kVA. To determine the required minimum load capacity for the PDU, calculate the apparent power (kVA) using the nominal voltage and the rate current per phase. The PDU's capacity should meet or exceed this calculated 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
(16 responses)- A6% (1)
- B6% (1)
- C13% (2)
- D75% (12)
Why each option
To determine the required minimum load capacity for the PDU, calculate the apparent power (kVA) using the nominal voltage and the rate current per phase. The PDU's capacity should meet or exceed this calculated value.
A 2kVA PDU is insufficient as the calculated minimum load capacity required is approximately 4.992 kVA.
A 3kVA PDU is insufficient as the calculated minimum load capacity required is approximately 4.992 kVA.
A 4kVA PDU is insufficient as the calculated minimum load capacity required is approximately 4.992 kVA, meaning a 5kVA PDU is the next adequate step up.
The load capacity in kVA is calculated by multiplying the nominal voltage (208V) by the rated current per phase (24A). This calculation yields 208V * 24A = 4992 VA, which is 4.992 kVA. Therefore, a PDU with a minimum load capacity of 5kVA is required to safely support the specified load and adhere to the 80% rule for continuous current draw on a 30A circuit.
Concept tested: PDU load capacity calculation (kVA)
Source: https://www.eaton.com/content/dam/eaton/products/backup-power-ups-surge-it-power-distribution/power-distribution-units/eaton-pdu-guide.pdf
Topics
Community Discussion
No community discussion yet for this question.