SK0-004 · Question #744
A server technician is setting up a 42U rack. The technician needs to install a 5U cable tray spacer at the 42U position. Which of the following is the amount of space the 5U cable tray spacer is…
The correct answer is C. 8.75in (22.2cm). A single rack unit (1U) equals 1.75 inches per the EIA-310 standard, so a 5U component occupies exactly 8.75 inches of vertical rack space.
Question
A server technician is setting up a 42U rack. The technician needs to install a 5U cable tray spacer at the 42U position. Which of the following is the amount of space the 5U cable tray spacer is taking up?
Options
- A5.75in (14.6cm)
- B6.75in (17.1cm)
- C8.75in (22.2cm)
- D11.75in (29.8cm)
How the community answered
(27 responses)- A4% (1)
- B7% (2)
- C85% (23)
- D4% (1)
Why each option
A single rack unit (1U) equals 1.75 inches per the EIA-310 standard, so a 5U component occupies exactly 8.75 inches of vertical rack space.
5.75 inches does not correspond to any standard U calculation and would represent approximately 3.3U, not 5U.
6.75 inches represents approximately 3.86U and does not align with the 1.75 inches-per-U EIA-310 standard.
The EIA-310 rack standard defines 1U as 1.75 inches (44.45mm). Multiplying 5 units by 1.75 inches yields exactly 8.75 inches (22.2cm), which is the precise vertical space a 5U cable tray spacer occupies in the rack.
11.75 inches represents approximately 6.7U, which exceeds the stated 5U specification of the cable tray spacer.
Concept tested: Rack unit height measurement and EIA-310 standard
Source: https://www.eia.org/publications/standards/EIA/EIA-310-E.pdf
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