RCDD · Question #82
You are placing two 423 mm (19 in) relay racks with a 152 mm (6 in) vertical management panel on each end and a 12 in vertical cable management panel between the racks. The rack lineup begins…
The correct answer is D. 2.4 m (8 ft) x 3.0 m (10 ft). Calculating minimum telecommunications room size requires summing the total rack lineup width and applying required front working clearance per industry standards.
Question
You are placing two 423 mm (19 in) relay racks with a 152 mm (6 in) vertical management panel on each end and a 12 in vertical cable management panel between the racks. The rack lineup begins against a wall in the room. What is the MINIMUM room size required?
Options
- A1.83 m (6 ft) x 2.4 m (8 ft)
- B2.1 m (7 ft) x 2.4 m (8 ft)
- C2.4 m (8 ft) x 2.4 m (8 ft)
- D2.4 m (8 ft) x 3.0 m (10 ft)
- E3.0 m (10 ft) x 3.0 m (10 ft)
How the community answered
(44 responses)- A11% (5)
- B2% (1)
- C2% (1)
- D75% (33)
- E9% (4)
Why each option
Calculating minimum telecommunications room size requires summing the total rack lineup width and applying required front working clearance per industry standards.
A 6 ft x 8 ft room is too narrow to accommodate the 62-inch rack lineup with adequate side clearance and too shallow to provide the required front working clearance.
A 7 ft x 8 ft room provides slightly more width but remains too shallow at 8 ft to meet minimum front clearance requirements for the full rack configuration.
An 8 ft x 8 ft room has adequate width for the rack lineup but is insufficient in depth to maintain the required working clearance in front of the racks plus door clearance.
The rack lineup totals 62 inches - two 19-inch racks (38 in) plus two 6-inch end panels (12 in) plus one 12-inch middle panel (12 in) - requiring a room width of at least 8 ft (2.4 m) to accommodate the lineup placed against the wall with adequate side clearance. A minimum depth of 10 ft (3.0 m) is required to provide the mandated front working clearance (minimum 36 to 48 inches) in addition to the rack depth of approximately 24 inches, plus door swing and circulation space. Rooms shallower than 3.0 m would not satisfy minimum accessibility and working clearance requirements for this rack configuration.
A 3.0 m x 3.0 m room exceeds the minimum required dimensions for this rack configuration and is therefore not the correct minimum room size.
Concept tested: Telecommunications room sizing for relay rack configurations
Source: https://tiaonline.org/what-we-do/standards/
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