RCDD · Question #93
In a telecommunications room (TR), the MINIMUM bottom edge height recommendation for mounting plywood on the wall is ________ above AFF.
The correct answer is C. 200 mm (8 in). Wall-mounted plywood (backboards) in a TR must have their bottom edge at least 200 mm (8 in) above finished floor level to guard against moisture and floor-level hazards.
Question
In a telecommunications room (TR), the MINIMUM bottom edge height recommendation for mounting plywood on the wall is ________ above AFF.
Options
- A51 mm (2 in)
- B152 mm (6 in)
- C200 mm (8 in)
- D305 mm (12 in)
- E410 mm (16 in)
How the community answered
(58 responses)- A16% (9)
- B2% (1)
- C72% (42)
- D3% (2)
- E7% (4)
Why each option
Wall-mounted plywood (backboards) in a TR must have their bottom edge at least 200 mm (8 in) above finished floor level to guard against moisture and floor-level hazards.
51 mm (2 in) provides virtually no protection from floor-level moisture or minor flooding and falls far below the recognized minimum standard.
152 mm (6 in) is below the 200 mm minimum threshold specified in cabling infrastructure standards for TR wall-mounted backboards.
The 200 mm (8 in) AFF minimum is the industry-standard recommendation per BICSI TDMM and TIA-569 for TR wall backboards. This height provides adequate clearance from floor-level water intrusion while still leaving maximum usable mounting area for equipment and termination hardware.
305 mm (12 in) exceeds the minimum, unnecessarily reducing the available low-wall mounting space without an offsetting benefit.
410 mm (16 in) also exceeds the minimum and further restricts usable backboard area without justification from the standard.
Concept tested: TR wall backboard minimum mounting height above AFF
Source: https://www.tiaonline.org/standard/tia-569/
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