RCDD · Question #95
The recommended MINIMUM number of conduits connecting two located on the same floor is:
The correct answer is A. One; 75 mm (trade size 3). For two telecommunications rooms located on the same floor, the recognized minimum pathway requirement is a single 75 mm (trade size 3) conduit.
Question
The recommended MINIMUM number of conduits connecting two located on the same floor is:
Options
- AOne; 75 mm (trade size 3)
- BTwo; 75 mm (trade size 3)
- COne; 100 mm (trade size 4)
- DTwo; 100 mm (trade size 4)
How the community answered
(32 responses)- A81% (26)
- B9% (3)
- C3% (1)
- D6% (2)
Why each option
For two telecommunications rooms located on the same floor, the recognized minimum pathway requirement is a single 75 mm (trade size 3) conduit.
Per BICSI TDMM and TIA-569, one 75 mm (trade size 3) conduit is the specified minimum for same-floor TR-to-TR intra-building backbone pathways. This size accommodates horizontal backbone cabling bundles while keeping the pathway count at the minimum threshold required by the standard.
Two conduits exceed the stated minimum for same-floor connections; the standard requires only one as the minimum quantity.
A 100 mm (trade size 4) conduit exceeds the minimum required size for same-floor TR connections per the applicable pathway standard.
Both the quantity (two) and the size (100 mm) exceed the minimum standard for same-floor TR-to-TR conduit pathways.
Concept tested: Minimum conduit size and count between same-floor TRs
Source: https://www.tiaonline.org/standard/tia-569/
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