RCDD · Question #8
You are required by architectural design to place UTP cables in the same space as unshielded power lines. How should you proceed with the placement of your cables?
The correct answer is B. You should provide a minimum separation of 610 mm (24 in). TIA-569 cabling standards require a minimum separation of 610 mm (24 in) between UTP data cables and unshielded power conductors to prevent EMI coupling.
Question
You are required by architectural design to place UTP cables in the same space as unshielded power lines. How should you proceed with the placement of your cables?
Options
- ARequire the architect/electrical engineer to place shielding in the space before your UTP is placed.
- BYou should provide a minimum separation of 610 mm (24 in).
- CYou should provide a minimum separation of 229 mm (9 in).
- DYou should provide a minimum of two 101 mm (4 in) RMC.
How the community answered
(21 responses)- A10% (2)
- B71% (15)
- C5% (1)
- D14% (3)
Why each option
TIA-569 cabling standards require a minimum separation of 610 mm (24 in) between UTP data cables and unshielded power conductors to prevent EMI coupling.
Requiring the architect or electrical engineer to add shielding to the space is not the standard procedural response defined by TIA-569 for this scenario, and is unnecessary when the required 610 mm separation distance can be achieved.
TIA-569 (Telecommunications Pathways and Spaces) specifies a 610 mm (24 in) minimum separation when UTP cables run parallel to unshielded power conductors. This distance is required to ensure the electromagnetic field generated by the power lines has attenuated enough to prevent inductive and capacitive coupling that would degrade signal integrity on the UTP, which has no metallic shielding of its own to reject interference.
229 mm (9 in) is an insufficient separation distance for UTP running parallel to unshielded power conductors and falls well below the 610 mm minimum required by TIA-569 for this configuration.
Specifying two 101 mm (4 in) rigid metal conduits (RMC) is not the correct standard response for cable separation from unshielded power lines, as it does not address the required physical distance and misapplies conduit specifications.
Concept tested: TIA-569 UTP separation from unshielded power conductors
Source: https://tiaonline.org/what-we-do/standards/
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