nerdexam
BICSI

RCDD · Question #280

It is important to keep all underfloor cabling systems very neat and orderly. Cabling systems must be managed to ensure that air flow is not impeded by the height or volume of underfloor cabling…

The correct answer is D. Route the copper cables in the hot aisle and route the power cabling in the cold aisle. Routing copper communications cabling in the hot aisle and power cabling in the cold aisle physically separates the two cable types under the floor, preventing electromagnetic interference and preserving airflow.

ITS Spaces

Question

It is important to keep all underfloor cabling systems very neat and orderly. Cabling systems must be managed to ensure that air flow is not impeded by the height or volume of underfloor cabling. Keeping copper communications cabling properly separated from is one design approach. To resolve this:

Options

  • APower cabling should be routed in the space below the floor in either hot or cold aisle
  • BRoute the copper cables in the cold aisle and route the power cabling in the hot aisle
  • CPower cabling should be routed in the overhead space
  • DRoute the copper cables in the hot aisle and route the power cabling in the cold aisle
  • ECopper cabling can be routed in either hot or cold aisles without any consequence in performance of

How the community answered

(33 responses)
  • A
    6% (2)
  • B
    12% (4)
  • D
    79% (26)
  • E
    3% (1)

Why each option

Routing copper communications cabling in the hot aisle and power cabling in the cold aisle physically separates the two cable types under the floor, preventing electromagnetic interference and preserving airflow.

APower cabling should be routed in the space below the floor in either hot or cold aisle

Allowing power cabling to be routed in either aisle without specifying separation from copper cables does not resolve the EMI interference concern stated in the question.

BRoute the copper cables in the cold aisle and route the power cabling in the hot aisle

Routing copper cables in the cold aisle places data cabling directly in the path of conditioned air delivery, risking obstruction of airflow through perforated tiles.

CPower cabling should be routed in the overhead space

Routing power cabling overhead is a legitimate design alternative but does not address the underfloor cabling separation problem described in the scenario.

DRoute the copper cables in the hot aisle and route the power cabling in the cold aisleCorrect

Keeping copper communications cables in the hot aisle and power cables in the cold aisle maintains physical separation that reduces EMI from power conductors onto data signals. This arrangement also preserves cold aisle underfloor space for conditioned air delivery through perforated floor tiles, preventing the volume or height of cabling from blocking airflow to server inlets.

ECopper cabling can be routed in either hot or cold aisles without any consequence in performance of

Copper communications cabling routed adjacent to power cabling without separation is subject to electromagnetic interference, which does degrade signal performance.

Concept tested: Underfloor data center cabling separation hot and cold aisle

Source: https://www.bicsi.org/standards/available-standards-store/single-purchase/bicsi-002-2019-data-center-design-and-implementation-best-practices

Topics

#underfloor cabling#airflow management#hot aisle cold aisle#data center

Community Discussion

No community discussion yet for this question.

Sign up to join the discussion
Full RCDD Practice