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BICSI

RCDD · Question #45

In the ceiling zone method of distribution, the usable floor area should be divided into zones each measuring:

The correct answer is C. 23 sq m (250 sq ft) to 84 sq m (904 sq ft). In the ceiling zone method, each zone of usable floor area must measure between 23 sq m (250 sq ft) and 84 sq m (904 sq ft) per BICSI TDMM guidelines. This range balances practical cable reach from a zone enclosure with efficient floor coverage.

Information Transport Systems (ITS) Distribution

Question

In the ceiling zone method of distribution, the usable floor area should be divided into zones each measuring:

Options

  • A9.3 sq m (100 sq ft) to 23 sq m (250 sq ft)
  • B23 sq m (250 sq ft) to 56 sq m (600 sq ft)
  • C23 sq m (250 sq ft) to 84 sq m (904 sq ft)
  • D56 sq m (600 sq ft) to 84 sq m (904 sq ft)
  • E56 sq m (600 sq ft) to 100 sq m (1,100 sq ft)

How the community answered

(51 responses)
  • A
    6% (3)
  • B
    2% (1)
  • C
    80% (41)
  • D
    10% (5)
  • E
    2% (1)

Why each option

In the ceiling zone method, each zone of usable floor area must measure between 23 sq m (250 sq ft) and 84 sq m (904 sq ft) per BICSI TDMM guidelines. This range balances practical cable reach from a zone enclosure with efficient floor coverage.

A9.3 sq m (100 sq ft) to 23 sq m (250 sq ft)

9.3-23 sq m (100-250 sq ft) defines zones that are too small, which would require an impractical number of zone enclosures per floor and drives up cost unnecessarily.

B23 sq m (250 sq ft) to 56 sq m (600 sq ft)

23-56 sq m (250-600 sq ft) only covers the lower half of the permitted range and incorrectly excludes valid zones up to 84 sq m (904 sq ft) allowed by BICSI standards.

C23 sq m (250 sq ft) to 84 sq m (904 sq ft)Correct

BICSI TDMM specifies that ceiling zone distribution zones must range from 23 sq m (250 sq ft) to 84 sq m (904 sq ft) to ensure cables from a zone enclosure or consolidation point can adequately serve all workstations within the zone. Zones smaller than 23 sq m create an excessive number of distribution points, while zones larger than 84 sq m exceed the practical horizontal cable reach from a single overhead enclosure. This range optimizes both infrastructure cost and cabling flexibility.

D56 sq m (600 sq ft) to 84 sq m (904 sq ft)

56-84 sq m (600-904 sq ft) captures only the upper portion of the permitted range and incorrectly excludes zones as small as 23 sq m (250 sq ft) from consideration.

E56 sq m (600 sq ft) to 100 sq m (1,100 sq ft)

56-100 sq m (600-1,100 sq ft) exceeds the BICSI maximum zone ceiling of 84 sq m (904 sq ft), which would cause horizontal cabling to exceed manageable distribution distances from a single overhead enclosure.

Concept tested: Ceiling zone method zone area sizing

Topics

#ceiling zone distribution#zone cabling method#floor area zones#horizontal distribution

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