This Standard specifies pathway and space design and construction practices in support of telecommunications media and equipment within buildings.  Examples of pathways and spaces in single-tenant and multi-tenant buildings that are addressed in this Standard include: Wireless service entrance pathways, Entrance rooms, Building pathways, Distributor rooms, Access and Service Provider spaces, Distributor enclosures, Service entrance pathways, and Equipment outlet locations.  This Standard has been superseded by ANSI/TIA-569-D.

ANSI/TIA-569-C “Telecommunications Pathways and Spaces” was developed by the TIA TR-42.3 Pathways and Spaces Subcommittee and published in May, 2012.  Significant changes from the previous edition include the adoption of revised temperature and humidity requirements to harmonize with ASHRAE class 1, 2, 3 and 4 requirements and the addition of power separation guidelines and lighting requirements.

ANSI/TIA-569-C-1 “Revised Temperature and Humidity Requirements for Telecommunications Spaces” was developed by the TIA TR-42.3 Pathways and Spaces Subcommittee and published in February, 2013.  This amendment contains revised temperature and humidity requirements that are harmonized with the guidelines contained in ASHRAE Thermal Guidelines for Data Processing Environments, Third Edition.   In this new guideline, ASHRAE classes 1, 2, 3 and 4 were renamed classes A1, A2, B and C, respectively, and two new classes (A3 and A4) were added.  The allowable temperature and humidity ranges for classes A1, A2, B and C and the recommended continuous operating ranges for classes A1, A2, A3 and A4 are unchanged.  The two new classes (A3 and A4) will have significantly wider allowable  temperature and humidity ranges.   The requirements of this Addendum replaced the existing text in clause 6.2 of TIA-569-C.

ANSI/TIA-569-C Content

  • Environmental Compatibility
  • Diversity of Telecommunications Facilities
  • Building Spaces
  • Access Provider and Service Provider Spaces
  • Multi-Tenant Building Spaces
  • Building Pathways
  • Annex on Firestopping and Electromagnetic Noise Reduction Guidelines for Balanced Twisted-Pair Cabling

ANSI/TIA-569-C-1 Content

  • Replacement text for clause 6.2 of TIA-569-C

Lighting Specifications (ANSI/TIA-569-C)

  • Lighting shall be a minimum of 500 lux in the horizontal plane and 200 lux in the vertical plane, measured 1 m (3 ft) above the finished floor in the middle of all aisles between cabinets and racks
  • Lighting fixtures should not be powered from the same electrical distribution panel as the telecommunications equipment in the space
  • Dimmer switches should not be used

Clearance from Equipment (ANSI/TIA-569-C)

  • Front clearance of 1 m (3 ft) shall be provided for installation of equipment
  • Front  clearance of 1.2 m (4 ft) is preferable to accommodate deeper equipment
  • Rear clearance of 0.6 m  (2 ft) of shall be provided for service access at the rear of racks and cabinets
  • Rear clearance of 1 m (3 ft) is preferable

Typical Distributor Room Dimensions (ANSI/TIA-569-C)

Equipment outlets
Minimum floor space
m2 (ft2)
Typical dimensions
m (ft)
Up to 200 15 (150) 3 x 5 (10 x 15)
201 to 800 36 (400) 6 x 6 (20 x 20)
801 to 1600 72 (800) 6 x 12 (20 x 40)
1601 to 2400 108 (1,200) 9 x 12 (30 x 40)

Generic Telecommunications Room Sizing (ANSI/TIA-569-C)

  • There shall be a minimum of one TR per floor

Additional telecommunications rooms (one for each area up to 1000 m2 (10,000 ft2)  should be provided when:

a) the floor area to be served exceeds 1000 m2 (10 000 ft2); or

b) the horizontal distribution distance to the work area exceeds 90 m (295 ft)

Outlet Box Specifications (ANSI/TIA-569-C)

  • 50 mm (2 in) wide, 75 mm (3 in) high, and 64 mm (2.5 in) deep
  • One or two metric designator 21 (trade size ¾) conduits
  • If large conduit required, box size increased
  • Specialty boxes may be used in place of the above as appropriate

Separation from Power Wiring for Balanced Twisted-Pair Cabling (ANSI/TIA-569-C)

  • Specified for 120/230 V 1-phase and 480 V 3-phase power circuits with various current ratings
  • Unshielded cable separation requirements are greater than for shielded cable
  • Separation distances may be halved if the power cables and data cables are installed in separate metallic pathways

Temperature and Humidity Requirements (ANSI/TIA-569-C.1)

  • ASHRAE Class 1, Class 2, Class 3, and Class 4 spaces defined
  • Temperature and humidity specifications provided for distributor rooms, distributor enclosures, entrance rooms or spaces, access provider spaces, service provider spaces, and common distributor rooms as follows:
    • Temperature: 18 – 27°C (64 – 81°F) dry bulb
    • Maximum relative humidity (RH): 60%
    • Minimum dew point: 5.5°C (42°F)
    • Maximum dew point: 15°C (59°F)

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