1 Scope
1.1 This standard covers the design and construction requirements for dedicated telecommunications spaces and the interior pathway systems that connect them within a single building.
NOTE Telecommunications spaces governed by this standard include the per-floor Telecommunications Room (TR), the building Equipment Room (ER), the Entrance Room or Facility (ERF), and the Main and Intermediate Cross-Connect rooms (MDF/MXC and IDF/IXC). (1.1.1)
NOTE Pathway systems governed by this standard include conduit sleeves through walls and floor slabs, cable trays, ladder racks, J-hooks and cable-support hooks, surface raceways, and overhead cable-support systems located within or directly serving those spaces. (1.1.2)
NOTE Room construction elements governed by this standard include enclosure fire-resistance, finishes, backboards, lighting, doors and clearances, dedicated power, and the environmental conditioning serving the spaces. (1.1.3)
1.2 Telecommunications spaces and pathways shall be designed and constructed in accordance with ANSI/TIA-569-E and its Addendum 1, the topology requirements of ANSI/TIA-568.1-D, and the applicable provisions of NFPA 70 (NEC) Articles 770 and 800.
NOTE The following work is excluded from this standard and is governed elsewhere. (1.3)
- Horizontal cabling to work-area outlets, cable termination, and labeling - see Structured Cabling.
- Telecommunications bonding and grounding (TMGB, TGB, bonding conductors, busbar sizing and connection) - see Telecommunications Bonding.
- Cable tray installed in general building spaces outside TR/ER rooms for large cable runs - see Cable Tray.
- Conduit and raceway systems in general electrical distribution corridors - see Raceways And Conduit.
- Electrical switchgear rooms, main electrical distribution rooms, and MV/LV panel rooms - see Electrical Rooms.
- Service-entrance conductors and feeder cables entering the building from outside - see Distribution Feeder Cables.
- Outside-plant (OSP) pathways - underground ductbanks, aerial, and direct-buried runs between buildings.
- Data-center build-outs with raised-floor, precision CRAC cooling, and high-density compute.
- Procurement of active network equipment (switches, routers, patch panels as hardware) - covered by IT procurement specifications.
2 Referenced Standards
2.1 Equipment, materials, and installation shall comply with the latest adopted edition of each of the following unless a specific edition is cited.
2.2 Where referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
| Standard |
Title |
| ANSI/TIA-569-E (Addendum 1, 2022) |
Telecommunications Pathways and Spaces |
| ANSI/TIA-568.1-D |
Generic Telecommunications Cabling for Customer Premises |
| BICSI TDMM |
Telecommunications Distribution Methods Manual |
| ANSI/NECA/BICSI 568 |
Standard for Installing Commercial Building Telecommunications Cabling |
| NFPA 70 (Article 800) |
National Electrical Code - General Requirements for Communications Systems |
| NFPA 70 (Article 770) |
National Electrical Code - Optical Fiber Cables and Raceways |
| NFPA 101 |
Life Safety Code |
| NFPA 13 |
Standard for the Installation of Sprinkler Systems |
| ASHRAE Thermal Guidelines for Data Processing Environments (5th Edition, 2021) |
Thermal Guidelines for Data Processing Environments |
| IBC |
International Building Code (current adopted edition) |
| UL 2043 |
Fire Test for Heat and Visible Smoke Release for Products Installed in Air-Handling Spaces |
NOTE TIA-568 governs cabling and TIA-569 governs pathways and spaces; the two numbers are distinct and both apply to this work. (2.3)
NOTE IEEE 569 addresses utility-substation spatial conditions and is not applicable to telecommunications spaces; it is named here only to prevent confusion with ANSI/TIA-569-E. (2.4)
3 Submittals
3.1 Action Submittals
3.1.1 The Contractor shall submit the following action submittals for review prior to fabrication and installation:
- Shop drawings showing TR/ER room layouts with rack and cabinet positions, working clearances, and backboard coverage.
- Pathway plans and sections showing ladder rack, cable tray, J-hook, and conduit-sleeve routing, sizes, and support spacing.
- Product data for racks, cabinets, ladder rack, cable tray, J-hooks, surface raceway, and firestop systems.
- Conduit-sleeve schedule listing quantity, size, location, and firestop assembly for each TR-to-TR and floor-penetration link.
- Environmental conditioning design data including cooling capacity, setpoints, and 24/7 operating provisions.
- Seismic bracing and anchorage details for racks, cabinets, and overhead pathway where required by the Seismic Design Category.
☑ Room layout shop drawings
☑ Pathway plans and sections
☑ Product data (racks, pathway, firestop)
☑ Conduit-sleeve schedule
☐ Environmental conditioning design data
☐ Seismic bracing and anchorage details
3.2 Closeout Submittals
3.2.1 The Contractor shall submit the following closeout submittals prior to substantial completion:
- Record drawings of as-built room layouts, pathway routing, and conduit-sleeve locations.
- Firestop inspection records for every penetration through rated wall and floor assemblies.
- Environmental conditioning startup, commissioning, and setpoint verification reports.
- Operation and maintenance data for the dedicated cooling equipment.
☑ Record drawings
☑ Firestop inspection records
☑ Conditioning commissioning reports
☑ O&M data for cooling equipment
3.3.1 The Contractor shall submit the following informational submittals:
- Installer qualifications demonstrating BICSI-credentialed supervision of pathway and space installation.
- Manufacturer installation instructions for ladder rack, cable tray, and firestop assemblies.
- Field test reports for rack anchorage and overhead-pathway support where seismic bracing is required.
☑ Installer qualifications
☑ Manufacturer installation instructions
☐ Anchorage and bracing field test reports
4 Quality Assurance
4.1 The installer shall hold current BICSI credentials or provide supervision by a BICSI-credentialed Registered Communications Distribution Designer (RCDD) for the design and layout of telecommunications spaces and pathways.
4.2 Pathway and space installation shall conform to ANSI/NECA/BICSI 568 installation practices, including bend-radius, support-spacing, and fill provisions.
NOTE Firestopping of penetrations through rated wall and floor assemblies is a coordination item among this standard, the fire-protection documents, and the general construction documents, and shall be resolved in shop drawings before any penetration is cut. (4.3)
4.4 All firestop systems shall be installed by an applicator trained by the firestop-system manufacturer and shall match a UL-listed assembly for the rating and penetrant involved.
5 Room Classification and Sizing
NOTE Room type drives size, structural load, and environmental requirements, and shall be established before any room is laid out. (5.1)
NOTE A Telecommunications Room (TR) is the per-floor space that terminates horizontal cabling and houses floor-serving equipment; an Equipment Room (ER) is the building or campus main space (MDF/MXC); an Entrance Room or Facility (ERF) is where outside-plant cabling enters the building. (5.1.1)
NOTE Applying the TR sizing table to an ER produces an undersized room; TIA-569-E provides separate tables for TR and ER, and the correct table for the room type shall be used. (5.1.2)
5.2 The room type shall be classified and sized in accordance with the applicable ANSI/TIA-569-E table for that room type.
● Telecommunications Room (TR) - per-floor closet
○ Equipment Room (ER) - building/campus MDF
○ Entrance Room/Facility (ERF) - OSP entrance
○ Intermediate Cross-Connect (IDF/IXC)
5.3 At least one Telecommunications Room shall be provided on each floor, and additional rooms shall be provided wherever the maximum horizontal cable run would otherwise be exceeded.
NOTE The maximum horizontal cable distance from the TR to any work-area outlet is 90 m (295 ft) per ANSI/TIA-568.1-D; this limit, not headcount, determines the maximum floor area a single TR can serve. (5.3.1)
NOTE Sizing a TR from headcount without verifying the 90 m cable-run rule leaves wings of the floor out of reach and is a common cause of stranded outlets. (5.3.2)
500012000
Default: 10000 sq ft
5.4 Telecommunications Rooms serving stacked floors shall be vertically aligned floor-to-floor so that riser sleeves pass straight through the slab.
NOTE Where TRs are not stacked, riser sleeves must angle through the slab at steep bends that complicate the pull and can violate cable bend-radius limits. (5.4.1)
5.5 The Telecommunications Room minimum floor area shall be as scheduled, not less than the area required by ANSI/TIA-569-E for the served floor area.
NOTE TIA-569-E sets a 10 m² (108 sq ft) floor minimum for buildings up to 500 m² of served floor area, scaling upward; the common commercial-office case is approximately 150 sq ft for a single TR serving up to 10,000 sq ft of floor. (5.5.1)
5.6 The room minimum clear ceiling height shall be as scheduled, not less than 2,440 mm (8 ft).
NOTE A 9 ft clear height is the common design case because it allows an overhead ladder rack plus the 1 ft of clearance required above the rack tops. (5.6.1)
5.7 Equipment shall be arranged for either a single-sided or double-sided layout as scheduled, with the front and rear working clearances required by NFPA 70 and NFPA 101 maintained at every rack and cabinet.
● Single-sided (equipment on one wall/row)
○ Double-sided (equipment on two opposing rows)
6 Room Construction and Finishes
6.1 The room enclosure shall be constructed to the fire-resistance rating required by the IBC for its occupancy and location, and all penetrations of rated assemblies shall be firestopped to maintain that rating.
NOTE Backboards shall be provided on the room walls to mount terminations, cross-connect hardware, and wall-mount equipment. (6.2)
NOTE Most authorities having jurisdiction require listed fire-retardant-treated (FRT) plywood or two coats of fire-retardant paint on all six surfaces; standard untreated plywood is commonly rejected. (6.2.1)
6.3 Backboards shall be 19 mm (3/4 in) A-C grade fire-retardant-treated plywood.
6.4 Backboards shall be securely fastened to the wall structure with the finished (A) face exposed and shall be field-painted white or left natural as scheduled.
● 3/4 in A-C fire-retardant-treated plywood
○ 3/4 in plywood with two coats fire-retardant paint (six surfaces)
6.5 Backboard wall coverage shall be as scheduled.
NOTE In an ER, all non-rack walls are commonly lined floor-to-ceiling; in a TR, a single full 4 ft x 8 ft sheet on one wall is the common minimum. (6.5.1)
● One full 4x8 sheet on one wall (TR minimum)
○ One full wall lined floor-to-ceiling
○ All non-rack walls lined floor-to-ceiling (ER)
6.6 Room finishes shall be sealed to limit dust; floors shall receive a sealed or anti-static finish and shall not be carpeted.
6.7 A bonding busbar location shall be provided on the backboard for connection of rack and pathway bonding conductors.
NOTE Sizing, connection, and grounding-electrode-conductor requirements for the busbar (TMGB/TGB) are owned by
Telecommunications Bonding; this standard requires only that the mounting location and backboard space be provided.
(6.7.1) 7 Pathways
NOTE Interior pathways shall be selected, sized, and supported to carry the backbone and horizontal cabling between and within telecommunications spaces without exceeding fill or bend-radius limits. (7.1)
7.2 The pathway type within and between telecommunications spaces shall be as scheduled and as shown on the drawings.
☑ Overhead ladder rack
☐ Cable tray
☑ Conduit sleeves (floor/wall penetrations)
☐ J-hooks / cable-support hooks
☐ Surface raceway
7.3 Ladder Rack and Cable Tray
7.4 Ladder rack and cable tray shall be galvanized steel or aluminum, sized for the installed cable bundle plus growth.
7.5 Ladder rack and cable tray fill shall not exceed 50% of the usable cross-sectional area per ANSI/TIA-569-E.
NOTE Designing to 40% fill rather than the 50% maximum is the common practice because it reserves capacity for moves, adds, and changes over the life of the room. (7.5.1)
7.6 Ladder rack and cable tray width shall be as scheduled.
7.7 Ladder rack and cable tray shall be supported at intervals not exceeding 1.5 m (5 ft) on center.
NOTE TIA-569-E requires a maximum 5 ft support spacing; general contractors commonly assume support at the structural bay (10 ft o.c.), which generates an RFI to add intermediate hangers. (7.7.1)
7.8 J-Hooks and Cable Support
7.9 J-hooks shall support cable bundles only where ladder rack or tray is not provided, and shall not be used as the primary backbone pathway between rooms.
7.10 J-hooks shall be installed at a maximum spacing of 1.5 m (5 ft) on center.
NOTE A 4 ft on-center spacing is the common installed practice because it limits cable sag between supports below the value that distorts the bundle. (7.10.1)
7.11 J-hook depth shall be sized for the installed bundle and shall maintain the cable manufacturer's minimum bend radius at every support.
7.12 Conduit Sleeves and Floor Penetrations
NOTE Conduit sleeves shall connect stacked telecommunications spaces vertically and shall pass cabling through rated wall and floor assemblies. (7.13)
7.14 Conduit sleeves shall be a minimum of 4 in (102 mm) nominal inside diameter.
7.15 A minimum of four conduit sleeves shall be provided per TR-to-TR riser link.
NOTE Four sleeves is the TIA-569-E minimum; six to eight are common in practice once IT counts the cable types - voice backbone, data backbone, fiber riser, access control, AV, and CATV - that must be segregated. (7.15.1)
7.16 Conduit sleeves shall be located near a room corner in a grouped pattern, positioned and routed as shown on the drawings. The sleeve layout location is shown at TR riser sleeve location. NOTE The common arrangement is four 4 in conduits installed in a 2 x 2 pattern near the room corner so the riser stack does not encroach on rack working clearance. (7.16.1)
7.17 Each conduit sleeve shall be furnished with a pull string of not less than 90 kg (200 lb) tensile rating.
NOTE Missing pull strings stop the cabling contractor at the first riser and are a routine cause of schedule delay. (7.17.1)
7.18 Every conduit sleeve through a rated assembly shall be firestopped with a UL-listed firestop sleeve assembly or intumescent collar.
NOTE Fire-rated floor and wall assemblies require a listed firestop at every penetration; an un-firestopped sleeve defeats the rated assembly and fails inspection. (7.18.1)
● Fire-rated sleeve assembly with intumescent insert
○ Foam-and-intumescent collar (re-enterable)
7.19 Surface Raceway
7.20 Surface raceway shall be provided only where cabling is exposed on finished walls and no concealed pathway is available, and shall maintain the cable bend radius at all fittings.
8 Racks and Cabinets
NOTE Racks and cabinets shall be 19 in EIA standard, sized for the equipment served plus rack-unit growth, and arranged for the working clearances required by NFPA 70 and NFPA 101. (8.1)
8.2 The rack or cabinet type shall be as scheduled.
○ Wall-mount open-frame rack (2-post)
● Free-standing open-frame rack (4-post)
○ Enclosed floor-standing cabinet
○ Wall-mount enclosure/cabinet
8.3 The rack or cabinet usable height (rack units) shall be as scheduled.
8.4 Free-standing racks and cabinets shall be anchored to the floor structure by the manufacturer's approved anchorage method.
NOTE Unanchored free-standing racks tip during front-of-rack maintenance; in seismic zones the AHJ may withhold the certificate of occupancy without approved rack anchorage details. (8.4.1)
8.5 In IBC Seismic Design Category C and above, racks, cabinets, and overhead pathway shall be seismically braced and anchored in accordance with the structural drawings.
● No (Seismic Design Category A or B)
○ Yes (Seismic Design Category C or above)
9 Environmental and Service Conditions
NOTE Telecommunications spaces shall be conditioned to maintain the temperature and humidity required for continuous operation of the installed active equipment. (9.1)
NOTE The typical design class for a commercial TR is ASHRAE Class A1, not the wider data-center classes; TIA-569-E Addendum 1 aligns its environmental setpoints with ASHRAE's 5th edition. (9.1.1)
9.2 Temperature
9.3 The space shall be maintained within the ASHRAE Class A1 inlet range of 18 °C to 27 °C (64 °F to 80 °F).
9.4 The cooling system shall be controlled to a design setpoint as scheduled.
9.5 Humidity
9.6 The space shall be maintained within a dew point of 5.5 °C to 15 °C (42 °F to 59 °F) per ANSI/TIA-569-E Addendum 1.
9.7 The space relative humidity shall be maintained within the scheduled design band.
9.8 Cooling System
NOTE A dedicated conditioning unit drives whether the room stays within range when the building system is off; this selection shall be made deliberately and not left to the building HVAC by default. (9.9)
NOTE Building VAV systems are commonly shut down nights and weekends; an interior TR with no exterior wall served only by building HVAC will overheat without 24/7 cooling. (9.9.1)
9.10 The space conditioning source shall be as scheduled.
● Dedicated split-system HVAC (24/7 duty)
○ Building HVAC with supplemental cooling
○ Building HVAC only (perimeter room with exterior wall)
9.11 A dedicated 24/7 conditioning unit shall be provided where the telecommunications space is an interior room without an exterior wall.
9.12 The cooling capacity shall be sized against the actual equipment heat load and shall not be less than the scheduled rule-of-thumb allowance per rack or cabinet.
NOTE The 500 to 750 BTU/hr per rack rule-of-thumb is a starting allowance only; the installed-equipment heat load governs and shall be verified against the IT load schedule. (9.12.1)
500750
Default: 750 BTU/hr
9.13 Sprinkler Protection
NOTE Sprinkler coverage shall be coordinated with the fire-protection documents per NFPA 13. (9.14)
NOTE Silence on sprinkler type defaults the room to wet-pipe; some owners require pre-action or dry-pipe to protect equipment from incidental discharge, and the requirement shall be stated explicitly. (9.14.1)
9.15 The sprinkler system type serving the telecommunications space shall be as scheduled.
● Wet-pipe (default building system)
○ Pre-action (double-interlock)
○ Dry-pipe
10 Lighting
NOTE Lighting shall provide a maintained illuminance adequate for terminating and servicing cabling at the rack and backboard. (10.1)
NOTE A specification that says only "provide lighting" without a maintained illuminance commonly yields a single lamp, forcing the technician to work by flashlight. (10.1.1)
10.2 Lighting shall provide a minimum maintained illuminance of 500 lux (50 fc) at a 760 mm (30 in) work plane above finished floor, measured per BICSI TDMM.
10.3 Luminaires shall be LED and shall be positioned to illuminate the front and rear of racks and the full backboard without being blocked by overhead pathway.
NOTE Two 2-lamp LED troffers serve a typical 10 ft x 12 ft TR; larger rooms scale the count to hold the illuminance at the work plane. (10.3.1)
11 Power
NOTE Telecommunications spaces shall be served by dedicated branch circuits that are not shared with building, lighting, or janitorial loads. (11.1)
NOTE Sharing TR outlets with janitor or building circuits causes nuisance tripping and violates NEC best practice for critical loads. (11.1.1)
11.2 A minimum of two dedicated 20 A, 120 V duplex receptacles shall be provided on each wall of the room.
11.3 One dedicated 20 A circuit shall be provided at each rack or cabinet position.
11.4 Power receptacles and communications cabling shall maintain the separation required by NFPA 70 Article 800.
12 Doors and Access
12.1 The room door shall provide a minimum 914 mm (36 in) clear opening and a minimum 2,032 mm (80 in) height.
12.2 The door shall be solid-core or hollow-metal and shall be fire-rated to match the enclosure rating where the wall is rated.
12.3 The door shall swing out into the corridor where egress and clearance permit.
NOTE An inswing door reduces usable room area and can conflict with the front-of-rack working clearance; outswing is preferred where the corridor and egress allow it. (12.3.1)
12.4 The door hardware shall be as scheduled.
○ Keyed cylinder
○ Proximity-card / access-control reader
● Keyed cylinder with access-control reader
● Outswing into corridor (preferred)
○ Inswing into room
13 Installation
13.1 Pathways and spaces shall be installed in accordance with ANSI/NECA/BICSI 568 and the manufacturer's instructions.
13.2 Cables routed in pathways that penetrate environmental-air plenums shall be plenum-rated (CMP) in accordance with NFPA 70 Article 800.24.
NOTE A standard TR is not itself a plenum, but where a pathway penetrates into a plenum space the penetrating cable must be plenum-rated. (13.2.1)
13.3 Communications cabling and pathways shall maintain the separation from power circuits required by NFPA 70 Article 800.
13.4 Optical fiber cables and raceways shall be installed in accordance with NFPA 70 Article 770.
13.5 Bend radius shall be maintained at every support, fitting, sleeve, and termination per the cable manufacturer's instructions and ANSI/NECA/BICSI 568.
13.6 All penetrations of rated wall and floor assemblies shall be firestopped to the rating of the assembly using a UL-listed system before the work is concealed.
14 Testing
14.1 Rack and cabinet anchorage shall be field-verified against the approved anchorage details prior to loading equipment.
14.2 Where seismic bracing is required, overhead-pathway and rack bracing shall be inspected and documented before the cabling installation proceeds.
14.3 Each firestopped penetration shall be inspected and recorded against the listed firestop assembly.
14.4 Environmental conditioning shall be commissioned and the temperature and humidity setpoints verified under load before substantial completion.
15 Delivery, Storage, and Handling
15.1 Racks, cabinets, ladder rack, cable tray, and backboard materials shall be delivered in the manufacturer's original packaging and stored under cover, protected from moisture and physical damage.
15.2 Fire-retardant-treated plywood shall be kept dry and shall not be installed if it shows signs of water damage or delamination.
15.3 Firestop materials shall be stored within the temperature range stated by the manufacturer and shall not be used past their shelf life.
16 Warranty
16.1 The Contractor shall warrant pathway and space materials and installation against defects in materials and workmanship for the scheduled warranty period.
17 Spare Parts
17.1 The Contractor shall furnish spare J-hooks, mounting hardware, and firestop materials in the scheduled quantity for owner maintenance.
010
Default: 5 % of installed