Generic Lease Specification for Office Building Telecommunications Spaces, Pathways and Grounding System
- Telecommunications Spaces
- Horizontal Telecommunications Raceway System
- Backbone Telecommunications Raceway System
- Service Entrance Pathway
- Telecommunications Grounding and Bonding System
Note: This document is intended to apply only in situations where the Crown is leasing all the office space in a building for a long period of time.
This specification requires a telecommunications infrastructure that complies with ANSI/TIA/EIA-569-A "Commercial Building Standard for Telecommunications Pathways and Spaces" (569-A) and addenda. It also requires the installation of a telecommunications grounding and bonding infrastructure that complies with the requirements of Joint Standard "Commercial Building Grounding (Earthing) and Bonding Requirements For Telecommunications", ANSI-J-STD-607-A-2002 (607-A). Note that this latter standard replaces ANSI/TIA/EIA-607 referenced in 569-A.
Some requirements of these standards are repeated for clarity in this specification. However, all the applicable requirements of these standards must be respected unless explicitly stated otherwise in this specification. Some additional requirements and clarifications are also provided.
These standards use the word "should" to provide reasonable latitude to the designer. However, unless stated otherwise in this specification, the word "should" is to be replaced by the word "shall" every place it is used in Clauses 4 through 10 inclusive of 569-A and Clauses 5 through 8 inclusive of 607-A.
Note that these standards typically use "soft" conversion from imperial to metric units. This document uses only metric measurements to avoid possible confusion.
The telecommunications infrastructure of spaces and pathways in a typical building is illustrated in Figure 5.2-1 of 569-A. However, this diagram does not illustrate horizontal pathways. A typical telecommunications grounding and bonding system is illustrated in Figure 2.1-1 of 607-A.
This specification uses the term "telecommunications room" instead of "telecommunications closet" used in 569-A. This usage is consistent with later addenda to 569-A and later related ANSI/TIA/EIA standards that have replaced the word "closet" with "room".
2. Telecommunications Spaces
Provide an infrastructure of telecommunications spaces [including Telecommunications Rooms, Main Terminal / Equipment Rooms and Entrance Rooms] meeting the requirements of 569-A. As required by 569-A, these rooms shall be dedicated to the telecommunications function and shall not contain equipment used for electrical distribution to other portions of the building.
Every building has at least one telecommunications space.
2.2 Main Terminal / Equipment and Entrance Rooms
Provide one telecommunications main terminal / equipment room (MT/ER) to 569-A. As required by 569-A, the area of this room shall be at least 0.7% of the "net area" (the useable area of the building or the area of the building that it serves), and it shall not be less than 14 square metres. The room shall be rectangular in shape and the length of the longer wall shall not be greater than 3 times the length of the shorter wall and no wall may be less than 3 metres long.
Provide a telecommunications entrance room that will be used to terminate cables and house equipment of the telecommunications carriers. It is preferably a separate dedicated room close to the MT/ER, but it may be combined with the MT/ER, especially in smaller buildings.
If the entrance room is part of the MT/ER, the area of the MT/ER shall be increased by 15% of that specified in 2.2.1 above, and shall not be smaller than 20 square metres. In such cases, the entrance space must be located in an area that is separated by a barrier (such as a wire mesh) from the remainder of the room and shall be accessible without entering the remainder of the MT/ER. The intent of this requirement is to permit personnel of the telecommunications carriers to access their equipment (that is located in the portion used as the entrance room) but prevent them from having access to the lessee's equipment that is located in the main portion of the room.
If the entrance room is a separate room (recommended), the area of this room shall be 20% of the area of the MT/ER as specified in 2.2.1 above and no less than 10 square metres. The room shall be rectangular in shape, the length of the longer wall shall not be greater than 3 times the length of the shorter wall and no wall shall be less than 3 metres long.
Continuous 7/24/365 cooling shall be provided in these rooms through a separate stand-alone system. Environmental limits are specified in 569-A and shall be respected. The electrical cooling load will be up to 700 Watts per square metre in the Entrance Room or the portion of the MT/ER used as an Entrance Room if the Entrance Room forms part of the MT/ER. The electrical cooling load in the MT/ER (or the portion of the MT/ER not used as an Entrance Room if the Entrance Room forms part of the MT/ER) will be up to 100 watts per square metre. Actual cooling loads may be much less and the system must be designed to be adaptable to actual cooling loads. Continuous 7/24/365 air changes shall also be provided as specified in 569-A. Provide outside air for ventilation, as required by code, for occupied spaces.
A separate supply circuit serving these rooms shall be provided and terminated in its own electrical panel within the room. If the building is equipped with an emergency generator, the panels shall be served from the building's (lessor's) emergency generator and automatic switchover shall be provided. The panel in each room shall be sufficient to handle the cooling loads specified above and no less than 100 amperes. If the Entrance Room is combined with the MT/ER, a separate panel (minimum 100 amperes each) shall be provided in each portion of the combined room.
The Entrance Room and MT/ER shall be designed to accept delivery of large heavy equipment. They shall be served by a suitable freight elevator. See Annex B.4 of 569-A.
In the MT/ER, plywood shall be mounted on a wall as specified in Clause 220.127.116.11.3 and Table 8.3-1 of 569-A. For buildings having a gross floor area in excess of 10,000 square metres, the amount of plywood shall be increased in direct proportion to the requirement specified for 10,000 square metres. Additional wall-mounted plywood shall be provided in the Entrance Room or the portion of the MT/ER functioning as an Entrance Room, as specified in Clause 18.104.22.168 of 569-A. The location of the plywood shall be coordinated with PWGSC/PSPC.
Convenience duplex outlets shall be placed at 4 m intervals around the perimeter walls, at a height of 450 mm above the floor.
Provide and install a telecommunications cable tray at ceiling height around the entire perimeter of the MT/ER. The cable tray shall be of the center-spine or ladder type type with no more than 150 mm between rungs. It shall have minimum dimensions of 305 mm wide by 103 mm deep. If necessary, extend this cable tray as required so that it will be directly below all telecommunications pathways entering the MT/ER. Coordinate the location with PWGSC/PSPC.
In addition to the requirement specified in Clause 22.214.171.124 and 126.96.36.199 of 569-A, the floor of the MT/ER and entrance room shall be covered with a coat of suitable paint. The paint shall be light in colour.
2.3 Telecommunications Rooms
Provide on each floor at least one telecommunications room (TR) to 569-A. No telecommunications room may serve more than 1000 square metres of floor space.
2.3.2 Size of telecon room based on floor area served
Room sizing shall be:
This table stipulates the size of telecon room based on the floor area served.
|Serving Area||Room Size|
|1000 sq. m||3 m x 3,4 m|
|800 sq. m||3 m x 2,8 m|
|500 sq. m||3 m x 2,2 m|
Where more than one room is required on a floor, rooms shall not be adjacent to each other or share any common walls. Each room shall be located as close as practicable to the center of the area it serves and preferably in the core area. See 569-A, Figure 7.2-1.
Multiple rooms on a floor shall be linked by a pathway, as required by Clause 188.8.131.52.
A minimum of two dedicated 120 volt nominal, non-switched, ac duplex electrical outlet receptacles, each on a separate branch circuit, shall be provided for equipment power. These receptacles shall be rated at 20 A and be connected to a 20 A branch circuit. In addition, identified and marked convenience duplex outlets shall be placed at 1.8 m intervals around the perimeter walls, at a height of 450 mm above the floor. For the equipment receptacles, automatic switchover of power to the building's (lessor's) emergency generator shall be provided, if there is a generator in the building. Locations of receptacles shall be coordinated with PWGSC/PSPC.
Continuous 7/24/365 cooling shall be provided in these rooms through a separate stand-alone system. HVAC equipment shall provide environmental conditions specified in 569-A for Equipment Rooms. The electrical cooling load in each telecommunications room is 3 kW. Continuous 7/24/365 air changes shall also be provided as specified in 569-A. Provide outside air for ventilation as required by code for occupied spaces.
In addition to the requirement specified in Clause 184.108.40.206 of 569-A, the floor of each telecommunications room shall be covered with a coat of suitable paint. The paint shall be light in colour.
As an exception to Section 1.1.3 above, the word "should" is not replaced by the word "shall" in Clause 220.127.116.11 of 569-A. To facilitate cable pulling, sleeves and slots should be adjacent to the door, as shown in figure 7.2-2.
Provide and install a telecommunications cable tray at ceiling height around the entire perimeter of each telecommunications room. The cable tray shall be of the center-spine or ladder type with no more than 150 mm between rungs. It shall have minimum dimensions of 305 mm wide by 103 mm deep. If necessary, extend this cable tray as required so that it will be directly below all telecommunications pathways entering the telecommunications room. Coordinate the location with PWGSC/PSPC.
3. Horizontal Telecommunications Raceway System
From each telecommunications room (TR), provide a zone conduit (EMT or rigid conduit) system designed to meet the requirements of 569-A. Individual conduits shall be run below the ceiling slab from the TR to the centre of each zone (typically the area between 4 adjacent building columns). Zone size shall not exceed 82 square metres. Reference Clause 18.104.22.168 of 569-A.
3.2 Size of EMT based on size of zone served
Conduit (EMT or rigid conduit) size shall be no less than:
This table stipulates the size of the conduit based on the size of zone served.
|Zone Area||Conduit Trade Size|
|35 sq. m. or less||41|
|35 1 sq. m. to 50 sq. m.||53|
|50 1 sq. m. to 82 sq. m.||2 runs 53|
As an alternative to this below-the-slab zone conduit system, a similarly sized in-slab system using rigid conduit, EMT, or non-metallic electrical tubing may be used.
As an alternative to the zone conduit system specified in 3.1 above, a suitable cable tray system may be provided from each TR. It shall be designed to meet the requirements of 569-A. The cable tray shall be of the center-spine or ladder type with no more than 150 mm between rungs. Conduits sized as specified in Section 3.2 above shall be run off the tray to the center of each zone when the tray does not pass through the centre of a zone.
4. Backbone Telecommunications Raceway System
If there is a separate entrance room, provide trade size 103 conduits (EMT or rigid conduit) from the entrance room to the main terminal / equipment room (MT/ER). Conduits or tray shall meet the requirements of 569-A. If conduits are used, provide one conduit for every 5,000 square metres of floor space in the building plus 2 spare for a minimum of 3. As an alternative, a cable tray having a similar capacity may be used, provided it is permitted by code and that it is run only through open accessible areas.
Unless the MT/ER is located directly under the TR, provide a cable tray or Trade Size 103 conduits linking MT/ER to the TR or TR stacks. The quantity of Trade Size 103 conduits serving the TR or TR stacks shall be one for every 5,000 square metres served by the backbone system plus 2 spare for a minimum of 3. The cable tray shall be of similar capacity, if used.
If TRs are stacked vertically, provide 103 mm sleeves between TRs. As required by 569-A, the quantity of conduits or sleeves shall be one for every 5,000 square metres served by the backbone system plus 2 spare for a minimum of 3.
Trade Size 103 conduits (EMT or rigid conduit) shall be used for any jogs where the TRs are not stacked vertically. The quantity of conduits shall be as specified above in 4.3.
5. Service Entrance Pathway
Communications cables shall enter the building in ducts. Design guidelines for facilities associated with each type are found in 569-A and shall be followed.
More than one point of entry should be considered to permit redundancy, such as providing entry for cables from different streets.
Unless served by a tunnel, the size of the entry ducts at each point of entry shall be 103 trade size. At least 3 ducts shall be provided for buildings having a total floor area of up to 5,000 square metres and one additional duct shall be provided for each additional 10,000 square metres of floor space or part thereof.
A conduit (EMT or rigid conduit) of the same size and quantity as the entry ducts shall be run from each point of entry to the telecommunications entrance room.
Wireless carriers typically require a roof-mounted antenna to provide services. Coordinate the antenna mounting requirements with known wireless service providers. Provide a Trade Size 53 conduit (EMT or rigid conduit) linking the building penetration to a telecommunications room located on the top floor. Cables of the wireless provider may then be run through this conduit, through spare backbone pathways, through the main equipment room and to the entrance room.
6. Telecommunications Grounding and Bonding System
A generic telecommunications grounding and bonding system is shown in Figure 2.1-1 of 607-A.
Install the Telecommunications Main Grounding Busbar (TMGB) to 607-A. It shall be installed in the entrance room on insulated supports 50 mm high at a location close to the electrical power panel.
Install a Telecommunications Grounding Busbar (TGB) in the MT/ER to 607-A. It shall be installed on insulated supports 50 mm high at a location close to the electrical power panel. Install a TGB (to 607-A) in each telecommunications room on insulated supports 50 mm high and at a location close to the electrical power panel, if there is one in the telecommunications room.
As an exception to Section 1.1.3 above, the word "should" is not replaced by the word "shall" in Clause 5.1.4 of 607-A. Grounding and bonding conductors should not be placed in a ferrous metallic conduit or EMT. "If it is necessary to place grounding or bonding conductors in a ferrous metallic conduit or EMT that exceeds 1 m in length, the conductors shall be bonded to each end of the conduit or EMT using a grounding bushing and a No. 6 AWG conductor, minimum."
Provide the bonding conductor for telecommunications from the TMGB to the service equipment (power) ground, to 607-A.
Provide Telecommunications Bonding Backbones [TBBs] from the TMGB to each TGB, to 607-A.
In a multi-storey building, provide a Grounding Equalizer (GE) between TBBs by bonding TGBs with a GE on the top floor and a minimum of every third floor in between the top and bottom floors, to 607-A.
Bond metallic raceways in the telecommunications entrance room (or the portion of the MT/ER used as an entrance room) to TMGB using a copper conductor, to 607-A.
Bond metallic raceways in telecommunications rooms, and the MT/ER to the TGB in each room, using a copper conductor, to 607-A.
Apply warning labels to all telecommunications bonding and grounding conductors, to 607-A.
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