|
Cabling
Standards: Communications Conduits & Information
Outlets, Communications Pathways Specifications
Download
PDF Version Cabling Standards
Cabling Standards Section Links
Communications
Conduits & Information Outlets
The minimum conduit and outlet
specifications for District’s communication
cabling system are as follows:
- Communication Entrance Conduits: The
communication entrance conduit shall consist of at least two (2)
four inch (4")
conduits run from the nearest existing manhole or pull-box, to the
Service Entrance and Termination Room of the new facility.
- This run of conduit shall not contain more then two 90-degree bends
and be placed with a minimum of 1/4 inch per foot slope to allow proper
water drainage from the ducts.
- No run of conduit shall exceed 300 feet between pull-boxes or manholes.
- New manholes shall contain permanent ladders, pull rings, grounding
system, a sump pit, and a floor drainage system to drain water.
- New pull-boxes shall contain, pull rings, grounding system, a sump
pit, and a floor drainage system to drain water.
- Other Outdoor Communication Conduits: Conduit run
outdoors for other communication purposes shall be a minimum of one-inch
diameter, and be placed with a minimum of 1/4 inch per foot slope to
allow proper water drainage from the ducts.
- No run of conduit shall exceed 300 feet between pull points and contain
no more then two 90-degree bends.
- If pull-boxes are installed the conduits shall enter the pull-box
one foot above the bottom and the pull box shall have a means to drain
water from them.
- Service Entrance: The conduits entering from outside
of the building shall terminate 4 inches after they penetrate the outside
wall. Cable tray shall be installed from the penetration point to the
Service Entrance and Termination Room. A ground wire with buss bar
shall be installed at the location the cable enters the building.
- Voice and/or Data Connections: At least two Cat.
6 outlet boxes with a minimum of two Cat. 6 cables per box shall be
installed on opposite walls within every classroom. There shall be
two outlet boxes containing three Category 6 jacks in each office unless
otherwise designated by ITS. Boxes should be installed on opposite
walls.
- Conduit from Outlets: A one-inch conduit shall connect
the four jack Category 6 outlet box to the nearest cable tray or J-hook.
The conduit shall terminate within 4 inches of the nearest cable tray
or J-hook. The minimum size conduit run from the telecommunication
outlet to the nearest cable tray of J-hook shall be a one-inch EMT
conduit.
- Conference Rooms: One outlet box with four Category
6 jacks and the corresponding one-inch conduit shall be installed in
every conference room and be connected directly to the Telecommunication
Room on that floor as designated by ITS.
- Security & Fire Alarm Telecommunication
Conduits: Conduit
installed for Security and Fire Alarm shall be a 1” EMT conduit
and be a home run back to the Telecommunications Room and shall have
a pull box after every 180-degree change in direction or elevation
or every 150 feet.
- Conduit runs shall not exceed 295 feet in length.
- Provide pull boxes in readily accessible locations. The installation
of pull boxes in the conduit run shall be placed in line with the conduit
run such that wire or fiber-optic cable can be pulled through the pull
box without incurring damage to the cable. No turns or bends of the
conduit run are allowed with pull boxes.
- Public Telephones: Conduit
installed for payphones, emergency phones and elevator phones shall
be a ¾” EMT
conduit and be a home run back to the Telecommunications Room and shall
have a pull box after every 90 degree change in direction or elevation
or every 150 feet.
- Conduit runs shall not exceed 295 feet in length.
- Provide pull boxes in readily accessible locations. The installation
of pull boxes in the conduit run shall be placed in line with the conduit
run such that wire or fiber-optic cable can be pulled through the pull
box without incurring damage to the cable. No turns or bends of the
conduit run are allowed with pull boxes.
- Bending Restrictions: Minimum radius for bends shall
be 9-1/2 inches for 3/4-inch conduit, 10-1/2 inches for one inch conduit
and the equivalent of long radius factory bends for larger sizes. The
short radius bends of larger diameter conduit normally installed for
electrical installations is not sufficient for communication cabling.
Four (4) inch conduit installed for communication cabling shall have
a four foot radius bend.
- Labeling: The contractor is
expected to provide tags, straps, and adhesive labels. These tags,
straps, and adhesive labels must be of high quality that will endure
over time. Hand
written labels are not acceptable. The contractor is required
to provide labels for all station cable at ten inches of the termination
ends, using Brady type self-laminating cable markers or equal. Station
cables will be labeled on both ends with the wall plate numbers according
to the ITS labeling standards. Label all pull
and junction boxes consistent with ITS standards and naming conventions.
- Pull Cords: Provide a nylon pull cord in each empty
conduit with a 200 pound pulling tension.
- Fiber-optic Cabling: Conduit installation for communication
purposes shall be installed with the probability of fiber-optic cable
being installed in it and pulling tension and minimum bend radius being
critical factors for installing usable fiber-optic cable as well as
the Category 6 cable.
Communications Pathways
Specifications
The standards adopted by the District provide that a clear and accessible
pathway for horizontal telecommunications cabling be provided. These
pathways are located between the Telecommunications Rooms and the rooms/offices
containing the voice and/or data outlets. The Design Team consultants
shall prepare drawings and specifications that insure a clear and accessible
pathway for telecommunications wiring. Any pathway that is not accessible
or does not provide a clear and workable pathway will need to be removed
and reinstalled to provide a clear and accessible pathway.
There are several methods available for providing
a pathway for supporting telecommunications cables. The architectural
design of each building is unique and requires an analysis of which
method(s) are best suited for that building. J-Hooks are the
preferred method of providing a pathway. Cable trays may be used and
in many instances may be preferred. Each type is listed below.
- Cable Trays: The cable tray
size(s) will be determined during the design phase of the project.
The cable tray shall be installed in accordance with the applicable
electrical code. The cable tray is to be dedicated for use only by
ITS. No other cabling is to share the cable tray without the approval
of ITS. There are three manufacturers
recommended for cable trays as shown below, however, an equivalent
quality cable tray can be substituted:
- MONO-Systems, Inc., "MONO-Tray" system
- B-Line Systems Inc., "Cent-R-Rail" system
- Chatsworth, “Cable Runway system”
- J-Hooks: The model to use will be determined
by the number of cables in that pathway. No other cabling is to share
the J-Hooks with ITS. There are two manufacturers recommended for J-hooks,
however, an equivalent quality J-hook can be substituted:
- B-Line Systems, Inc.; Models BCH21, BCH32, and BCH64
- Erico Fastening Products, "CableCat" system;
Models Cat21 and Cat32
|
