Backbone Conduits System Installation

This article is about Backbone Conduits System Installation of Building Telecom Distribution System as per International Codes and standards.

Backbone Conduits System Installation | Telecom System

Backbone Conduits System Installation

Verify that ceiling tiles are removable when installation of conduits for backbone system is planned.
Verify that conduits junction points are installed where they are fully accessible from floor area below and safe for cable installations and changes.
Verify that the height of ceiling tiles are no greater than 3.4 m (11 ft) above the finished floor when installation of conduits for ceiling distribution system is planned.
Verify that conduit runs contain no 90° condulets (also known as LB).
Verify that conduit runs contain no continuous sections longer than 30 m (100 ft).
For conduit runs that total more than 30 m (100 ft) in length, ensure that pull points or pull boxes are inserted so that no segment between points/boxes exceeds the 30 m (100 ft) limit.
Bushings shall be placed on the ends of metallic conduit to protect cable sheaths from damage.
Verify that conduit runs in the most direct route possible (usually parallel to building lines), with no more than two 90° bends between pull points or pull boxes.
Verify that conduit do not runs through areas in which flammable material may be stored or handled (Hazardous Classified Area).
Verify that conduit do not runs over or adjacent to:
– Boilers.
– Incinerators.
– Hot water lines.
– Steam lines.”
Verify that each conduit that enters a TC is terminated 10 cm (4 in.) above the finished floor.
Verify that each conduit that enters a TC is reamed or bushed and terminated as close as possible to the wall where the backboard is mounted (to minimize the cable route inside the closet).
Ensure that the radius of a conduit bend is at least 10 times the diameter of the conduit.
Verify if a conduit run requires more than two 90° bends, a pull box between sections with 2 bends or less is provided.
Verify if a conduit run requires a reverse bend (between 100° and 180°), a pull point or pull box is provided at each bend having an angle from 100° to 180°.
Verify that a minimum of 2-three inch conduits is provided when linking two telecommunication closets (TC) to each other. Larger conduits are to be provided when required by the service demands.
Verify that overhead conduits entries into the TC shall protrude into the closet a distance of 5 cm (2 in) at a minimum height of eight (8) feet.
Ensure that all conduits are:
• Clean, dry, and unobstructed.
• Capped for protection.
• Labeled for identification.”
Verify that ceiling conduits and cabling are suspended from or attached to the structural ceiling or walls with hardware or other installation aids specifically designed to support their weight.
Verify that the ceiling conduit runs have adequate support to withstand pulling the cables.
Verify that the ceiling conduit runs is located 15 cm (6 in.) to 30 cm (12 in.) above the top surface of the cable tray side rail.
Verify that the ceiling conduit runs have a minimum of 8 cm (3 in.) of clear vertical space from conduits, wires, and cables.
Verify that the ceiling conduit runs and cables are not resting directly on ceiling panels, framework (T-bars), vertical supports, or other components of the suspended ceiling.