SAES-T-628 PDF - Telecommunications Underground Cable - PDFYAR - Engineering Notes, Documents & Lectures

This article is about SAES-T-628 which is about Telecommunications Underground Cable and download SAES-T-628 PDF for telecommunication and electrical engineers, supervisors and project managers, telecom QCs, telecom QC Supervisors. This is saudi aramco standards of Telecommunication Engineering based on international codes and standards and useful for telecom and electronics engineering knowledge to get job as engineers, QC Supervisors and QC managers, Engineering managers and technicians.

SAES-T-628 PDF Download

SAES-T-628

download saes-t-628 pdf

Telecommunications Underground Cable

Design requirements for the installation of rodding ducts, placing pull line (rope), and underground cable in accordance with Saudi Aramco Engineering Standard SAES-T-624 are as follows:

4.1 Installation Rodding Ducts and Placing Pull Line (Rope) Underground Cable:

All fishline ropes placed for future use must be made of non-biodegradable materials.

4.1.1 Placing a Pull Line or Cable:

Before placing the pull line or cable in the main conduit, the ducts must be thoroughly cleaned.
Service laterals that are old or suspected of being cluttered with sand or debris must be thoroughly cleaned before placing the cable.

4.1.2 Mandrel Testing:

Existing conduits must be tested in both directions using an appropriate size mandrel before placing an underground cable.
The mandrel sizes for standard four-inch (ID) PVC conduits are specified as follows:

Ducts for proposed cables up to 69 mm must pass a standard 3-inch diameter mandrel (12″ long x 3″ diameter).
Ducts for proposed cables larger than 69 mm must pass a standard D mandrel (12″ long x 3-5/8″ diameter).
Conduits that fail the standard D mandrel test may be suitable for subduct installations if they pass the standard 3-inch diameter mandrel test and have no difficulties during installation due to narrow clearances or misaligned joints.

4.2 Underground Cable and Rubber Conduit Plugs – Installation and Removal:
4.2.1 Overview:

Conduit plugs in underground conduits protect cable vault interiors and other environments by sealing them, preventing the entry of gases, foreign materials, water, moisture, rodents, and insects.
There are two basic types of conduit plugs: blank conduit plugs and split conduit plugs.
All conduits entering manholes, central office buildings, cable vaults, and other enclosed areas must be sealed with appropriate plugs or sealants.
Conduit ends, including road crossings, pole risers, and between pedestals and/or cabinets, must be plugged or sealed to prevent the entry of sand or debris.

4.2.1.2 Conduits entering central offices, cable vaults, or other buildings must be sealed at all times, except when work is in progress. When work extends overnight, a plug must be installed in the conduit until work resumes.

All conduits entering manholes must be plugged or sealed in accordance with SAES-T-628.
Existing duct plugs that are not properly sealed are considered potential safety hazards. During work in existing manholes or buildings, all conduit seals and plugs must be inspected and brought up to the current Saudi Aramco Engineering Requirements.

4.2.1.3 After completing work in cable vaults, buildings, and manholes, re-examine all conduit seals and secure or replace those that have been weakened due to cable movement or have become defective due to construction work.

4.2.1.4 The appropriate type of conduit plug to use under specific conditions can be determined by referring to the provided table.

These design requirements ensure proper installation, testing, and sealing of rodding ducts, pull lines, and underground cables to maintain the integrity and functionality of the infrastructure while ensuring safety and compliance with Saudi Aramco Engineering Standards.

Conduit Plug Types Guidelines

Table 1 provides guidelines for selecting the appropriate conduit plug types based on different conditions:

Condition: Conduits entering Central Office (CO) cable vaults, Controlled Environmental Vaults (CEVs), and other buildings.
Seal With:

Blank conduit plugs for unoccupied vacant conduits.
Simplex conduit plugs for sealing a single copper cable or fiber optic cable.
Triplex or Quadplex plugs for sealing multiple cables or innerducts within a conduit.

Condition: Conduits for drop wire and small entrance cables to buildings at manholes (if it is impractical to seal the conduit in the building).
Seal With:

Split conduit plugs, simplex, triplex, or quadplex.

Condition: Ducts containing cable or innerduct that are terminated on poles or building walls.
Seal With:

Split conduit plugs.

Condition: Ducts terminating on poles or building walls that are for unoccupied riser conduit.
Seal With:

Blank duct plugs with Hex nuts.

Condition: Conduits entering or leaving manholes or pull boxes that contain electrical apparatus such as Pulse Code Modulation (PCM) carrier housings, etc.
Seal With:

Split conduit plugs for conduit containing cable.
Blank plugs for unoccupied duct/innerduct, etc.

Condition: Conduit not connected to the conduit system, such as steel pipe clips under structures, submarine pipe crossings, between poles to buildings, and similar constructions.
Seal With:

Split conduit plugs at both ends for occupied ducts with cable or innerduct.
Blank plugs at both ends for unoccupied ducts.

Note: Conduit plugs can also be used to seal riser conduits or other openings between cable vaults or building areas. Cable plugs can help support cables as they transit vertically between floors or horizontally between walks.

These guidelines provide specific plug types to be used in different scenarios to ensure proper sealing and protection of conduits and cables in various applications.

SAES-T-628 PDF - Telecommunications Underground Cable

fAQs about SAES-T-628 PDF Download

Q1: What materials should be used for fishline ropes placed for future use?

A: Fishline ropes placed for future use must be made of non-biodegradable materials to ensure their longevity and resistance to degradation.

Q2: Why is it necessary to clean the ducts before placing the pull line or cable?

A: Cleaning the ducts before installation is crucial to ensure a clear pathway for the pull line or cable. This helps prevent obstructions and ensures a smooth and efficient installation process.

Q3: How should service laterals be handled if they are suspected to be cluttered with sand or debris?

A: Service laterals that are old or suspected to be cluttered with sand or debris should be thoroughly cleaned before placing the cable. This ensures optimal performance and minimizes the risk of blockages or interruptions in the future.

Q4: What is mandrel testing, and why is it necessary?

A: Mandrel testing involves testing the existing conduits in both directions using an appropriate-sized mandrel. It is necessary to verify the suitability and integrity of the conduits before placing an underground cable. This ensures that the conduits meet the required specifications and can accommodate the cable properly.

Q5: What are the mandrel sizes specified for standard four-inch PVC conduits?

A: For standard four-inch PVC conduits, the following mandrel sizes are specified:
Ducts for proposed cables up to 69 mm must pass a standard 3-inch diameter mandrel (12″ long x 3″ diameter).
Ducts for proposed cables larger than 69 mm must pass a standard D mandrel (12″ long x 3-5/8″ diameter).

Q6: Can conduits that fail the standard D mandrel test still be used for installations?

A: Conduits that fail the standard D mandrel test may still be suitable for subduct installations if they pass the standard 3-inch diameter mandrel test and do not encounter any difficulties during installation due to narrow clearances or misaligned joints. Proper evaluation and consideration of the specific conditions are essential in determining their usability.

SAES-T-628 PDF – Telecommunications Underground Cable