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Avoiding accidents and blackouts

This book is a guide to the protection regulations for extra-high-voltage (EHV) overhead lines and underground cables for contractors, consultants, strategic partners, as well as anyone who is working on or near DEWA’s electricity transmission network.

Handbook on EHV overhead lines and underground cables
Handbook on EHV overhead lines and underground cables

It provides the necessary information to ensure that their projects conform to these regulations and what information, documents and other criteria must be provided to ensure their successful completion.

How this book will help you?

To avoid accidents and potential blackouts, and minimize risk. You can know what to do and what is required to ensure your work can be carried out in complete safety.

Transmission lines and equipment

Types of Cables

There are two voltages for underground cable – 400kV and 132kV. Currently, DEWA uses XLPE cables (Figure a and b), and also uses oil-filled cables (Figure c) in some areas.

Please note that power cables cannot be detected by cable detectors when shutdown or out of service.

  1. 400kV XLPE Cable
  2. 132kV XLPE Cable
  3. 132kV Oil Filled Cable
Transmission cable types
Transmission cable types

There are two types of communication cables:

  1. Fiber-optic cable
  2. Pilot cable

Note that Fiber-optic and Pilot cables cannot be detected by cable detectors, even when live.

Transmission communication cable types
Transmission communication cable types

Cable Equipment

Cable Joints

Cable joints are integral parts of the Transmission underground lines system as a whole. Note that a joint is a sensitive point in transmission cable systems. The joint area to be maintained and protected properly to ensure reliability of power supply.

A power cable joint is normally enclosed in 2.4 metre wide concrete troughs. A few joints are enclosed in troughs, with some access from manholes.

Joint locations are identified with red and white route markers for all types of installation.

Title:Handbook on EHV overhead lines and underground cables – Transmission Maintenance department; Power division; Dubai Electricity and Water Authority
Size:4.8 MB
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Handbook on EHV overhead lines and underground cables
Handbook on EHV overhead lines and underground cables

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  1. Ali Salman
    Jun 28, 2020

    Thanks for you’re sharing.

  2. Rejaneesh
    Jun 06, 2019

    This content is taken from DEWA hand book available in Google it is familiar isn’t it right.

    • Edvard
      Jun 06, 2019

      You are right, this is DEWA (Dubai Electricity and Water Authority) guide as is it is stated below. This guide and every other guide at EEP can be found by searching Google :)

  3. kata yamuna
    Jun 06, 2019

    nice concept but it is difficult because already transmission lines are there but why you want underground.

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