Tag Archives: ISODC

Lightning Protection designs

Quite some time ago, we had featured an article on the various lightning protection solutions that WAPP offers.

Did you know that WAPP also provides design and technical support for your lightning protection scope of works? We can assist with GA (General Arrangement) drawings as well as Detailed drawings. Additionally, we also offer any other design services (e.g. structural), training and advice for installations.

Here are some examples of the designs that we can offer.


Conventional System2000 Air Terminals compliant with AS1768


Dynasphere System3000 


ISODC system

Types of Lightning Protection Systems (LPS)

Lightning protection systems for buildings and installations may be divided into three principal types:

  1. LPS for Protection for buildings and installations against direct strike by lightning,
  2. LPS for Protection against overvoltage on incoming conductors and conductor systems,
  3. LPS for Protection against the electromagnetic pulse of the lightning.

Each system’s design requires:

  • The strike termination device must be positioned at the highest point on the structure.
  • The lightning protection system must be solidly and permanently grounded.
This type of Lightning Protection Systems can be divided into:LP3

Conventional lightning protection system (Also known as “Passive or Traditional)

  1. Franklin Rod LPS  A lightning rod, air terminal or a single mast will help prevent lightning from striking in the immediate vicinity. The lightning rod is a metallic capture tip placed at the top of the building. It is earthed by one or more conductors.
  2. The lightning rod with taut wires – These wires are stretched above the protectedLP4 structure. They are used to protect special structures: rocket launching areas, military applications and protection of high-voltage overhead lines
  3. Franklin/Faraday Cage LPS  This protection involves placing numerous down LP5conductors/tapes symmetrically all around the building. This type of lightning protection system is used for highly exposed buildings housing very sensitive installations such as computer rooms.



Non-Conventional lightning protection system – All ERITECH Isolated Downconductor system components meet the requirements of IEC 62305 series and appropriate products are tested in compliance with EN50164-1 and EN 50164-2.

  1. Dynasphere S3000 insulated system – The ERICO Dynasphere air terminal providesLP6optimal lightning capture to a preferred point for lightning discharges which would otherwise strike and damage an unprotected structure and/or its contents. Also known as an active system as it has a Dynamic response to the approach of a lightning down-leader
  2. ISODC Communications insulated system – The ERITECH isolated system providesLP7a traditional air terminal fitted to an isolated fiberglass reinforced plastic (FRP) mast. The isolated downconductor internally connects to the air terminal inside the FRP. The FRP mast has natural isolation properties, high strength for windy sites and low weight to minimize mast loading.



There are various lightning protection systems fit for purpose that can offer:

  • More cost effective in supply and installation
  • Less variables of installation and ease of application
  • Greater protection and performance
  • Minimal effects on visual and structure

West Australian Power Protection (WAPP) are the industry experts in Lightning, Surge and Grounding Protection.

WAPP will provide you direction for the best performance and most cost-effective solution that suits your project requirements.

Call us on (08) 9353 5300 or email wapp1@wapp.com.au for a FREE no obligation consultation and quote.

Protect Telecommunication Towers from Lightning Strikes

Communication Tower 2There is little argument that Lightning poses an enormous threat to telecommunication, radio and TV towers. These towers are constructed of steel and designed to be the highest structures in the surrounding area in order to supply communication with no interruptions.

There is a higher probability of Lightning hitting the sharpest and tallest object in an area. Furthermore, lightning current reaches the ground by following the shortest and most conductive way. That is why a telecommunication tower which is a tall metal structure becomes the primary target for lightning strikes.

When lightning strikes the top edge of a tower, the current flows downward to the ground and damages all electronic equipment like radomes, radios, antennas, dishes, cameras, etc… On the way to the ground, lightning current can leak and jump into nearby structures and shelters that result in permanent damage to sensitive electronic devices and equipment.

Lightning arresters endeavour to attract lightning in order to divert lightning energy to earth. There are a number of different scientifically proven solutions but typically they are installed on the highest points of the structure and connected to a downconductor cable which is bonded to a grounding system and then to earth. The purpose is to attract lightning before it reaches any other object and allow the lightning current to flow down to the ground and dissipate the energy through the earth.

The system at a telecommunications facility is divided into 5 components.

ERICO Telco Products-page-002

  1. Indoor Bonding Arrangement

Correct bonding for all lightning protection system elements is essential or the system will be totally ineffective against lightning strikes. Bonding of all metallic conductors assures everything is at equal potential, so if there is a strike you are protected.





  1. Outdoor Grounding LayoutERICO Telco Products-page-003

Low-resistance grounding provides an efficient destination for lightning current. Some soils are composed of sand or rock, that are highly resistant and not conductive. If surrounding soils are clays or dirt with moisture present, they likely are conductive There are local distributors that can provide the support and materials to ensure you achieve effective earthing and protection. 




ERICO Telco Products-page-005

  1. Surge Protection for Power Lines

Surge protection devices (SPDs) function either by absorbing the transient energy as heat or crowbarring the transient energy to ground (some in combination). They should be installed at main panel entries, at critical branch or secondary panels, and at plug-in outlets where low-voltage transformers convert AC power to DC current and voltage. SPDs should also be installed at signal and data line building entry points for critical electronic equipment.

  1. Surge Protection for Telephone Lines coaxial

Included here are Cat. 5/6, coaxial lines, and twin lead and other copper wire circuits. Telephone punch blocks should be SPD-protected. 


ERICO Telco Products-page-006

  1. Direct Strike Lightning Protection

Lightning usually terminates on grounded objects sticking up in the air. Franklin rods, Dynaspheres and ISODC are air terminals. Benjamin Franklin designs developed in 1752, divert lightning from rods in the air via conductors to rods in the ground, protecting important assets. This part of a lightning protection system (LPS) is based upon the principles of Path of Least Impedance.



Generally, there are two main systems of lightning protection:

  • Isolated Systems– These are commonly specified to protect metallic assets from potential lightning hazards. Partial discharges on bare conductors may form on the cable surface during immediate voltages, which can cause thermalization or breakdown. This can potentially adversely affect sensitive tower equipment.
  • Non-Isolated Systems – These are mostly recommended for communication towers as they contain the lightning energy and minimise the effects and interference to sensitive equipment caused by side flash.

IsoPH1621glated systems like ERICO’s (West Australian Power Protection) Isolated Downconductor (ISODC) and Dynasphere have a multi-layered insulation and semi-conductive outer sheath.

An isolated down conductor system provides the same materials and cross-sectional area as other IEC standards compliant down conductor with the benefit of having highly insulated coverings.

Commonly these isolated lightning protection systems are mounted on a tall support mast. An air terminal is mounted on the top of the mast, which provides required protection using the international IEC 62305 design standard.ISODC 1

The protection from lightning strike on radio, telecommunications and other towers sites can be protected using the right method and system.

West Australian Power Protection (WAPP) are the industry experts in Lightning, Surge and Grounding Protection.

We will provide you direction for the best performance and most cost-effective solution that suits your project requirements.

Call WAPP on (08) 9353 5300 or email wapp1@wapp.com.au for a FREE no obligation consultation and quote.