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Broadcast - Design Certification Update
Renewal and Refurbishment of existing timber crossarms
To prevent delays to construction of projects and unnecessary re-certification of projects the following advice is provided regarding the criteria for replacing existing timber crossarms.
Where the project has been certified and the requirement for the replacement of existing timber crossarms has been identified by the Level 3 ASP (and detailed within the construction plan), it is important that the Level 1 ASP identify this requirement on the construction plan and ensure that the appropriate materials and equipment are on site.
Timber termination and through strain crossarms are to be replaced with composite fibre crossarms wherever possible, timber pin crossarms are to be replaced with composite fibre crossarms where assessed as necessary (by the L3 ASP) or where the pin insulators must be replaced.
Additions to the document library
To assist with Level 3 ASP design submissions, files which were developed as part of the recent revision of CEOM7001 will be zipped and added to the external Document Library labelled 'Level 3 ASP Design Submission Files'.
The files consist of the symbology which contains many of the cells and line styles, a drawing checklist which relates to the construction drawing requirements, and the cell library files which are utilised with Essential Energy Micro-station preferences.
As Essential Energy uses Micro Station as our Distribution Design drawing package the cell library files being provided will only be in Micro Station format.
The drawing examples contained within CEOM7001 are also in the process of being finalised to be added to the document library but at this stage will only be provided in Micro-station format.
Increase in design temperature to 100 degrees and timeframe for compliance
Recent changes have been made to the overhead design manual CEOM7097 to increase the required design temperature from 90 degrees to 100 degrees.
In addition to the background already provided within the Construction News, the change to the design temperature has been made to effectively compensate for appropriate creep within design rather than in construction. Over tensioning conductors in the construction phase has been found to potentially over stress supporting structures and mis-interpretation of stringing charts.
The new requirement will enable creep temperature compensation to be utilised within the design phase and allow for a single design safety and creep compensation figure, this removes the need for conductors to be over tensioned at site to compensate for conductor creep.
The timeframe to implement the changes to design temperature should be incorporated as soon as practical into new design submissions. The final date for compliance with the new design temperature will be 30 March 2019.
Utilisation of cadastral data provided by Essential Energy
Producing construction plans requires the use of cadastral data, this can be obtained by request directly from Essential Energy’s website - https://www.essentialenergy.com.au/our-network/overhead-network-maps
When using cadastral data supplied either by Essential Energy or other source, it is important that this data is setup within the construction plan correctly to enable the information to be referenced back into Essential Energy’s GIS.
Setting the drawing up with the cadastral data in the correct spatial location should be done as part of every drawing creation and will greatly assist the asset closeout team, attached to this communication is an instruction sheet to assist and further explain the requirement. Instructions have been provided in both MicroStation and AutoCAD format.
What do you need to do?
- Review and download relevant documents located on Essential Energy's Document Library
- Communicate this information to relevant members of your organisation
Further Information
If you need further information, please email aspinfo@essentialenergy.com.au
