Recent and Current Work

Recent Completed Work

1. NZCCPTS representatives have been members of, and made major contributions on, the Standards Australia/Standards New Zealand Working Group that developed the Australian/New Zealand Standard 3835:2006 ‘Earth Potential Rise – Protection of telecommunications network users, personnel and plant’:

   Code of Practice	AS/NZS 3835.1:2006
   Application Guide	AS/NZS 3835.2:2006
   Worked Examples (handbook)	HB 219:2006

2. NZCCPTS representatives have been members of, and made major contributions on Power Coordination issues for, the EEA Working Group that developed the EEA ‘Guide to Power System Earthing Practice’ – June 2009.
3. The 2002 version of the NZCCPTS ‘Neutral Earthing Resistors or Reactors Application Guide’ was updated and renamed the ‘NZCCPTS Neutral Earthing Resistors or Reactors (including resonant earthing reactances) Application Guide’ in 2010, to include recent knowledge and progress in resonant earthing systems gained from the Orion installation of an 11 kV Petersen Coil at Darfield Substation.
4. The NZCCPTS ‘Power Coordination Application Guide for evaluating and addressing adverse interactions between Power and Telecommunication systems’ was published, and a PDF version made available for free download on the Publications webpage of this website, in September 2014. This guide provides a ‘big picture’ overview of Power Coordination, and ties together all the other more specific Power Coordination publications by providing cross-references to all the relevant NZ legislation, NZCCPTS Guides, AS/NZS standards, EEA standards and other relevant international standards, as well as filling in some of the gaps not covered by the other standards.

5. The NZCCPTS Earth Potential Rise Application Guide was published in 1989. It has subsequently been superseded by the below AS/NZS 3835:2006 ‘Earth Potential Rise – Protection of telecommunications network users, personnel and plant’ family of standards (which NZCCPTS made major contributions to):

   Code of Practice	AS/NZS 3835.1:2006
   Application Guide	AS/NZS 3835.2:2006
   Worked Examples (handbook)	HB 219:2006

   However, there were a few parts in the NZCCPTS Earth Potential Rise Application Guide (mainly in the Appendices) that are useful knowledge that is NOT covered in the above AS/NZS 3835 family of standards. To ensure this knowledge is not lost, it has been copied into a new NZCCPTS Earth Potential Rise Supplementary Handbook (January 2021). This new NZCCPTS document has been added to our Publications page, and can be downloaded free as a PDF document.

Current Work

Preparing New NZCCPTS Guides

1. Hazard Assessment Guide for the assessment of EPR and induced voltage hazard risk on telecommunication networks.
   • This Guide will discuss the acceptable means of complying with the Electricity (Safety) Regulation on Power Coordination. In particular, the following methods will be discussed:
     1. The use of Risk Evaluations – a case study or studies will be included in an Appendix.
     2. The use of the hazard voltage limits specified in the regulation as an acceptable means of compliance.
     3. The use of the hazard voltage limits in the ITU-T Directives Volume 6:2008 as an alternative means of compliance.
     4. The use of a new set of New Zealand hazard voltage limits as an alternative means of compliance. These New Zealand hazard voltage limits will be calculated from the body current curves in IEC/TS 60479-1:2005 using a similar methodology to that used in the ITU-T Directives Volume 6:2008, and in the EEA ‘Guide to Power System Earthing Practice’ 2009, but with parameter values chosen that are more appropriate for New Zealand.