ElectroNet has conducted extensive earth testing across New Zealand, Australia, and the Pacific over the past three decades. Historically, a proportion (~30-40%) of earth testing in New Zealand was conducted using out-of-service overhead lines to inject test currents. However, due to network constraints, in recent years getting circuit outages has become increasingly difficult. This shift has prompted a transition toward alternative current injection routes at sites which are challenging.
Running out current injection and voltage traverse cables introduces logistical and operational challenges. One of the most significant is the need for landowner liaison and access permissions. Unlike overhead line injection testing, run-out circuits often traverse private property, requiring careful coordination with landowners to secure access and maintain a good relationship with the electricity distribution business (EDB). This process involves not only technical planning but also clear communication, documentation, and often negotiation to align testing schedules with landowner availability and preferences.
In parallel with this, testing routes that are in road corridors or berms must comply with increasingly stringent (and changing) traffic management requirements. In New Zealand there are over 70 roading authorities to potentially interact with, which can add additional layers of complexity to route selection and approval processes. These requirements vary regionally and can impact both timing and feasibility of testing.
This paper describes the journey experienced by ElectroNet in New Zealand relating to landowner engagement and traffic management. These items shape the approach to earth testing at each site, cable route selection and how we have approached regulatory requirements and stakeholder engagement.