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Zones 

The Electricity (Hazards From Trees) Regulations 2003 state exactly how close trees may come to power lines before cutting or trimming is required. These measurements or Zones are known as the Growth Limit Zone and the Notice Zone.
 
The Growth Limit Zone is the space around the power line where trees must not encroach even in windy or stormy conditions. The Notice Zone is one metre beyond the Growth Limit Zone (Refer to Diagram).
 
 

  Growth limit zone 
Notice zone
Professional only zone

                       The tree in this illustration will need to be cut or 
                       trimmed because it is inside the growth limit zone.

 

 VOLTAGE GROWTH LIMIT ZONE
Distance in any direction from any point on the lines or equipment (d)
 33kV  2.5m
 11kV  1.6m
 400/230V  0.5m
These distances apply to power lines with spans between poles up to 150 metres. Additional clearances apply for spans greater than 150 metres. As a guide, most power lines on Centralines electricity network have spans up to 150 metres and are 33KV and 11kV but this will be confirmed in any notice from the network.

 

Note:

  1. The above distances are from power lines.
     
  2. Distances must be maintained under all conditions e.g. High wind.
     
  3. Low voltage is the power line between the house/building and Centralines transformer.