Poles can be made out of either tubular steel or wood.
Minimum clearances
| Pole structure | Over farmland | Over roads | Over railways | Right of way |
|---|---|---|---|---|
| 138 kV single | 7.4 metres (m) | 8.1 m | 8.7 m | 20 m |
| 138 kV H-frame | 7.4 m | 8.1 m | 8.7 m | 30 m |
| 230 kV H-frame | 7.9 m | 8.6 m | 9.3 m | 40 m |
138 kV Tubular steel single pole Single circuit/single conductor Tangent structure (T67/001)
138 kV Tubular steel H-frame Single circuit/single conductor Tangent structure
230 kV Tubular steel H-frame Double circuit bundled conductor Tangent structure
