36. From time to time access is required onto land to inspect, maintain and refurbish overhead lines and underground cables. National Grid’s rights of access to undertake such works are contained within the wayleave agreement or permanent easement with the landowner.

37. Overhead lines are inspected on a routine basis both by foot and helicopter. Climbing inspections of pylons also take place. Less frequently, overhead lines are refurbished; and conductors, insulators and associated fittings may be replaced, or pylons painted. Occasionally pylons and their foundations may also be refurbished.

38. For major refurbishment, such as replacing conductors, safety scaffolding may need to be erected over underlying properties, roads and other development. Certain maintenance techniques also involve the use of helicopters.

39. National Grid needs quick and easy access to carry out maintenance to its equipment, to ensure that it can be returned quickly to service and be available as part of the transmission system. Such access can be difficult to obtain without inconveniencing and disturbing occupiers and residents, particularly where development is in close proximity to overhead lines.

40. National Grid recognises that maintenance and refurbishment activities can cause disruption and adversely affect the general amenity of those occupying buildings beneath or adjacent to overhead lines and near to cable routes. Where possible, National Grid seeks to minimise the effects of such disruption. Developers should take into account the requirement of National Grid to maintain access to its equipment.