Appendix III Safety Clearances
It is important to note that the information in table 1, giving the minimum safety clearances is for illustrative purposes only. The necessary clearance at a specific location will be dependent on factors including the location the line is passing over, the line’s construction, design, and its operating voltage. It is therefore important to contact National Grid where it is intended to construct or alter the ground levels within the vicinity of a National Grid overhead line so that detailed advice on safety clearances and other relevant information may be given. In order to ensure that safety clearances are not infringed where works are planned near to overhead lines, National Grid can provide profiles of the overhead line crossing specific sites which detail the height above ground of the lowest conductor. Line profiles are drawn at the time of construction to illustrate the position of the conductors at maximum sag. The position of the conductors at maximum swing should also be taken into account.
Developments adjacent to overhead lines should be designed to facilitate their construction without infringing electrical safety clearances. Care should be taken when unloading, stacking or moving material under conductors. Those involved should be acquainted with the Health and Safety Executive Guidance Notes GS6(rev) and HSG47 which advises on the avoidance of danger from overhead electrical lines and underground services respectively.
References
a) The Electricity Safety, Quality and Continuity Regulations 2002 (S.I. 2002 No 2665).
b) Energy Networks Association - Technical Specification 43-8 Issue 3, 2004 - Overhead Line Clearances.
c) Health & Safety Executive Guidance Note GS6(rev) - Avoidance of danger from overhead electrical lines.
d) Health & Safety Executive Guidance Note HSG47 - Avoiding danger from underground services (Second edition).
Overhead Line Conductor Clearances
