Finding out more: Safety clearance distances

There are safety clearance distances to all overhead lines to ensure that no flashover occurs.  The basic standards are set in Regulations (see schedule 2) then a Standard gives more detail on specific situations.  The details can be found on the National Grid website (see Appendic III on page 23 and following).

Pylons have warning notices to warn of the risks if the live conductors are approached too closely.