Contact with overhead power lines (OHPLs) causes fatal or severe electric shock and burn injuries. This can also happen when a person or object is close enough to a line for a flashover to occur.
Striking underground cables often leads to burn injuries from the resulting explosion. It may also result in electric shock if contact is made with live conductors.
All overhead lines and other electrical apparatus can be extremely dangerous. If you need to work near them, get competent advice from the owner of the lines, usually the Network Operator (NO).
Working near live overhead electric lines and underground electric cables is responsible for many incidents every year. These incidents often result in the death of or serious injury to people, damage to equipment and disruption of electricity supplies. A number of these incidents are related to tree work near live electrical equipment.
When arboricultural (aerial and ground) works are proposed within 10m (measured at ground level horizontally from below the nearest wire) of overhead power lines a risk based approach needs to be adopted. In practice this means that you should seek specialist advice and guidance from the owner of the power line (Network Operator) before undertaking any work within this distance.
You must also consider:
When you need to work near OHPLs, you need to agree with the owner of the line, usually the network operator (NO) for the power lines to be disconnected.
Remember to consider the risks from, and to, all overhead and underground utilities not just electricity
The power line owner (Network Operator) should assist in establishing a safe system of work. This could include:
The first choice when managing the risks from electricity should be to undertake the works dead.
Any decision to undertake live works must be justified, documented and meet the criteria of the Electricity at Work Regulations Regulation 14
“No person shall be engaged in any work activity on or so near any live conductor (other than one suitably covered with insulating material so as to prevent danger) that danger may arise unless -
(a) it is unreasonable in all the circumstances for it to be dead; and
(b) it is reasonable in all the circumstances for him to be at work on or near it while it is live; and
(c) suitable precautions (including where necessary the provision of suitable protective equipment) are taken to prevent injury”
You can minimise the risk of injury associated with any task with a work plan based on:
To ensure that any tree work which has to be carried out near to live electrical equipment is done safely, only work:
For advice telephone the local Network Operator.
NB - In the case of conflicting published guidance regarding safety distances and working techniques the advice of the Network Operator should be sought for clarification before proceeding.