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Section Hazard / risk Default risk level Default residual risk Default control measure

Approach distances for work performed by unauthorised persons: Approach distances are one way of separating people from hazards. The approach distance for each work zone will vary depending on the voltage of the overhead electric line and the level of authorisation of each person doing the work. As the risk increases a greater approach distance is required. There are three work zones shown in Figure above: ZONE C: NO GO ZONE WHERE ELECTRICITY SUPPLY AUTHORITY APPROVAL IS REQUIRED. Zone C is the no go zone around overhead electric lines and associated electrical equipment where no part of a person, material, crane, vehicle or mobile plant may enter while the electric lines and associated electrical equipment are energised, without written approval from the Electricity Supply Authority. This includes: All parts of a person, hand tools, equipment or other materials held by them, & Cranes, vehicles or mobile operating plant including the load, controlling ropes and other accessories associated with the plant. No go zones apply whenever work is done or plant like a tip truck, crane, elevating work platform or a concrete pumping truck is operating around energised overhead electric lines and associated electrical equipment and the risk cannot be eliminated. The area of a no-go zone may vary, but it will always exist. A no-go zone extends in all directions around the energised overhead electric lines and associated electrical equipment ??? not just sideways. No go zones should be established before work starts. ZONE B: AUTHORISED PERSONS Authorised persons are workers who have successfully completed a recognised training course in overhead line electrical hazards so are permitted to work in Zone B. Zone B applies to: Authorised persons, with a safety observer, performing work in the vicinity of overhead electric lines including plant, hand tools, equipment or other material held by them, and Cranes and their loads and mobile plant operated by an authorised person, with a safety observer, in the vicinity of overhead electric lines. Zone B approach distances are based on the results of a written risk assessment. You must develop a safe system of work for Zone B. It should be based on a risk assessment and consultation with the Electricity Supply Authority about the proposed works. It should also comply with each work condition imposed by the Electricity Supply Authority. ZONE A: UNAUTHORISED PERSONS Unauthorised workers can only work in Zone A. Unauthorised persons are workers who have not received training in overhead line electrical hazards and do not have sufficient training or experience to enable them to avoid the dangers from overhead electric lines and associated electrical equipment. Zone A applies to: Unauthorised persons performing work in the vicinity of overhead electric lines including plant, hand tools, equipment or other material held by them, and Cranes and their loads and mobile plant operated by an unauthorised person in the vicinity of overhead electric lines. Use a risk assessment to decide whether a safety observer is necessary. The safety observer should monitor work close to Zone B to ensure no workers, plant or equipment enters Zone B.

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