Work under power lines

Arcing or contact by plant or vehicles Contact by long metal objects Contact with workers 

British Standard BS7121 Code of Practice — Safe use of cranes 

Pre-contract liaison must be undertaken with the local electricity utility to agree diversions or safe clearance distances, and any other steps needed. Work which will require plant to be in the vicinity of lines must be identified, preferably within the pre-construction safety plan. 

Movementsof visiting vehicles and plant must be controlled. Barriers and warning signs must be continuously monitored to ensure that they remain intact and in place. All crane operations and crane movements in the vicinity of overhead lines must be supervised continuously. A permit-to-work system may be required for some tasks beneath lines. Written instructions should be issued for briefing drivers of visiting vehicles on the hazards. 

Operatives and subcontractors must be briefed on the specific site hazards and the requirements of GS6. Drivers of visiting vehicles affected must be briefed on the hazards and the crossing points. 

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An ice storm, windstorm, tornado, forest fire, or flood may bring down power lines by the hundreds. Under those circumstances electric companies customarily borrow skilled professionals from one another to augment their own work forces. First Responders have their own jobs to perform at such times, usually as part of a task force. 

Electrical hazards are covered in detail in Chapter 14, and all the control measures mentioned apply on a construction site. However, due to the possibility of wet conditions, it is recommended that only 110 V equipment is used on site. If mains electricity is used (perhaps during the final fitting out of the building), residual current devices should be used with all electrical equipment. Where workers or tall vehicles are working near or under overhead power lines, either the power should be turned off or goal posts or taped markers used to prevent contact with the lines. Similarly, underground supply lines should be located and marked before digging takes place. 

Work near or under overhead power lines... 

A furnace is a device (enclosure) for generating controlled heat with the objective of performing work. In fossil-fuel furnaces, the work appHcation may be direct (eg, rotary kilns) or indirect (eg, plants for electric power generation). The furnace chamber is either cooled (waterwaH enclosure) or not cooled (refractory lining). In this article, furnaces related to metallurgy such as blast furnaces ate excluded because they ate coveted under associated topics (see... 

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