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Overhead power lines range from 1kV for local distribution to 1,150 kV for ultra high voltage lines. These can produce electric fields up to 10kV/m on the ground directly underneath, but 50 m to 100 m away these levels return to approximately ambient. [20] Metal equipment must be maintained at a safe distance from energized high-voltage lines. [21]
The anticipate, recognize, evaluate, control, and confirm (ARECC) decision-making framework began as recognize, evaluate, and control.In 1994 then-president of the American Industrial Hygiene Association (AIHA) Harry Ettinger added the anticipate step to formally convey the duty and opportunity of the worker protection community to proactively apply its growing body of knowledge and experience ...
A worker may use a conducting wand during the approach to first make the connection. Once on the line, the worker is safe from shock as both the lineworker and the wire are at the same electric potential, and hence no current passes through their body. This is the same principle as that which allows birds to safely sit on power lines. [3]
"Contain [the hazards] at their source": Using administrative controls, screen for a given health hazard (in this case, TB). This can include source control, which can involve masking an infected patient. "Engineering controls": This usually involves configuring isolation rooms and HVAC systems to prevent the spread of infection.
The loss of muscle control is the reason that a person may be unable to release themselves from the electrical source; if this happens at a height as on a power line they can be thrown off. [5] [6] Larger currents can result in tissue damage and may trigger ventricular fibrillation or cardiac arrest. [7]
Corona discharges on the 380kV overhead power line over the Albula Pass (Switzerland) in foggy weather conditions (30 second long exposure) Coronas can generate audible and radio-frequency noise, particularly near electric power transmission lines. Therefore, power transmission equipment is designed to minimize the formation of corona discharge.
The leading safety hazards on construction sites include falls, being caught between objects, electrocutions, and being struck by objects. [23] These hazards have caused injuries and deaths on construction sites throughout the world. Failures in hazard identification are often due to limited or improper training and supervision of workers. [24]
These biological agents can cause adverse health effects in workers. Influenza is an example of a biological hazard which affects a broad population of workers. [14] Exposure to toxins generated by insects, spiders, snakes, scorpions, [15] [16] [17] etc., require physical