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Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy along large distances. It consists of one or more conductors (commonly multiples of three) suspended by towers or poles .
An overhead line or overhead wire is an electrical cable that is used to transmit electrical energy to electric locomotives, electric multiple units, trolleybuses or trams. The generic term used by the International Union of Railways for the technology is overhead line . [ 1 ]
Each was rated at 1,500 kW, and around 25 miles (40 km) of overhead 11,000 Volt transmission lines distributed the power around the construction site, to be transformed down to 440 Volts where the power was needed. Some 1.5 miles (2.4 km) of narrow gauge railway were constructed to link the Monessie work sites together.
Four heavy duty marine batteries are equipped, with a 12 volt 40 amp battery charger. There is a 120 volt 50 amp shore power cable as well. Also fitted are an engine compartment blower; oscillating fans in all cabins; and navigation lights, night vision lights, overhead, and bulkhead lights.
Bare-hand, or potential working involves placing the worker in direct electrical contact with an energized overhead line. The worker might work alongside the lines, from a platform that is suspended from them, or may sit or stand directly on the line itself. [3] In all cases, the worker's body is maintained at the same voltage as the line.