15 to 20 ft. at point of greatest sag is the norm. utilities typically set poles of specified heights and distances to maintain the desired sag. attached is a chart showing minimum approach distances for energized equipment at different voltages. all voltages can/will arc through the air if a conducting object invades that air space, therefore minimum safe approach distances have been determined for the varying voltages. note, these are approach distances only and does not pertain to sagging of conductors. weather conditions can affect these distances and have been factored in.
Table 19-1A Column 1 Voltage Column 2 Minimum approach distance for working close to exposed electrical equipment or conductors Phase to phase Metres Feet Over 750 V to 75 kV 3 10 Over 75 kV to 250 kV 4.5 15 Over 250 kV to 550 kV 6 20 Purpose of guideline This guideline describes the application of Table 19-1A minimum approach these may vary somewhat from utility to utility. the presence of voltage produces a magnetic field and passing a conductor (extension cord) through that field can produce its own voltage of sufficient strength to cause injury. the higher the voltage the greater the risk. note also-this pertains to non-insulated conductors.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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