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13 January, 05:44

The expression 0.01E + 0.003E2 gives the thickness in millimeters (mm) of the insulation needed for a high voltage cable. E is the number of kilovolts carried by the cable. What thickness of insulation material is needed for 5 kilovolt cable?

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  1. 13 January, 06:04
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    The thickness is given by

    t = 0.01E + 0.003E² mm

    where

    E = kilovolts

    For a 5 kilovolt cable, set E to 5 to obtain

    t = 0.01*5 + 0.003*5²

    = 0.05 + 0.075

    = 0.125

    Answer: 0.125 mm
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