Its surface should consist of a layer of nominal 25 mm (1 inch) tongue-and-groove oak flooring (actual size 18 by 57 mm or 3/4 by 2-1/4 inch) mounted on two layers of nominal 19 mm (3/4 inch) plywood.
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% U4 y1 p( f* M! y9 b9 I2. Electrodes for hi-pot test
The electrodes, 6.4mm diameter for its cylindrical brass rods, with edges rounded to a 0.8mm radius
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The steel hemisphere 12.7 mm (1/2 in) in diameter
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