B72530T600K62
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the distance between two baselines of lines of type. The word 'leading' originates from the strips of lead hand-typesetters used to use to space out lines of text evenly. The word leading has stuck, but essentially it's a typographer's term for line spacing.
The voltage tolerance level for the electrical auxiliaries is defined by the standard. The maximum and minimum nominal voltages are defined by the tolerance level.