To maintain an adequate flashover distance between the end of the protector cuff and the end of the rubber glove cuff, the glove should be longer than the protector by at least one inch multiplied by the glove's class number.  However, the distance cannot be less than one half inch for class 00 and class 0 gloves.  The minimal recommended uncovered distance is 1 inch for each 10,000 volts.