A sample piece of sheet of Insulating material of size 1270 x 1270 MM of thickness 3 MM is cut, which has 762 x 762 MM opening at the center. It is placed on the grounded metal plate. The opening is filled with conductive material so that it may come in contact with the same level of the sample piece to maintain direct contact with the mat. The mat is placed over the grounded electrode and wet pad of approximately the same size as the ground electrode is placed on top of the mat. The wet pad is energized with test voltage which is as per the chart above at “B” of Proof Voltage. The test is deemed to be successful if the specified voltage is reached. |