CT PT load box Please use an appropriate power cord for this product. Only the power cord dedicated to the machine or a suitable gauge can be used. Connect and disconnect properly. Please do not connect or disconnect the test lead if it is connected to the charging terminal. Ground the machine. The grounding pole of the machine enclosure must be grounded, unless the product is grounded through the power ground wire. To avoid electric shock, the grounding conductor must be connected to the ground. Before connecting the input or output terminals, make sure that the machine is properly grounded.