The three-phase meter box (split meter ready board) can only be installed and used after passing the inspection and being sealed with lead seal when it leaves the factory. If there is no lead seal or it has been stored for too long, the relevant department should be asked to recheck and seal it before it can be installed and used. The three-phase meter box (split meter ready board) shall be installed in a dry and ventilated place vertically and without inclination. The bottom plate for installing the meter shall be fixed on a solid and fire-resistant wall that is not easy to vibrate. The height of the meter shall be about 1.8m. Connect the wires according to the circuit diagram, tighten the connection screws, and fasten the connecting plate in a lower torsion box. The actual electric energy can only be obtained by multiplying the indication of the transformer connected ammeter by the transformation ratio. In the process of using the three-phase meter box (split meter ready board), the IC card held by the user cannot be exchanged. If it is lost, it should be purchased from the power supply department. In addition, during use, the user must insert the IC card into the card holder once, so as to send the data in the table back to the computer database.