After the installation of the electricity meter box, how long it needs to be tested before it can be used mainly depends on the installation process and regulations of the power department. Generally speaking, electricity cannot be used immediately after the installation of the meter box. According to the standard procedure, the power department will conduct a series of inspections and tests to ensure that the meter box and its connected meters and other equipment are operating normally and the data is accurate and error free.

The testing time is usually completed within 1-3 working days, but may vary depending on the region, the efficiency of the power department, and the specific installation situation. During this period, the power department will carry out tasks such as confirming meter readings, uploading data, and system debugging to ensure that the meter box can accurately measure and transmit electricity usage data.

Therefore, it is recommended that users patiently wait for testing and confirmation from the power department after the installation of the meter box, to avoid using electricity without acceptance, and to avoid unnecessary trouble or safety hazards. At the same time, users can also consult the local power department for specific testing time and procedures, in order to better arrange their electricity consumption plan.