To set up a plastic electric box making line, you'll need several pieces of equipment and a workflow that includes:

1. Injection molding machine: This machine will melt and inject plastic into molds to create the components of the electric box.

2. Mold: A mold is needed to form the plastic into the desired shape of the electric box.

3. Conveyor belt: A conveyor belt system will move the molded plastic pieces to the next stage of the production line.

4. Assembly station: At the assembly station, workers will put together the various components of the electric box, such as the lid, base, and other parts.

5. Testing equipment: The electric box will need to be tested to ensure it is working correctly and is safe for use.

6. Packaging equipment: Finally, the finished electric box will need to be packaged for shipment.

the production line solution will involve a combination of machinery, people, and processes to create a high-quality plastic electric box efficiently. The specific details of the line solution will depend on the desired output and quality requirements.