What information should be provided to the manufacturer when customizing a complete set of electricity meter boxes?

The customer only needs to tell the specification of the empty meter box, and then assemble the components by himself.

However, the complete set of electricity meter boxes can only be quoted for production after detailed information is provided. The following are some configurations: sectional area of wiring conductor, sectional area of PE wire, sectional area of control wire, ammeter, outgoing circuit breaker, incoming switch, branching terminal block, current transformer, zero line copper bar, grounding protection line copper bar, outgoing switch, miniature circuit breaker, surge protector, collector, etc.