What is the difference between primary, secondary and tertiary
1. The first-level distribution box is relative to a certain building or factory, which is the first-level distribution box of the cable directly drawn from the substation or municipal power distribution station.
Technical note
This reference is intended for preliminary fiber optic splice closure research. Compatibility, splice capacity, sealing class, tray layout, protection sleeves, installation methods, test limits and applicable standards must be verified for the specific project.