The column frame is composed of
Main Disconnect Box: Must provide simultaneous disconnection for all captive conductors;
– Busbar Box: Should establish the interconnection between the disconnect switch box and the output protection boxes;
- Output Protection Box: Equipped with NH bases, disconnectors 22×58 or 14×51.
The enclosures for the column frames are metallic; however, after electrification, they have insulation equivalent to class II, ensuring that:
- Bare live parts (such as, for example, uninsulated busbars and connection terminals) are separated from all conducting parts by a distance of not less than 20 mm;
- Transparent polycarbonate cover on the busbar box and output protection box.
The centralization of electric energy meters comes to the market with the clear objective of:
- Improving the quality of electrical installations;
- Facilitating the work of the installer;
- Reducing material waste on-site, thereby contributing to a better environment;
- Facilitating the reading of energy consumption by the distributor;
- Facilitating possible individual power increases, as each fraction has a direct feed to the centralization.
The centralization of counting is carried out with class II enclosures with a transparent cover, allowing easy reading, control of counting equipment, and other elements. The covers are fixed with screws and can be sealed if necessary. The busbar box can accommodate the busbar and fuses, or separate boxes can be used for the busbar and the fuses.
The counting centralization is dimensioned (with space) for three-phase inputs and for three-phase counting equipment, even if the installation is designed for single-phase, allowing for the future transition from a single-phase to a three-phase input.