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Cable Tap Box Circuit Technology and Structural Technical Elements of Cable Tap Boxes
Release time:
2025-12-16
The electrical wiring inside cable distribution boxes is critically important for distribution boxes installed in designated locations. Although the physical technical specifications of many distribution boxes within the same project may be identical, their internal electrical wiring configurations generally differ significantly. Indeed, the electrical wiring is the most crucial technical aspect of cable distribution boxes.
The electrical wiring inside cable distribution boxes is critically important for distribution boxes installed in designated locations. Although the structural and technical specifications of many distribution boxes within the same project may be identical, their internal electrical wiring configurations typically differ significantly. Indeed, the electrical wiring is the most crucial technical aspect of a cable distribution box. For standard distribution boxes, considerations include the number of incoming and outgoing circuits as well as whether or not they are equipped with surge arresters. In more advanced distribution boxes, some incorporate several load switches, others combine several load switches with multiple load-fuse units (such as ring main units), and still others feature switchgear connections—including even segmented main busbar systems equipped with bus tie switches. The number of incoming and outgoing circuits varies among these different types of distribution boxes, and so do the quantities of surge arresters and monitoring devices on both sides.
Technical elements of cable distribution box enclosures:
Regarding the enclosure of high-voltage cable distribution boxes, the main technical elements are as follows:
1. Voltage levels: Medium-voltage system cables are available in three voltage levels: 10 kV, 20 kV, and 35 kV.
2. Installation location: There are three types—outdoor, indoor, and underground. The installation location indicates the operating environment of the equipment.
3. Connector types. These include shielded and unshielded types. For shielded connectors, the outer surface is safe to touch by hand when the connector is energized; for unshielded connectors, the outer surface must not be touched when the connector is energized.
4. Incoming current rating: Refers to the maximum current for a single circuit. Currently, there are two ratings available: 630A and 200A.
5. The external shape of the enclosure. For standard tap boxes, there are three types: single-cover (side-by-side), double-cover (butt-joint), and coverless types; for high-end tap boxes, all are door-type enclosures.
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