Tap Off Box Movable Sheath for Busbar Safety
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Solution Overview
Problem
Traditional power distribution systems, particularly those using cable trays, are labor-intensive to install and reconfigure, and tap off boxes in busbar trunking systems face challenges in safe mechanical and electrical connections, posing risks of electrocution.
Innovation Solution
A tap off box design featuring a movable sheath that biases against the inlet contact to prevent electrical connection with the conducting bar, allowing safe disconnection and simplifying the design by eliminating movable cables, with the sheath's movement making or breaking connections between the conducting bar and electrical outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tap off box is mounted on a BTS with fixed electrical connections, then reliable power supply is achieved, but the risk of electrocution increases and safety is reduced
Solution Approach 1:
The patent applies the dynamics principle by introducing a movable sheath that can transition between positions to make or break electrical connections. The sheath is movable relative to the inlet contact, allowing the system to dynamically change its electrical state from connected to disconnected, thereby enabling safe isolation while maintaining reliable connection during operation
Solution Approach 2:
The sheath acts as an intermediary element between the inlet contact and the conducting bar. It mediates the electrical connection by being positioned to either allow current flow (when retracted) or block it (when extended), providing a controlled interface that ensures safety without compromising operational reliability
2Object-affected harmful factors
If the inlet contact is made movable to break connection, then safety is improved, but the design complexity and cable movement requirements increase
Solution Approach 1:
Instead of making the inlet contact movable (which would complicate the design), the patent inverts the approach by making the sheath movable. The sheath, rather than the contact itself, is the moving element that controls connection status. This inversion simplifies the inlet contact design while achieving the same safety function
Solution Approach 2:
The patent extracts the movement function from the inlet contact and places it in the sheath. By separating the movement capability from the contact element, the design simplifies the inlet contact structure and reduces the complexity of cable routing, as the sheath's movement is self-contained within the tap off box housing
3Object-affected harmful factors
If the sheath is extended outside the tap off box to break connection, then safety isolation is improved, but the compactness of the device is reduced
Solution Approach 1:
The sheath is nested within the tap off box housing when in the connected position (retracted). When safety isolation is needed, it extends outward from the housing. This nesting arrangement allows the sheath to provide effective electrical isolation when extended while maintaining a compact form factor when retracted, minimizing the overall volume requirement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances safety by reducing the risk of electrocution, simplifies the installation process, and ensures reliable and compact operation by localizing movement, thereby improving the safety and efficiency of power distribution systems.
Implementation Method 1
the inlet contact is biased towards electrical connection with the conducting bar
Implementation Method 2
the sheath acts against the inlet contact's bias when the sheath is in the first position to prevent electrical connection of the contact with the bar
Data Source
Figure 1
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AI summary
A tap off box (22) for use with a busbar trunking system (24) comprising at least one conducting bar (26), the tap off box (22) comprising: an inlet contact (34); a movable sheath (36) for the inlet contact (34); and an electrical outlet (50) in electrical communication with the inlet contact (34), wherein, when the tap off box (22) is in a mounted position on the busbar trunking system (24), movement of the sheath (36) to a first position breaks an electrical connection between a conducting bar (26) and the electrical outlet (50).