Split Protective Bushing for Post-Installation Wire Protection
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Solution Overview
Problem
The existing methods for preventing wire insulation damage at electrical connectors, as mandated by the National Electrical Code, require pre-installation of a protective bushing before wiring, which is often not complied with, leading to additional and dangerous work when corrections are made after installation.
Innovation Solution
A split protective bushing formed in two mating segments or a pivotably openable ring with interlocking snap closure, allowing assembly onto a connector after wires are already in place, featuring internal threads for engagement with the connector's external threads and an overlapping lip to protect the wires from the connector's edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective bushing is installed before wires are pulled through, then wire insulation is protected from damage, but installation complexity increases and compliance is not always achieved
Solution Approach 1:
The protective bushing is divided into two separate half-bushing segments that can be independently handled and installed. Each half-bushing can be slipped over the connector body separately, then joined together to form the complete protective ring, eliminating the need to install a complete bushing before wire installation.
Solution Approach 2:
The half-bushing segments incorporate movable joining mechanisms (such as spring-loaded latches or cam-locked joints) that allow the segments to be easily connected and disconnected. This dynamic joining system enables installers to assemble the complete bushing on-site after wires are in place, significantly improving installation flexibility.
2Reliability
If a protective bushing is installed after wires are attached, then compliance with National Electrical Code can be achieved, but wire disconnection and reconnection is required
Solution Approach 1:
By splitting the bushing into two installable segments that join together, the complete protective bushing can be assembled and installed after wires are already attached to the connector, eliminating the need to disconnect wires for compliance installation.
Solution Approach 2:
The half-bushing segments are pre-formed with joining mechanisms that allow for quick assembly. This preliminary preparation of the segmented structure enables rapid installation after wire attachment, minimizing correction time while ensuring code compliance.
3Ease of operation
If a protective bushing is cut to create an opening for wire installation, then installation without disconnection is possible, but the bushing structure is compromised
Solution Approach 1:
Instead of cutting a complete bushing (which compromises its circular strength), the bushing is manufactured as two separate half-segments. These segments maintain their structural integrity individually and when joined, form a complete protective ring without weak points from cutting.
Solution Approach 2:
The segmented design incorporates dynamic joining mechanisms that create a strong, interlocked connection between half-bushing segments. This mechanical joining restores and maintains the structural integrity of the complete bushing ring, equivalent to or stronger than an uncut bushing, while enabling post-installation assembly.
Data Source
AI summary
A split protective bushing is provided herein in two embodiments. According to the first embodiment, a first half ring is formed with dovetail protrusions on each end and a second half ring is formed with mating dovetail sockets on each end. Interlocking the dovetail protrusions and the dovetail sockets forms a circular bushing. According to the second embodiment, a first segment and a second segment are pivotally connected at one end of each. A second end of each segment has a tongue and latch respectively for being locked together to form a complete ring. Both embodiments include an internal thread and a lip for engaging a connector in an electric installation.