Rolled Rail Neutral Bus Bar for Mixed Circuit Breaker Wiring
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Solution Overview
Problem
The increased use of arc-fault and ground-fault circuit breakers in electrical distribution panels leads to clutter and wiring difficulties due to the need for separate connections for pigtail and plug-on-neutral circuit breakers, resulting in a crowded and complex wiring environment.
Innovation Solution
A rolled rail neutral bus bar system that securely mounts all types of circuit breakers and includes wire-capture apparatuses along its edge for convenient connection, eliminating the need for separate pieces and reducing clutter by allowing neutral connections to be made at any location along the rail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate neutral connection bars are used for pigtail and plug-on-neutral circuit breakers, then both types of circuit breakers can be accommodated, but the device complexity and material usage increase
Solution Approach 1:
The patent combines the functions of separate neutral connection bars into a single integrated neutral bus bar. The rolled rail structure provides both plug-on-neutral connections directly on the rail and wire-capture apparatuses for pigtail connections along its edge, eliminating the need for separate neutral connection components while maintaining compatibility with both circuit breaker types.
Solution Approach 2:
The neutral bus bar is designed as a universal component that serves multiple functions: it provides plug-on-neutral connections through the rolled rail for plug-on-neutral circuit breakers, and provides wire-capture apparatuses for pigtail connections for pigtail-neutral circuit breakers. This multi-functional design allows a single component to accommodate both types of circuit breakers.
2Adaptability or versatility
If neutral connection bar extends down the side of the distribution panel, then pigtail circuit breakers can be connected, but additional material is used and panel size increases
Solution Approach 1:
The patent merges the side-extending neutral connection bar function into the main neutral bus bar structure. The wire-capture apparatuses are integrated along the edge of the neutral bus bar itself, eliminating the need for a separate side-extending neutral connection bar and reducing overall material usage.
3Device complexity
If all wire connections to line-side neutral are made in a small area, then neutral connections are centralized, but wiring difficulty and clutter increase
Solution Approach 1:
The patent distributes wire connections along the length of the neutral bus bar in the wire gutter, rather than concentrating them in a single small area. The wire-capture apparatuses are spaced along the edge of the neutral bus bar, allowing wire connections to be made at multiple locations along the rail, reducing clutter and improving ease of wiring operations.
Data Source
AI summary
A loadcenter is equipped with a unitary neutral bus bar capable of receiving AFI and GFI circuit breakers having either a plug-on-neutral connection or a wire-neutral connection. The neutral bus bar is connected to line neutral and has a rolled rail that is formed by rolling an end of a conductive plate and bending the plate at a transition portion to position the rolled rail above and at an angle of a major flat surface of an extension of the neutral bus bar. Wire-capture apparatuses secured along an edge of an extension of the neutral bus bar can capture wires from circuit breakers that lack an internal connection to a neutral plug-on mounting jaw or that lack a neutral plug-on mounting jaw altogether.