Bus Bar Shroud with IP2X Protection and Creepage Distance
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Solution Overview
Problem
Existing electrical equipment lacks a means to effectively create a fault-free zone between circuit breakers and bus bars, compromising safety for personnel by not preventing electrical shock and not allowing easy connection of various branch circuit breakers.
Innovation Solution
A bus bar arrangement with a shroud made from Nylon 6,6, featuring recesses and beveled portions that enclose bus bars, providing a fault-free interface and increased creepage distance, allowing easy connection of circuit breaker contacts while preventing access to live connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If circuit breakers are connected directly to bus bars, then connection simplicity is improved, but safety is worsened due to risk of electrical shock from exposed live connections
Solution Approach 1:
The shroud acts as an intermediary component between the bus bar and the external environment. It encloses the bus bar while incorporating a connection surface that allows circuit breaker contacts to connect to the bus bar through the shroud structure, thereby maintaining electrical connection functionality while preventing direct access to live parts and achieving IP2X protection.
Solution Approach 2:
The shroud functions as a protective shell that encloses the bus bar. This shell structure provides physical barriers to prevent objects larger than 12 mm from accessing live connections, while still allowing necessary electrical connections to be made through its designed interface.
2Object-affected harmful factors
If additional insulation is added to protect bus bars, then safety is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The protective function and the connection function are merged into a single integrated shroud component. The shroud simultaneously provides enclosure for safety, connection surface for electrical connectivity, and structural support, eliminating the need for separate insulation layers, barriers, or additional protective components.
Solution Approach 2:
The shroud serves multiple functions: it acts as a protective enclosure for safety, provides a connection surface for circuit breaker attachment, maintains IP2X rating, and supports the bus bar structure. This multi-functionality reduces overall device complexity compared to using multiple separate components for each function.
3Manufacturing precision
If bus bar design is standardized, then manufacturing precision is improved, but adaptability to various circuit breaker types is worsened
Solution Approach 1:
The connection interface is segmented into a standardized bus bar portion (for manufacturing precision) and a flexible shroud portion (for adaptability). The shroud can be configured with different connection surface geometries to accommodate various circuit breaker contact types while the bus bar itself maintains standardized dimensions for precise manufacturing.
Solution Approach 2:
The shroud provides dynamic adaptability to different circuit breaker configurations while the bus bar maintains static standardization. The connection surface on the shroud can be designed to accommodate various contact geometries, allowing the same standardized bus bar to work with different circuit breaker types through the adaptive shroud interface.
Data Source
AI summary
A bus bar arrangement for electrical equipment has at least one bus bar and a shroud. The shroud provides a fault free interface for personnel working with the electrical equipment. First and second shrouds mounted on opposing ends of the at least one bus bar surround a substantial portion of the at least one bus bar. The shroud provides a connection surface for the connection of a wide variety of circuit breakers thereon. The shroud provides protection against intruding objects and ease of connection between circuit breaker contacts and bus bar assemblies of electrical equipment.