Push-In Electrical Disconnect for Simultaneous Conductor Isolation
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Solution Overview
Problem
Existing disconnect solutions for electrical circuits, particularly in non-residential fluorescent light fixtures, fail to meet National Electrical Code (NEC) requirements for simultaneous disconnect of all conductors from the power supply without adding labor costs or requiring special tools, and are not suitable for solid wire.
Innovation Solution
An electrical disconnect using push-in connectors with male and female contacts, integrated push-in connector elements, and a retainer plate, allowing for easy connection and disconnection of wires without crimping, suitable for both solid and stranded wires, and designed to meet NEC code requirements without additional labor or tool costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pin and socket connectors are used to meet NEC requirements for simultaneous disconnect, then safety requirements are satisfied, but labor costs and connector costs increase due to required crimping
Solution Approach 1:
The push-in connector elements automatically grip and retain the conductor without requiring external crimping tools or additional fastening operations. The connector performs the connection function through its own spring-loaded mechanism, eliminating the need for separate crimping steps and reducing labor costs while maintaining reliable electrical connection
2Ease of operation
If traditional twist-on connectors are used for ballast replacement, then installation is simple, but simultaneous disconnect of all conductors cannot be ensured
Solution Approach 1:
The electrical disconnect device is segmented into multiple independent contact units, each with its own push-in connector element. This segmentation allows each conductor to be independently connected or disconnected through individual push-in actions, while the housing structure ensures that all contacts are simultaneously disconnected when the device is removed from the circuit
3Productivity
If insulated terminals are used for low cost connection, then installation cost is reduced, but simultaneous disconnect requirement is not met and solid wire compatibility is lost
Solution Approach 1:
The push-in connector element is designed with universal functionality to handle both solid and stranded conductors through the same connection mechanism. The spring-loaded contact and gripping surfaces are configured to accommodate different wire types and sizes, eliminating the need for separate connector types while maintaining code compliance and reducing overall installation cost
4Reliability
If crimping processes are required for connector installation, then reliable electrical connection is achieved, but special tools and additional labor time are needed
Solution Approach 1:
The traditional mechanical crimping system is replaced with a push-in insertion system that uses spring-loaded contact elements. Instead of requiring external crimping force applied through specialized tools, the connector uses internal spring pressure to create reliable electrical contact when the conductor is simply pushed into the connector element, eliminating the need for crimping tools while maintaining connection reliability
Data Source
AI summary
An electrical disconnect has first and second female contacts mounted in a power connector housing and first and second male contacts in a load connector housing. The male contacts each have a male blade contact finger. The female contacts each have a socket for removably receiving a male blade contact finger. At the rear ends of both the male and female contacts there are integrally formed push-in connector elements for receiving a conductor or wire. The disconnect is particularly suited for use in connecting power wires to a load device in a circuit, such as a fluorescent light ballast.