Electrical Plug Connector Keying Features for Voltage Safety
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Solution Overview
Problem
Existing electrical wiring devices lack effective mechanisms to prevent electrical plug connector assemblies rated for one voltage from being inadvertently connected to devices rated for a different voltage, posing a safety risk.
Innovation Solution
Incorporation of keying features such as ribs and grooves in the plug connector assemblies and electrical wiring devices to ensure compatibility by preventing incompatible voltage ratings from being connected, using a connector housing with a body portion and a plug portion that includes keys and keyways to mate with corresponding features on the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If keying features are added to prevent incompatible voltage connections, then electrical safety is improved, but device complexity increases
Solution Approach 1:
The patent applies asymmetry by providing keys on the plug connector that correspond to specific keyways in the electrical device. The keys are positioned asymmetrically relative to the plug body, and the keyways are positioned asymmetrically in the device housing. This asymmetric arrangement ensures that only plug connectors with matching key positions can be physically connected to the device, preventing incompatible voltage connections while maintaining a relatively simple overall device structure.
2Adaptability or versatility
If keying features are incorporated into plug connector assemblies, then compatibility control is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the plug connector assembly into distinct functional components: the plug body, the keys (which may be separate elements or integrated into the plug housing), and the keyways in the device housing. This segmentation allows each component to be manufactured separately using standard molding or machining processes, then assembled together. The keys can be injected molded as separate pieces or integrated into the plug housing, and the keyways are formed during device housing manufacturing, thereby managing manufacturing complexity while achieving precise compatibility control.
Data Source
AI summary
The present disclosure provides exemplary embodiments of wiring device assemblies that include an electrical wiring device and electrical plug connector assembly which permits easy connection of electrical conductors to the electrical wiring device via the plug connector assembly. The wiring device assemblies are configured to operate at a common voltage rating and include keying features to ensure the electrical wiring devices are configured to mate with electrical plug connector assemblies rated for the same voltage. The keying features include a key and corresponding keyway used to prevent electrical plug connector assemblies rated for one voltage from being plugged into electrical wiring devices rated for a different voltage.