Series Terminal Housing Layout for UL Air Gap Isolation
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Solution Overview
Problem
Existing electrical connection systems face challenges in space efficiency and air gap isolation, particularly when multiple series terminals need to be mounted in limited spaces, and they often fail to meet the isolation requirements of Underwriters Laboratories (UL) 5.08A without modification.
Innovation Solution
The electrical connection system features a housing with a closed base and angled side walls that allow series terminals to be mounted on a support rail, providing a space-saving arrangement with adjustable air gaps and isolation areas, exceeding the 25 mm spacing requirement for UL 5.08A compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If series terminals are positioned with clear spacing from the supporting plate to create air gaps and electrically isolated areas, then electrical isolation is improved, but space consumption increases
Solution Approach 1:
The patent transitions from two-dimensional spacing on the supporting plate to three-dimensional isolation using housing enclosures. The housing provides vertical and lateral boundaries that create electrical isolation without requiring large horizontal clearances between terminals on the supporting plate.
Solution Approach 2:
The housing acts as an intermediary element between the series terminal and the supporting plate. It provides the necessary electrical isolation and air gaps while allowing the terminal to be positioned closer to the plate, thus reducing space consumption.
2Ease of manufacture
If standard series terminals are used without modification, then manufacturing cost is reduced, but compliance with UL 5.08A air gap requirements cannot be ensured
Solution Approach 1:
The system is segmented into separate functional components: the standard series terminal and the housing. The terminal remains unchanged and can be manufactured using existing processes, while the housing is separately manufactured to provide the necessary isolation and compliance features.
Solution Approach 2:
The housing serves as an intermediary that enables UL 5.08A compliance without modifying the standard series terminal. It provides the required air gaps and isolation while allowing the use of off-the-shelf terminals.
3Area of stationary object
If multiple series terminals are mounted in limited spaces, then space efficiency is improved, but maintaining appropriate air gaps and isolation becomes difficult
Solution Approach 1:
Each series terminal is equipped with its own housing that provides localized electrical isolation and air gaps. This local containment ensures that isolation requirements are met for each terminal individually, even when multiple terminals are densely mounted in limited spaces.
Data Source
AI summary
An electrical connection system having at least one series terminal that can be positioned on a fixed support rail is configured such that the series terminal is arranged in a housing which has a closed base facing the support rail when in the mounted position and two side walls angled thereto which are arranged parallel go and spaced apart from one another. A latching member that can be latched to the support rail is provided on the exterior of the base, and a mounting member on which the series terminal is retained is provided on the interior of the base.