Adjustable Transition Coupler for Metal Clad Cable Installation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing use of large metal clad cable sizes in commercial buildings requires a more versatile coupler that can accommodate a range of outer diameters and various conductor bundle configurations, while adhering to standards that prevent the metal sheath from passing through, complicating the selection and installation process.
Innovation Solution
An adjustable transition coupler with a hollow cylindrical section, an extension member, and an insulator with a movable stop plate, allowing for a wide range of outer diameters and securement of both armored and metal clad cables to electrical metallic tubing or rigid conduit, featuring a strap with adjustable fingers and a thumb screw for easy adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple different fittings are used to handle specific metal clad outer sheath diameter ranges, then the coupler can accommodate various cable sizes, but the device complexity and installation time increase
Solution Approach 1:
The coupler is designed with an adjustable stop mechanism that can be positioned at different locations along the coupler body, allowing a single coupler design to accommodate multiple cable outer diameter ranges. This eliminates the need for multiple different fittings and reduces device complexity while maintaining versatility.
Solution Approach 2:
The stop is made adjustable rather than fixed, allowing it to be repositioned according to the specific cable size being installed. This dynamic adjustment capability enables one coupler to serve multiple functions across different cable diameter ranges.
2Reliability
If various standards organizations require the metal outer sheath to be physically prevented from passing through the coupler, then safety standards are met, but the device complexity increases
Solution Approach 1:
The stop acts as an intermediary element between the cable sheath and the coupler interior. It provides the necessary physical barrier to prevent sheath passage while maintaining a relatively simple coupler structure. The stop can be adjusted to different positions depending on the cable size, providing safety without excessive complexity.
3Reliability
If the coupler must allow the conductor bundle to pass through readily while preventing the sheath from passing through, then electrical functionality is maintained, but the device complexity increases
Solution Approach 1:
The coupler interior is designed with differentiated zones: one area provides a barrier (the stop) to prevent sheath passage, while another area (beyond the stop) allows free passage of the conductor bundle. This local differentiation of function achieves both safety and electrical functionality without requiring complex overall structure.
Data Source
AI summary
An adjustable transition coupler for coupling AC/MC to conduit, the coupler having a body with a hollow cylindrical section and an extension member with a curved section, the cylindrical section having a slot to allow passage of a stop plate. The coupler has an insulator with a hollow bushing at one end for insertion into a cavity of the cylindrical section and a stop plate extending radially outward, the stop plate movable by an adjustment screw between minimum and maximum deflections. The stop plate stops AC/MC from passage into the cylindrical section. The hollow bushing stops the conduit positioned in the hollow cylindrical section from passage into the extension member. The coupler has a strap with a curved section complementary with the curved section of the extension member so as to secure a range of AC having different outer sheath diameters.