Two-Part Cable Coupling for Hazardous Area Sealing
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Solution Overview
Problem
Cable glands used in hazardous areas often require difficult access for installation, especially when the luminaire is in a hard-to-reach position, and factory sealing is compromised by the need to access the interior for cable gland assembly, which is not suitable for environments requiring complete sealing.
Innovation Solution
A coupling system comprising two parts that can be separately wired and fixed to a surface, with the first part pre-installed during manufacturing and the second part connected later, eliminating the need for post-installation cable gland assembly and ensuring complete sealing without interior access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional cable gland with multiple parts is used, then the cable can be sealed and gripped, but the complexity of assembly increases and interior access is required
Solution Approach 1:
The cable gland is divided into two separate parts: a first part that can be pre-assembled and sealed, and a second part that is connected later through a coupling mechanism. This segmentation allows the sealing function to be achieved without requiring interior access, as the second part can be connected from the exterior through the coupling
Solution Approach 2:
A coupling mechanism serves as an intermediary between the first and second parts of the cable gland. This coupling allows the two parts to be connected without requiring disassembly or interior access, effectively mediating the connection between the pre-assembled first part and the subsequently connected second part
2Ease of operation
If the luminaire is in a difficult to reach position, then installation flexibility is reduced, but using a traditional cable gland requires access to the interior which is not feasible
Solution Approach 1:
The first part of the cable gland, including the sealing components and cable grip, is pre-assembled and sealed before installation. This preliminary action allows the majority of the assembly to be completed without requiring interior access, making the installation feasible for luminaires in difficult to reach positions
Solution Approach 2:
By segmenting the cable gland into two parts that can be connected externally through a coupling, the system allows the first part to be pre-installed in hard-to-reach positions while the second part is connected later from accessible locations, thereby maintaining adaptability to various mounting positions
3Reliability
If the apparatus is factory sealed, then safety is improved, but post-manufacturing cable gland assembly compromises the sealing
Solution Approach 1:
The first part of the cable gland is pre-assembled and sealed during the factory sealing process, maintaining the integrity of the factory seal. The second part is designed to be connected later through the coupling mechanism without compromising the pre-established seal, thus preserving both factory sealing integrity and post-manufacturing assembly capability
Solution Approach 2:
The coupling mechanism acts as an intermediary that allows the second part to be connected to the pre-sealed first part without breaching the factory seal. This external connection method preserves the factory sealing integrity while enabling necessary post-manufacturing cable gland assembly
Data Source
AI summary
A coupling (1) comprising: a first part (2) sized and shaped to fit through an orifice in a surface and having a mounting surface (5) for abutting against the surface, and comprising a body having a through bore (7); and a first connector part (13) having a termination (15) for at least one conductor, and a connection member (16) for each termination (15); and a second part (3) in threaded engagement with the first part (2), the second part comprising a body having a through bore (10) in communication with the through bore (7) of the first part (2); a second connector part (14) having a connection member (17) complementary to each connection member (16) of the first connector part (13) so that the connection members (16, 17) of the first (13) and second (14) connector parts can engage each other and a termination (19) for a conductor for each connection member (16) of the second connector part (3).