Roof Junction Box Waterproof Pass-Through for Rail Mounting
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Solution Overview
Problem
Existing outdoor junction boxes are poorly integrated with exterior surfaces, leading to water and snow accumulation, and are difficult to install, with limited ability to attach to roofs via rails and flashings, and are not cost-effective for various wire types.
Innovation Solution
A waterproof mountable junction box with a housing unit and enclosing unit, featuring fixation points, a bracket with lip fasteners and clips, and a rubber seal for securement to roofs, allowing direct or indirect attachment via flashing or rail, and accommodating various rail and bracket configurations for secure and water-sealed engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If standard outdoor junction boxes are used, then basic cable connection is achieved, but water and snow accumulation occurs due to poor integration with exterior surfaces
Solution Approach 1:
The junction box is divided into a housing unit and an enclosing unit that can be separately assembled. The housing unit includes bottom pass throughs and fixation points, while the enclosing unit provides the sealed cover, allowing each component to be optimized for its specific function and facilitating proper integration with exterior surfaces
Solution Approach 2:
A bracket assembly with lip fasteners and bracket clips serves as an intermediary component between the junction box and the roof/rail structure. This intermediary mechanism enables secure attachment while maintaining proper positioning that prevents water and snow accumulation
2Ease of operation
If existing outdoor junction boxes are installed, then cable routing is possible, but installation difficulty increases due to limited attachment options
Solution Approach 1:
The bracket assembly is designed with multiple attachment methods including lip fasteners for direct attachment and bracket clips for rail mounting. The housing unit includes multiple fixation points that accommodate various mounting configurations, making the system universally applicable to different installation scenarios without increasing complexity
Solution Approach 2:
The bracket and fixation points are pre-configured on the housing unit during manufacturing. This preliminary preparation allows installers to simply attach the pre-assembled unit to the roof or rail without complex field assembly, significantly easing installation while maintaining attachment security
3Reliability
If conventional junction boxes are used, then basic waterproofing may be achieved, but securement to roof via rail and flashing is not possible
Solution Approach 1:
The junction box system adds a vertical mounting dimension by enabling attachment to rails that extend from the roof surface. The bracket assembly with lip fasteners provides attachment in the vertical dimension, while bottom pass throughs accommodate conduit routing, creating a three-dimensional mounting solution that maintains waterproofing while enabling diverse configurations
4Ease of manufacture
If standard junction boxes are installed, then cable connection is achieved, but cost-effectiveness decreases due to limited wire type accommodation
Solution Approach 1:
The housing unit is designed with multiple bottom pass throughs and fixation points that can accommodate various wire types including THHN, THWN, and other common electrical conductors. The universal design allows a single junction box model to serve multiple wiring applications, reducing the need for different specialized boxes and improving cost-effectiveness
Data Source
AI summary
A junction box mountable on a roof surface, comprising a housing unit and an enclosing unit, the housing unit and enclosing unit combining to form a waterproof assembly. The housing unit is mountable to a roof surface via a flashing having a continuous, raised waterproofing track that mates with a waterproofing recess in a bottom surface of the housing unit to create a waterproofing zone inside the housing unit. At least one bottom pass through is located within the waterproofing zone and provides a channel from the internal housing area through the roof surface.