Double Containment Junction Box for Wet Well Gas Isolation
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Solution Overview
Problem
Electrical junction boxes in harmful environments, such as wet well pumping systems, face contamination issues where poisonous and noxious gases and odors can damage wiring and devices, and pose risks to personnel when servicing is required.
Innovation Solution
A double containment electrical junction box design where a lower container is in gaseous communication with the equipment enclosure to trap contaminants, and an upper container with sealed conduits and cable seals prevents these contaminants from reaching the service area, allowing safe servicing without exposing personnel to hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional single containment junction box is used in a wet well environment, then the structure is simple and easy to install, but contaminants can migrate to the junction box and damage electrical wiring and devices
Solution Approach 1:
The junction box is divided into two separate containers: a lower container that is in gaseous communication with the wet well to trap contaminants, and an upper container that houses the electrical junctions. This segmentation physically separates the contamination zone from the electrical components zone, protecting the wiring and devices while maintaining a manageable structural complexity through modular design.
2Ease of manufacture
If the junction box is located close to the wet well for ease of wiring, then wiring installation is simplified, but contaminants can easily reach and damage the electrical components
Solution Approach 1:
The lower container is positioned close to the wet well to simplify wiring installation, while the upper container housing the electrical junctions is positioned at a higher elevation. The seal between containers prevents contaminant migration, thus maintaining ease of wiring installation while protecting electrical components from harmful factors.
Solution Approach 2:
The junction box utilizes vertical positioning with the lower container near the wet well and the upper container elevated above it. This vertical arrangement allows wiring installation close to the wet well while using elevation and sealing to prevent contaminant reach to electrical components.
3Ease of repair
If service personnel need to access the junction box for maintenance, then the door can be opened for servicing, but contaminants may escape to occupied places
Solution Approach 1:
The upper container is designed with an openable door for servicing electrical junctions, while the lower container remains sealed to trap contaminants. This segmentation allows service personnel to access the upper container for maintenance without opening the lower container, thus enabling ease of repair while preventing release of contaminants to the environment.
Solution Approach 2:
The seal between the lower and upper containers acts as an intermediary barrier that allows independent access to the upper container while maintaining containment of contaminants in the lower container. This intermediary sealing mechanism enables servicing without compromising the containment system.
4Reliability
If a seal is installed between containers to prevent contaminant migration, then electrical components are protected, but the structure becomes more complex and difficult to assemble
Solution Approach 1:
The junction box is segmented into two containers that can be assembled as a unit with the seal pre-installed on one container. This segmentation allows the seal to be integrated into the manufacturing process of individual containers, simplifying the overall assembly while maintaining reliable prevention of contaminant migration between the lower and upper containers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively contains harmful contaminants within the lower container, preventing their migration to occupied areas and reducing the risk of electrical sparking during servicing, ensuring safer operation and device protection.
Implementation Method 1
A seal is located between the containers for preventing the contaminants in the lower container from reaching the upper container
Implementation Method 2
The lower container is in gaseous communication with the equipment enclosure for enabling the contaminants from the equipment enclosure to enter the lower container
Data Source
AI summary
A double containment electrical junction box is interfaced with electrical equipment in an equipment enclosure containing harmful contaminants, such as noxious gases and odors generated in a wet well containing a submersible electrical pump that pumps waste water from the well. A lower container contains electrical wiring connected to the pump, and is in gaseous communication with the well for enabling the contaminants from the well to enter the lower container. An openable upper container contains electrical junctions for the electrical wiring from the lower container. Cable and integrity seals between the containers prevents the contaminants in the lower container from reaching the upper container, to prevent migration of the contaminants away from the lower container.