Sealed Tap-Off Box Breaker Actuation Without Door Opening
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Solution Overview
Problem
Traditional tap off boxes for busway systems compromise the IP-55 and dust/liquid resistant housing when users need to access internal electrical components, leading to potential damage from dust and liquids.
Innovation Solution
A tap off box design with breaker actuators that allow selective toggling of circuit breakers from outside the sealed housing, maintaining the dust and liquid-resistant seal without opening the door, using a housing assembly with a door secured to form a seal and a breaker actuator with a distal end coupled to the circuit breaker and a proximal end extending outside for actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the door is opened to access internal electrical components, then ease of operation is improved, but the dust and liquid resistance is compromised
Solution Approach 1:
A breaker actuator mechanism serves as an intermediary between the external environment and the internal circuit breaker. The actuator extends through a sealed opening in the door, allowing external operation of the circuit breaker without requiring the door to be opened. This mediator transfers the actuating force while maintaining the seal integrity of the housing.
Solution Approach 2:
The door assembly is segmented to include a sealed opening specifically for the breaker actuator. This segmentation allows the door to maintain its dust and liquid resistant seal while accommodating the necessary control mechanism. The seal around the actuator opening is designed to prevent ingress while allowing the actuator to pass through and operate the circuit breaker internally.
2Ease of repair
If the door is opened to adjust circuit breakers, then ease of repair is improved, but reliability of the sealed housing deteriorates
Solution Approach 1:
The breaker actuator serves as a repair-friendly intermediary that allows circuit breaker adjustment without compromising the seal. Technicians can operate the circuit breaker from the outside through the sealed actuator mechanism, eliminating the need to open the door for routine adjustments or repairs, thus maintaining seal integrity while improving ease of repair.
Solution Approach 2:
The system enables self-service operation and adjustment of circuit breakers without requiring door opening. The external actuator allows users to independently operate and adjust circuit breakers while the sealed housing continues to protect internal components, making the system self-sufficient for routine operations without exposing it to environmental contaminants.
3Object-affected harmful factors
If a sealed housing is used to protect internal components, then protection against dust and liquids is improved, but ease of operation deteriorates
Solution Approach 1:
The sealed housing is segmented to include a controlled access point for the breaker actuator. This segmentation allows the majority of the housing to remain sealed for protection, while a specific sealed opening accommodates the actuator mechanism. The actuator itself is designed with a seal to maintain the protective barrier while enabling external operation of internal components.
Solution Approach 2:
The breaker actuator serves as an intermediary control mechanism that bridges the sealed housing and external environment. It allows operators to control circuit breakers from outside the sealed housing without compromising the seal. The actuator mechanism transfers operational commands while maintaining the protective barrier, thus improving ease of operation without sacrificing protection.
Data Source
AI summary
An example tap off box is provided that includes a housing, a circuit breaker, a door, and a breaker actuator. The housing includes walls forming an internal enclosure. The circuit breaker is disposed within the housing. The door is secured to the housing to define a housing assembly, the housing assembly enclosing the circuit breaker. The breaker actuator includes a distal end and a proximal end, the distal end coupled to the circuit breaker within the housing assembly, and the proximal end extending outside of the housing assembly. The breaker actuator is capable of being moved at the proximal end to selectively toggle the circuit breaker from at least an ON position to an OFF position.