Lockable Insulating Cover for Electrical Distribution Board Terminals
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Solution Overview
Problem
There is a risk of electrocution when working on electrical distribution boards due to the potential premature re-energization of circuits, either by accidental operation of isolation switches or circuit breakers, especially when covers or blanking modules are removed or fall off, and there is no effective mechanism to prevent unauthorized reconnection.
Innovation Solution
A shock prevention device with an insulating body and a moveable element that can be locked in place to cover conductor terminals and prevent accidental reconnection, featuring a locking mechanism such as a padlock or barrel lock to ensure secure engagement between the device and the distribution board housing, thereby preventing unauthorized removal and re-energization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic covers or electrical insulation tape are placed over circuit breaker switches to prevent accidental reconnection, then the risk of electrocution is reduced, but the device can be accidentally removed or the tape can fall off prematurely allowing premature re-energization
Solution Approach 1:
The device is prepared in advance with a moveable element that can be positioned to engage with the circuit breaker switch before work begins. The locking mechanism is pre-configured to secure the insulating body in place, preventing premature removal. This preliminary preparation ensures that the protective covering remains securely attached throughout the work process, eliminating the risk of accidental removal or premature re-energization.
Solution Approach 2:
The protective device is divided into distinct functional segments: an insulating body for electrical isolation, a moveable element for engagement with the circuit breaker switch, and a locking mechanism for securing the assembly. This segmentation allows each component to perform its specific function effectively - the insulating body provides electrical protection, the moveable element ensures proper positioning, and the locking mechanism prevents premature removal, collectively enhancing both reliability and stability.
2Reliability
If isolation switches are used to electrically isolate stab conductors from bus conductors, then unused conductors can be isolated, but the switches can be accidentally operated causing premature re-energization
Solution Approach 1:
The moveable element acts as an intermediary between the insulating body and the isolation switch. When positioned in the engaged state, it physically blocks the operation of the isolation switch, preventing accidental activation. This intermediary mechanism ensures that the isolation switch cannot be operated while the protective device is in place, maintaining electrical isolation reliability while preventing unintended operation.
Solution Approach 2:
The device applies preliminary anti-action by positioning the moveable element to counteract any potential operation of the isolation switch before such operation can occur. The locking mechanism further reinforces this by securing the insulating body in a position that prevents switch activation. This preliminary prevention ensures that even if someone attempts to operate the isolation switch, the moveable element and locking mechanism will block the action, maintaining safe isolation.
3Reliability
If circuit breakers are removed and blanking modules are used to cover stab conductors, then electrocution risk is reduced, but the blanking modules can be removed allowing premature reconnection
Solution Approach 1:
The device is prepared in advance with a moveable element that can be positioned to engage with the circuit breaker switch before work begins. The locking mechanism is pre-configured to secure the insulating body in place, preventing premature removal. This preliminary preparation ensures that the protective covering remains securely attached throughout the work process, eliminating the risk of accidental removal or premature re-energization.
Solution Approach 2:
The protective device is divided into distinct functional segments: an insulating body for electrical isolation, a moveable element for engagement with the circuit breaker switch, and a locking mechanism for securing the assembly. This segmentation allows each component to perform its specific function effectively - the insulating body provides electrical protection, the moveable element ensures proper positioning, and the locking mechanism prevents premature removal, collectively enhancing both reliability and stability.
Data Source
AI summary
A shock prevention device for an electrical distribution board having at least one incoming terminal and one or more bus conductors for distributing electrical power from the incoming terminal to a plurality of outgoing conductor terminals projecting from a housing of the distribution board, the shock prevention device comprising an insulating body adapted to receive and shroud at least one conductor terminal; a moveable element moveable relative to the body so as to place the device in one of a first configuration in which the device can be fitted to or removed from the distribution board so as to cover the exposed terminal and a second configuration in which the device is braced between the conductor terminal and part of the distribution board housing, whereby removal of the device is prevented; and means for locking the moveable element in the second configuration.