What are circuit breakers and distribution boxes?
Before learning about the disassembling and replacement of circuit breakers, one should learn first the overall construction of the distribution boxes and circuit breakers. These will help you better understand the process of functioning as well as the safety and effectiveness of the replacement process.
A distribution box is a steel panel installed inside the building which is fixed in a wall position and contains an array of electricity switches designed to control the turning on/off of electrical circuits. The shape of a distribution box typically includes an optional small door to conceal and shield these switches from accidental injury or touch. The most important component in such switches is the circuit breaker, whose main role is to prevent circuit overloading, as well as protect lines, sockets, and the connected electrical appliances from damage.
The structure of a circuit breaker also includes some important parts, including:
- Release: For detecting the change of current. When the current is greater than the set value, the release will automatically disconnect the circuit to prevent overload or short circuit.
- Contact information: Metal contacts that connect circuits to ensure current flows through the circuit. When the circuit breaker is tripped, the contacts will open or close the circuit.
- Arc extinguisher: After the circuit switch is disconnected, the arc extinguisher will immediately extinguish the arc to avoid the arc producing fire or other hazards.
- Framework: As the external housing of the circuit breaker, the framework will enclose the internal components and offer stable mounting for the internal components in the distribution box.
- Operating mechanism: consisting of spring or electromagnetic mechanism, which will manage the opening and closing operation of the circuit breaker.
Once you know these basic structures, you can more accurately remove and install circuit breakers, and the entire process will be safe and efficient. Please make sure to disconnect the power supply and ensure the safety of the operating environment and tools before proceeding with the actual operation.
Why is it important to remove the circuit breaker
Like any other device, circuit breakers also have a lifespan. Most circuit breakers have a lifespan of up to 30 years, but in older buildings, outdated network equipment will eventually require electrical upgrades.
With the aging of building circuit breakers, people are beginning to worry. In addition to frequent circuit breaker tripping, you may also notice the following situations:
- Wear or burn of wires
- Smokey or burnt flavor
- Buzzing or crackling sound
- The socket feels very hot to the touch
All of the warning signs listed above are that something is amiss with the distribution box. It may be important to know when and how to remove the circuit breaker from the panel before a component ignites a fire.
Steps to remove the circuit breaker from the distribution box
Preparation work needs to be done well
- Before operation, be sure to turn off the main power and ensure that the distribution box is completely powered off.
- For current systems, it is necessary to disconnect all phase and neutral wires and use a voltage tester or multimeter to confirm that there is no voltage in the circuit, in order to avoid the risk of residual current.
- At the same time, wear necessary personal protective equipment such as insulated gloves, goggles, and rubber soled shoes to prevent electric shock or arc injuries.
- Prepare the necessary tools, including screwdrivers, wrenches, insulation tape, and handles.
Here is how to remove a circuit breaker:
1. Use a screwdriver to remove the front cover of the distribution box, exposing the internal wiring and circuit breaker
2. Check the type of circuit breaker
- Fixed circuit breaker: directly fixed in the distribution box by screws, requiring disassembly of wiring and fixing screws.
- Pull out circuit breaker (commonly used in high voltage or industrial equipment): requires the use of a dedicated handle to shake it from the “working position” to the “test position” or completely pull it out
3.Use a detection probe to check the voltage (to verify if you have powered off).
4.Insert a Phillips screwdriver and unscrew the terminal screws.
5.Disconnect the wires connecting the circuit breaker.
6.Remove the circuit breaker from its installation position.
7.Check for any visible damage. If you find that the circuit breaker is worn or damaged, please purchase a replacement with the same model of circuit breaker.
8.Replace the new parts and install the new circuit breaker on the wires to replace the old one.
9.Once you have safely installed the wires, you can turn on the main power again for testing.
Suggestions for subsequent maintenance and installation
Cleaning and Inspection
- After removing the circuit breaker, clean the dust inside the distribution box and check whether the wiring terminals are oxidized or loose
Replace with a new circuit breaker
- Ensure that the rated current and breaking capacity of the new circuit breaker are consistent with those of the old model to avoid overload risks
- When wiring, follow the principle of “left zero, right fire” and ensure that the ground wire is reliably connected
Summarize
The safe removal of circuit breakers from distribution boxes requires proper procedure and adequate preparation. By following the above procedures, you can indeed reduce risks and extend equipment life. Just remember, power operation should not be taken lightly. If you are a novice and have no idea about distribution boxes and circuit breakers, please seek professional help in the first place!
Here are some information that you may have just been interested in:
6 key points on how to choose a distribution box
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What is the Function of a Distribution Box in Electrical Systems
