The electric control box is a low-voltage power distribution device that assembles switchgear, measuring instruments, protective electrical appliances, and auxiliary equipment in a closed or semi-enclosed metal cabinet or on a screen according to the requirements of electrical wiring. The following is a detailed introduction to the purpose and detection method of the electric control box:

1. Purpose of the electric control box

1. Power distribution: The electric control box can reasonably distribute electrical energy and facilitate the opening and closing of the circuit.
2. Circuit protection: When the circuit fails or operates abnormally, the protective electrical appliances in the electric control box will cut off the circuit or sound an alarm to protect the safety of the circuit and equipment.
3. Parameter display and adjustment: The measuring instruments in the electric control box can display various parameters in operation, and can also adjust certain electrical parameters, and prompt or send signals for deviations from normal working conditions.
4. Convenient operation: The electric control box is usually designed with a structure and interface that is easy to operate, making operations such as power outage, metering, and judgment more convenient.

Electric control boxes are widely used in homes, high-rise buildings, stations, ports, airports, shopping malls, cinemas, enterprises, and other places, as well as in power generation, distribution, and substations.

2. Inspection methods of electric control boxes

In order to ensure the safety and reliability of electric control boxes, they need to be systematically inspected. The following are some common inspection methods:

1. Appearance quality inspection:

• Check whether the appearance of the electric control box is flat and whether there are obvious deformations, scratches, or dents.
• Check whether the paint surface of the electric control box is smooth and uniform and whether there is bubbling, discoloration, or oxidation.

2. Material quality inspection:

• Check whether the materials used in the electric control box have good fire resistance, high-temperature resistance, corrosion resistance, and other properties.
• Ensure that the materials meet relevant standards and requirements to improve the safety and durability of the electric control box.

3. Internal component inspection:

• Open the door panel of the electric control box and check whether the internal components are firmly installed and whether there are any loose or missing components.
• Check whether the rated current, overload protection capacity, and other parameters of components such as switches, fuses, circuit breakers, and wiring terminals meet the requirements.
• Check whether the conductivity of the wiring terminals is good to ensure the reliability of the circuit connection.

4. Electrical performance inspection:

• Use appropriate measuring instruments to detect parameters such as resistance, current, and voltage of each component in the electric control box to ensure its normal operation.
• Conduct insulation resistance tests, withstand voltage tests, etc. to evaluate the electrical safety and reliability of the electric control box.

5. Functional test:

• Operate various switches of the electric control box to check whether they are flexible and have good contact.
• Test the protective devices in the electric control box (such as circuit breakers, fuses, etc.) to ensure that they can operate normally in the event of a fault.

6. Environmental adaptability test:

• Place the electric control box in high temperature, low temperature, high humidity, dust, and other environments to test its performance changes and evaluate its environmental adaptability.
• Conduct impact resistance tests, seismic resistance tests, etc. to evaluate the mechanical properties and durability of the electric control box.

7. Electromagnetic compatibility test:

• Measure the electromagnetic interference intensity of the electric control box in the working state to ensure that it meets the electromagnetic compatibility standard.
• Test the working performance of the electric control box in the electromagnetic interference environment to ensure its anti-interference ability.

8. Safety performance test:

• Check whether the leakage protection device of the electric control box is effective to ensure that it can disconnect the power supply in time in the event of leakage.
• Evaluate the fire resistance of the electric control box to ensure that it has a certain fire resistance time and flame retardant effect in a fire.

9. Marking and document inspection:

• Check whether the markings on the electric control box are clear and complete and whether the content meets the standard requirements.
• Check whether the factory documents, test reports, etc. of the electric control box are complete and the content is accurate.

In summary, the use of electric control boxes is wide and important, and systematic testing of them is the key to ensuring their safety and reliability. During the testing process, operations should be carried out strictly in accordance with relevant standards and requirements to ensure the accuracy and effectiveness of the test results.