How to quickly check for electrical leakage in home circuits
In the process of using electricity, you must pay attention to safety and promptly investigate the causes of leakage problems. Let's learn together how to judge whether a circuit is leaking, what tools and instruments are needed, and what issues should be paid attention to when detecting circuit leakage.
To detect whether a circuit is leaking, you need professional testing tools. Generally, a megger is used to detect the circuit. It is not recommended to use a multimeter, because household circuits are generally 220V, and the multimeter is suitable for measuring low voltage. Only when the leakage situation is serious, the multimeter can Electric leakage detected.
If there is no megohmmeter, you can consider using a multimeter. You need to adjust the multimeter to 200 megohms and the pointer to 10K, and then measure the leakage fault.
Specific inspection methods:
Turn off the input switch, unplug all electrical appliances, and measure the resistance of the live wire, neutral wire, and live wire and ground wire to be more than 1 megabyte, which means the line insulation is good.
Determine the leakage situation based on the measurement results: 500K to 1M ohm is general insulation, 10k to 200K is mild leakage, and below 7K ohm is severe leakage, which will cause the leakage protector to trip.
The megohmmeter, also known as the megohmmeter, cuts off the power to the line when measuring, and uses the megohmmeter to shake it directly.
A 500V megger can be used for low-voltage circuits. Measured against the ground, if the insulation is less than 0.5 megohm, it means the insulation is not very good and needs to be checked section by section.
Note: When measuring with a megometer, no electrical appliances can be connected to the circuit to ensure the accuracy of the measured values.
The national standard determines that 30 mA or more is the initial protection value, that is, when a current of 30 mA or more flows through the heart during an electric shock, an electric shock will occur and be life-threatening.
Be sure to check whether a leakage protector is installed, and it must be installed at the front end of the incoming line. It is usually checked once a month to ensure that the protector can work properly.
Inspection method: Press the test button to trip immediately. If there is no response, it needs to be replaced immediately.
The above is a quick way to check the leakage of circuits in your home. Use a megger to detect leakage in the circuit. I hope it will be helpful to everyone.
