Digital multimeter EKF IN-180701-BM830B

In order to check the presence of an electrical connection in the circuit, you need to convert the multimeter into small resistances mode. Two probes of the device must be touched to two different points of the chain of interest. So you can check the quality of the connection in phase, neutral and grounding veins.

determine the inextricability of the circuit by resistance values. If the multimeter shows small values ​​between the ends of the core, then there is no break and the chain works properly. High resistance signals the availability of problems. It can be either a cliff and a bad connection of contacts. In this case, it is necessary to check the electrical installation and electrical products - sockets, distribution boxes to make sure of the reliability of contacts and, if necessary, tighten the terminals. After prophylactic measures, the circuit is again checked for a cliff.

Such "phones" chains will help to identify faulty sockets, switches and electrical appliances.

Checking the isolation with a megommeter

between the two points of the connection of one line of the resistance value should be minimal. However, between two different conductors, the resistance should be high - this means that the insulation ensures the absence of current leaks. This is especially important, taking into account the fact that impaired insulation can lead to a short circuit and, as a result, fire.

Since there are many reasons that can cause damage to insulation (moisture exposure, pushing wires during the installation of electrical installation products, a nail pierced the wire, a rubber insulation, rodents), it is important to regularly check the electric circuits in order to prevent it from preventing negative consequences.

During the verification of the conductors, it is necessary to exclude the impact of external (induced) voltage on them. Disconnect the voltage in the studied area of ​​the circuit, remove the plugs of all electrical appliances of the circuit from the sockets of the fork, and also turn off the rest of the equipment in the room. Disconnect the desired wire in the shield (but only after turning off the voltage at the chain area!).

A special device is used for an accurate check of insulation resistance - a megommeter. But at home to check the lack of short circuits in the chain in the most extreme cases, you can use a multimeter.

Install the regimen of the largest resistance in the device and touch the probes of two cores, for example, phases and neutrals. High resistance indicators expressed in megaums indicate a good state of isolation. Low values ​​may indicate the presence of damage and should be a reason for a more thorough test.

in a similar way, you need to check the pairs of phase/ground and neutral/ground.

Typical causes of low insulation resistance:

- the wire is punched with fasteners (screw, nail);

- the contact of the electrical installation device with water (for example, a raw wall);

- the wiring is damaged by rodents;

- during the repair of the outlet (switch), wires were praised;

- rubber isolation