When operating the domestic network frequent power problems, which can manifest itself in different ways. The most common case is considered when the voltage in them is very different from the nominal value. Most often it is below of the rules, which is explained by a number of circumstances.
The main causes of failure
The main reasons for low voltages can be considered:
- Incorrectly chosen for the cross section of the power cable or a branch of it in the load direction.
- Bad contacts in the field of registration of taps.
- Overload of the power transformer on regional substation due to phase unbalance.
note: The most common cause of low voltage on the network is the latest case.
In the presence of structural errors in the selection of the supply cable or phase imbalance malnutrition issues should deal with the local network company. The user can change something only on the wiring area within the boundaries of his own apartment. The same applies to unreliable contacts found in the introductory panel or outlet.
Ways to solve the problem
The first thing you need to do when it detects an undervoltage - is to ask the housemates, and is not observed if they have the same thing. If the answer is yes - the reason will be common to all, and look for it to be on the side of the substation.
Procedure
All that can be done in this situation - to call the local network company and to inform about the problems with the power supply.
This case needs additional explanations given below:
- To ensure lower voltage from the neighbors - it is not necessary to have a special measuring instrument.
- It will be sufficient to enable the bulb in the chandelier and assess the level of brightness of the glow.
- Before requesting network organization should prepare data for "subsidence" voltage (in exact figures).
To do this, the user must at least have in your household voltage meter and be able to handle it.
internal problems
If it turned out that in the neighboring apartments problems with the power supply is not - have to look for the problem in your home wiring. For this it is necessary to disable automatic opening facing the electric meter, and then a multimeter to measure the potential at the ends of the supply cable (pictured below).
Important! Without this device, included in the "Measuring AC Voltage" in the range of 250 or 750 volts nothing to do with the self can not be verified.
If it is already on entering the apartment below norms laid (± 10% from the nominal value of 230 volts or to be exact - 207 Volt), you will need to appeal to the same address as in the case of subsidence in all apartments.
In a situation, when this point voltage is OK - you need to do the following. Enable automatic opening and start checking this option according to the following sequential chain: AB output contacts - Count - the total input line circuit breakers.
The reason for part of the voltage drop in this region may be:
- Poor contact in the connecting blocks.
- Failure of the series-connected devices.
- Damage to the wiring (pictured below).
To resolve the first two issues will need to tighten the screw fastening or replace the defective device. In the latter case you have to restore the wiring at the site of damage.
If the mains voltage "sags" for reasons independent of its owners, and in the network of the company explain this constant overload of the line - the only solution is to buy a network stabilizer.