Very often people underestimate the importance of testing electrical installations or electrical equipment at the end of repair or construction work. Such negligence in relation to security measures can play a cruel joke with the owner of the apartment or enterprise. In the best case, you will get off with a short circuit in the room, and your automatic fuse will work, and at worst, this can cause wiring with further melting of wires, which in turn will easily lead to a fire.
Testing of electrical equipment.
The test of electrical equipment is carried out subject to all requirements and safety regulations. Comparison of the characteristics of the insulation of the wiring should be carried out at the same temperature level or its close value. If you make electrical measurements it is not possible in this situation, then you need to make a temperature recalculation according to the instructions for the use of certain types of electrical equipment.
Before testing the insulation of electrical equipment, the outer surface of the insulation must be cleaned of dirt and dust, except if the test is performed in a way that does not require disabling devices.
The voltage during the test should change smoothly. The rate of change in indicators should be such that the specialist can trace this by devices. When the indicators reach the required value, the voltage should be unchanged after a certain time. After the desired exposure, the instrument readings are required to slowly decrease to the indicator no more than 1/3 of the testing and turn off.
Testing electrical installations.
Specially trained people should conduct tests of electrical installations, and it is better not to take up such a job without skills and experience in work without skills and experience.
It must be recalled once again that electricity is a serious thing and you also need to take it seriously. For this reason, it is better to entrust the testing of electrical installations to a group of professionals who will do all the work efficiently and for a moderate fee.
There are main types of work that specialists provide in this field of services:
• Frozen insulation resistance. These works related to checking the resistance indicators of the insulation of the wires in relation to other grounded wires. If these measurements give an unsatisfactory result, then you need to measure in relation to each wire, as well as the resistance of the insulation of the wire.
• Measurement of the resistance of the ground circuit. Checking the resistance of the ground contours is carried out in order to identify their compliance with the requirement of regulatory documents. In an electrical installation with a deaf -posed neutral and a voltage of up to 1 kV, the resistance of the grounding conductors, to which neutrals of transformers or generators are attached, or conclusions of the sources of single -phase current should be the corresponding passport of the installations.
• test of the availability of a circuit of grounding and grounding elements. Measurements are carried out in order to determine the integrity of protective conductors.
• Checking the phase Nul chains. Checking the resistance of this loop and a single -phase circuit current is carried out to check the reliability of the operation of the closing protection.
• Check «Automation». During this check, protection for such switches should work at the right time. It depends on the rated current, as well as the temperature value of the environment, which in turn is determined according to the data of the device passport.
