Engineering parameters of the electrical network must comply with all provisions of the regulations. In order to verify and further inspection is carried out a series of electrical work. Cycling is the measurement of insulation resistance and earthing set the appropriate inspection agency. From time to time employees is measured as a prophylactic in order to establish a defective electrical equipment. Such measurements preventive reduce the risk of ignition wiring and, consequently, preventing any accidents. For carrying out of electrical work is the Electrical Laboratory, equipped with the latest equipment. Lab experts are highly qualified engineers who conduct tests in the electrical installations of electrical networks, voltage up to 1000 V. One of the most important indicators of the electrical equipment is the insulation resistance. It is for this reason it is extremely important to measure insulation systematically on all of the power lines. This will find out in advance, the level of deterioration of insulating materials. Indicator insulation resistance under any circumstances must be extremely stable. If his figures reach low marks - possible fire, which may well lead to disastrous consequences of its own and even the victims. The easiest way to avoid the risk, and therefore - should strictly adhere to all rules and code of practice for design and operation of electrical networks. The issue of electrical insulation must be given special attention, because of leakage of electric current systems usually have a place to be because of poor quality of electrical insulation. Progress in measuring the electrical insulation must be carried out by engineers way of measuring the power lines and networks in the application of a specialized unit - megamometra. Electrical works carried out to determine compliance with its requirements of normative documents. Typically, this process occurs in conjunction with other types of measuring work. The main purpose is to carry out verification work to determine the protective performance electrical system.