Measurement of insulation damage due to surges in electronic equipment (computers, TV, video, etc.) and facilities are increasing for years. This is due to the employment of these surge every day sensitive electronic components. In particular, computer systems can suffer significant damage or even shredded if not properly protected. The cost of these damage produced in own equipment or installation, you need to add costs added by absence of service for days. CAUSES of TRANSIENT OVERVOLTAGE causes that cause a transient overvoltage are varied, but all of them can encompass in 4 groups which are described below:-a direct Ray, impact case in that it directly reaches the building, making that installation drivers are subjected in short periods of time at very high potential that cause the instantaneous destruction of electronic equipment connected to such a installation. -Distant impact, cases in which building has not been reached directly by lightning, despite which the operation of the installation is affected due to the wave of expansion that is transmitted via the mains electricity supply lines. -Impacts between clouds, cases in which Ray bounces from cloud to cloud. The electrical installation may be affected due to the loads of reflection that are involved in this atmospheric phenomenon and cause increases in the potential for drivers, especially if they come from outside the building.

-Processes of switching, such as operations power on / off, accidental grounding contacts, switching of inductive or capacitive loads, etc. that make, like that in three previous cases, cause risk of surges that cause faults in the normal operation of the equipment. TESTS established the high voltage installations built according to the standards of the DIN VDE 0100 series have to undergo the tests laid down in the said rule, part 610, when they are installed, modified or extended. These tests not only encompass the different measurements to verify the operation of the measures of protection and equipotential connection, but that they are also valid for check insulation resistance.

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