Voltage is technically the force that moves electrons against the electrostatic field strength to which they are exposed. In other words, voltage is the difference in electric potential between two points in the electric field. Direct current generators such as batteries or batteries generally have a voltage between 1.5 and 110 volts. The voltage of the alternating currents used in households is 220 volts and the voltage of the alternating currents used in industry is 380 volts. The higher the amount of tension, the more dangerous the safety of people exposed to stress. Therefore, the isolation of high voltages is more difficult.

However, if the energy is to be transported to distant points, the voltage must be kept high. The highest voltage transmission line in our country is 380 thousand volts. These lines are strong and long-distance.

Voltmeter is used for voltage measurements. An automobile battery is 12 volts, household electric 220 volts, train lines used 12 thousand and 50 thousand volts. In general, voltages up to a thousand volts are called low voltage and voltages above it are called high voltage.

Cable voltage tests are also performed by authorized laboratories within the scope of electrical tests. During these tests, laboratories take into account the following standards:

• TS IEC 60502-4 cables - Insulated voltages from 1 kv (um = 1,2 kv) to 30 kv (um = 36 kv) - Extruded power cables and their auxiliary equipment - Part 4: Declared voltages from 6 kv (um = 7,2 kv) Test specifications for auxiliary equipment for cables up to 30 kv (um = 36 kv)
• TS IEC 60183 Cables - Selection of high-voltage cables Instructions

• TS EN 61442 Cables - Test methods for auxiliary equipment for power cables with rated voltages 6 kv (um = 7,2 kv) to 36 kv (um = 42 kv)