Power plants are industrial facilities that produce electricity from primary energy. Most power plants use one or more generators that convert mechanical energy into electrical energy in order to feed the electrical grid for society's electrical needs. The exception is solar power plants, which use photovoltaic cells (instead of a turbine) to generate this electricity. The type of primary fuel or primary energy stream that provides a power plant its primary energy varies. The most common fuels are coal, natural gas and uranium (nuclear energy). An essentially used primary energy flow for electricity generation is hydroelectricity (water). Other streams used to generate electricity include wind, solar,geothermal and tidal.

Cathodic protection is a technique used to control the corrosion of a metal surface by making it the cathode of an electro chemical cell. A simple method of protection bonds the metal to be protected to a more easily corroded 'sacrificial metal' to act as the anode. The sacrificial metal then corrodes instead of the protected metal. For structures such as long pipelines, where passive galvanic cathodic protection is not adequate, an external DC power source is used to provide sufficient current

Power quality is the degree to which the voltage, frequency, and wavefor of a power system conform to established specifications. Good power quality can be defined as a constant supply voltage that remains within the prescrbed range a stable AC frequency close to the nominal value, and a smooth waveform of the voltage curve. In general, it is useful to consider power quality as the compatibility between what is coming out of the outlet and the load that is plugged into it.The term is used to describe the electrical energy that drives an electrical load and the load's ability to function properly. Without adequate power,the electrical device may malfunction,fail prematurely,or not work at all.

Low Voltage electrical installations are energy systems aimed at final low-voltage consumption of electricity in homes, offices and small companies. In the electrical installation, the electricity is usually taken from the public distribution network. IIS inspection body performs inspection activities in the area of:

• Technical inspections (first, periodic and extraordinary) of electric power plants, equipment and electrical devices in accordance with the Regulations for the use of electrical installations and electrical equipment,
• Technical inspection of low-voltage electrical installations in accordance with the Protection Regulations of low-voltage networks and the associated transformer stations and the rule book for the Use of Electric Power

The ATEX directives are two EU directives that describe the minimum safety requirements for workplaces and equipment used in explosive atmospheres. 'Protective systems intended for use in 'explosive atmospheres' are designed units, which are intended for immediate stopping of the event explosion and/or to limit the range of explosive- the flame and the explosive pressure. 'Explosive atmospheres' are mixtures of air under atmospheric conditions and combustible substances in the form of gas, vapors, mists or dust in which, upon ignition, the combustion will spread to the entire unburnt mixture.