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The paper presents issues regarding impedance spectroscopy analysis for the identification of intrinsically safe circuits. The first part of the paperwork presents the explosion risk. In industrial applications, the presence of flammable substances leads to additional requirements for technical equipment used in such spaces. On the other hand, technical equipment used in such spaces must remain in working order even when the risk of explosion is high. For this purpose, equipment used in such spaces should be asses...

In the evaluation activity of technical equipment intended to be used in potentially explosive atmospheres, by national and international legislation, non-compliant aspects were often reported regarding the choice, installation and maintenance of this explosion-proof equipment. The following main aspects were pointed out: the equipment that was initially chosen and installed appropriately for the specific application but later, over time, improperly maintained; respectively, the situation in which they were inappr...