Università Roma Tre

Physiological effects of electricity. Skin and body resistance. Earth electrode. Earth electrode resistance, earth potential rise, step and touch potentials. Earthing system. IEC terminology: TN networks (TN-C, TN-S); TT networks; IT networks. Direct and indirect contact and protection. IEC protection classes. IP code. Residual-current device. Indirect contact protection without power supply breaking. Double-insulated equipment. Grounding system. Isolated power-distribution system. Isolated heart connections. SELV. PELV. Class III appliances. FELV. Static electricity. Measurement of the earth-electrode resistance. Measurement of the fault path impedance. Measurement of the step and touch potentials. Test of residual-current device. Test of the grounding system. Measurements of the isolated heart resistance. Electrical-safety codes and standards. Safe distribution of electrical power supply in health-care facilities. Patients’ electrical environment. Emergency-power systems. Biological effects of electromagnetic fields and electromagnetic field shielding.

Vito Carrescia- Fondamenti di Sicurezza Elettrica- edizioni tne