Knowledge and understanding: Understand the concept of risk related to the machinery and electrical energy use. Know the prevention and protection methods and measures aimed to reduce those risks, with specific reference to the technical standards of this sector and the connected laws. Applying knowledge and understanding: Choice of the protection devices against overload and short circuit. Knowledge and understanding on the effects of the electrical current on the human body. Knowledge on the regulations and documentations regarding the electrical safety in power systems and in particular regarding the electrical safety in medical facilities. Making judgements: Through the topics covered during the lessons, the goal is to make the students capable of making independent and critical judgements about the measures to ensure the safety in an electrical power system and in particular in those dedicated to the medical facilities. Communication skills: The mastery and correct understanding of the topics covered in the teaching are the means to reach an adequate ability to present arguments on topics involving power systems safety in a clear and effective way. Learning skills: The concept taught in the course aim to provide the students the necessary tools to understand the importance of the electrical safety, especially in the medical facilities, and to understand the regulations.

None

1. Choice of overcurrent protection devices 2. Principles of electric safety and grounding 3. Classification and definitions of power systems 4. Supplementary material on power system safety 5. Power systems regulations 6. Inspections in power systems 7. Machinery directive 8. Power systems in medical facilities, emergency power supply, and safety

Slides shown during the lessons and made available for the students. V. Carrescia “Fondamenti di sicurezza elettrica”, TNE, 2016

1. Choice of overcurrent protection devices - Basic principles of physics and electrotechnics - Intervention characteristics (automatic breakers/fuses) - Choice of the protection devices against overload and short circuit 2. Principles of electric safety and grounding - Reasons why implementing a grounding system - LV distribution systems classification (TT,TN,IT) - Earth electrodes, current and voltage fields in the ground, ground resistance of an earth electrode -Effects of the electric current on the human body - Safety curves: current/time and voltage/time - Indirect contacts protection criteria - TT system -TN system - IT system 3. Classification and definitions of power systems - Definition from CEI 64-8 regulation - Classification of power system in relation to the rated voltage - Standard value for the rated voltage - Rated voltage to ground - Classification of the power system in respect to their function - Classification of the distribution systems in respect to the grounding system 4. Supplementary material on power system safety - Safety, damage, and risk - Risk factors in electric installations - Regulatory aspects - Protection against contact voltages - Complete protection against direct contacts - Partial protection against direct contacts - Additional protection against direct contacts by means of a differential circuit breaker - Protection against indirect contacts without the automatic interruption of the power supply 5. Power systems regulations - Regulatory framework - Types of documents 6. Inspections in power systems - General information on the inspection - Visual evaluation - Measures and tests on the power systems - Initial and periodic inspections - Grounding system prescriptions 7. Machinery directive 8. Power systems in medical facilities, emergency power supply, and safety - Electrical safety in medical facilities - Electro-medical devices - Limits for leakage currents in medical equipment - Electro-medical systems - Supply units for medical use - Design requirement - Reporting and verification of the power systems - Medical facilities - Patient zone - Protection and supply - Protection with the IT-M system - Medical isolation transformer - Isolation verification device - Emergency and safety supply - Regulatory requirements for the safety supply - Emergency lighting - Safety services supply in medical facilities - Safety lighting in medical facilities - inspection in medical facilities - Examples (power system in an hospital, power system in a surgery, power system in hospitalization rooms)

Theory classes

Written exam and oral interview.