Electrical Safety at WorkLaajuus (3 ECTS)

Objective

After completing this course the student understands the risk factors of electrical current and the influence on humans. He/she knows the structure of the low voltage distribution system. He/she is able to describe how dangerous touch voltages may arise in connection with different faults.

The student knows the importance of basic and fault protection in preventing electric shock. He/she knows the suitable work practices in electrical installation work and the requirements set by the authorities engaged in electrical work. He/she knows how to organize electrical safety surveillance in an electrical contracting company.

Content

1. The effect of electric current on humans
2. Power distribution system design
3. Formation of touch voltage
4. Protection methods
5. Qualifications of electrical work
6. Safe work practices
7. Initial inspection
8. Key content of SFS-EN 6002 standard

Assessment criteria, satisfactory (1)

1. The student is able to describe how electric current affects humans and what the safe limit values for current are.
2. The student is able to draw up a diagram of the low-voltage distribution system.
3. The student is able to draw up a chart of how dangerous contact voltage consists between the faulty electrical equipment and the part in connection to ground.
4. The student can choose an adequate protective enclosure for electrical devices in residential buildings.
5. The student can determine the maximum cable length of the cable and a suitable fuse in order to reach adequate automatic disconnection of supply.
6. The student knows what kind of electrical work he or she can do
7. The student is able to disconnect the electrical equipment from the power supply in order to work safely.
8. The student is able to list the initial inspection measurements.
9. The student is able to list the different safe work practices.

Assessment criteria, good (3)

1. The student is able to describe how safe limit values for current can be reached with a fault current protection device.
2. The student is able to draw up a diagram of low-voltage distribution and earthing system.
3. The student is able to draw up a chart of how dangerous contact voltage is formed between the faulty electrical equipment and the part in connection to ground, even in the case of a neutral conductor fault.
4. The student can choose an adequate protective enclosure for electrical devices in outdoor installations.
5. The student can determine the maximum length of the cable with different protection devices in order to reach adequate automatic disconnection of supply.
6. The student knows the requirements for a skilled person and for a person in charge of the work.
7. The student is able disconnect the electrical equipment from the power supply and make sure that he or she can work safely.
8. The student is able to list the initial inspection measurements and measure the isolation and circuit impedance.
9. The student passes the training test for SFS-EN 6002 standard.

Assessment criteria, excellent (5)

1. The student is able to describe how safe limit values for current can be reached with different protection methods.
2. The student is able to draw up a diagram of low-voltage and IT-distribution with an earthing system.
3. The students is able to draw up a chart of how dangerous contact voltage is formed in different situations.
4. The student can choose an adequate protective enclosure for electrical devices in outdoor installations and special environments.
5. The student can determine the maximum length of the cable with different protection devices in order to reach adequate automatic disconnection of supply. The student is also able to use other fault protection methods and additional protection.
6. The student knows the good practice for a person in charge of electric work.
7. The student is able to work in the vicinity of live parts. The student also knows the terms for live working.
8. The student knows the content of initial inspection and can do the necessary measurements.
9. The student passes the training test for SFS-EN 6002 standard with the grade of excellent.