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To give the basic knowledge of electricity - as much as to be able to recognize the danger of electricity and to avoid it
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Electrical Qualification of persons start learning
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Ordinary Person; Instructed Person; Skilled person
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Person without any qualifications
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A person adequately advised or supervised by skilled person to enable him or her to avoid dangers which electricity may create
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A person with reevant education and experience to wnable him or her to avoid dangers which electricity may create
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Threatening danger on electrical equipment start learning
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accident by electric current; fire; explosion
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Every employee must get at least the lowest qualifications start learning
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according to government regulation No. 194/2022
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These are the employees (ordinary persons) acquainted with regulations on treatments with electric equipment and aware of the possible danger of electric current
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Safety Extra Low Voltage; Extra Low Voltage; Low Voltage; High voltage
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a.c. 50 V to 1000 V; d.c. 120 V to 1500 V
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a.c. > 1000 V; d.c. > 1500 V
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Allowed Activities (operation) Part 1 start learning
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1. They can independently manipulate only electrical equipment of a SELV; and low voltage but pnly if they cannot touch the live parts during a normal operation. 2. Switching on and off, plugging into the socket, moving connecting cables, exchange of bulb when switched off and exchange of safety fuses
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Allowed Activites (operation) part 2 start learning
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3. They can perform maintenance work without the dismantling with instruments (dry cleaning) when the equipment is switched off. 4. There must be a safe distance from unprotected working parts unfer voltage up to 1 kV at least 1 meter
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Forbidden Activities Part 1 start learning
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1. To repair electrical appliances and distribution network. 2. To work on parts of electrical equipment under voltage. 3. To use electrical equipment suspected of damage
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Forbidden activities part 2 start learning
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4. To move electrical appliances connected to the network (computers, calculators etc.) unless they are intended for such usage - (electrical hand tools) - unplugging of the socket. 5. To touch electrical equipment by wet parts of the body. 6. To clean the surface of electrical equipment by wet means
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conducting part which js intended to be energized in normal use, including a neutral conductor
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conductive oart of electric equipment, which can be touched and which is not normally live but which can become live when basic insulation fails
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insulation of hazardous live parts providing the first protection against electric shock
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contact with exposed conductive parts, which have been become live under fault conditions
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all activities necessary to permit the electical installation to function both under normal and abnormal conditions
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any form of work where there is possibility of an electrica hazard
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work on, with or near electrica installation
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Characteristic features of operation start learning
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Direct contact no; application of tools no; Duration of changes temporary
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Characteristic features of work start learning
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direct contact yes; Application of tools yes; duration of changes permanent
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Risk of common computer users regarding Health and Occupational Safety start learning
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increasing eye-strain (brightness, blinking); electromagnetic radiation; strain to the neck-spine
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Safety work with computers start learning
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1. the worker at the screen shall have neither the light source nor its reflection in the range of view. 2. the brightness of the objects in the neibhourghood of the screen shall be balanced so as nor to produce big contrasts. 3. distance from screen at least 40cm 4. the artifical enlightning of the room shapl not form dark nooks and overlight places - the upper margin of the active area of the screen shall be on the eye level maximum
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Safety work with computers part 3 start learning
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if possible place a monitor in such way as to prevent the people from having access from its sides
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safety work with computers 3 start learning
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1. the placement of the keyboard: if sitting straight, the arms, placed with their palms on keyboard shall be perpendicular at the elbows. 2. the height of the seat: if the soles are fully tread-down on the floorc the legs shall be perpendicular at knees
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prohibition - white sign with red circular band and crossbar text black
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mandatory action - circular
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warnjng - yellow sign with triangular band
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information - rectangular
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safety limits of steady electric current start learning
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threshold of perception ac 0,5mA, dc 2mA, charge 0,5uC; Threshold of pain ac 3,5mA, dc 10mA, charge 50uC; Let go current ac 5mA, dc 25mA
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limit of selv at live parts start learning
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usual and wet conditions: ac 25V, dc 60V; Very bad conditions - -
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limit of selv when not direct contact start learning
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usual and wet conditions ac 50V, dc 120V; Very bad condtions ac 12V, dc 25V
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the highest permissible touch voltages start learning
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same as contact with live parts: a) permanently acting touch voltage; b) short-term acting touch voltage
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