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开始学习
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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 开始学习
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Ordinary Person; Instructed Person; Skilled person
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开始学习
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Person without any qualifications
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开始学习
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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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开始学习
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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 开始学习
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accident by electric current; fire; explosion
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Every employee must get at least the lowest qualifications 开始学习
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according to government regulation No. 194/2022
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开始学习
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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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开始学习
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Safety Extra Low Voltage; Extra Low Voltage; Low Voltage; High voltage
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开始学习
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开始学习
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a.c. 50 V to 1000 V; d.c. 120 V to 1500 V
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开始学习
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a.c. > 1000 V; d.c. > 1500 V
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Allowed Activities (operation) Part 1 开始学习
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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 开始学习
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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 开始学习
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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 开始学习
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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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开始学习
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conducting part which js intended to be energized in normal use, including a neutral conductor
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开始学习
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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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开始学习
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insulation of hazardous live parts providing the first protection against electric shock
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开始学习
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开始学习
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contact with exposed conductive parts, which have been become live under fault conditions
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开始学习
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all activities necessary to permit the electical installation to function both under normal and abnormal conditions
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开始学习
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any form of work where there is possibility of an electrica hazard
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开始学习
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work on, with or near electrica installation
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Characteristic features of operation 开始学习
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Direct contact no; application of tools no; Duration of changes temporary
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Characteristic features of work 开始学习
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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 开始学习
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increasing eye-strain (brightness, blinking); electromagnetic radiation; strain to the neck-spine
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Safety work with computers 开始学习
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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 开始学习
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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 开始学习
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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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开始学习
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开始学习
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prohibition - white sign with red circular band and crossbar text black
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开始学习
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mandatory action - circular
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开始学习
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warnjng - yellow sign with triangular band
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开始学习
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information - rectangular
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safety limits of steady electric current 开始学习
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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 开始学习
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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 开始学习
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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 开始学习
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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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