Introduction to Electrical Engineering

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...................................................................................................................................3............................................4........................7 Protection against overcurrent ................ Graphical symbols for use electrical equipment .....69 7................71 7...........................................1 Erection............4.....................60 6................................................... General ................11 Emergency control ...................74 7.......................................................................62 6.......................................4.3 Nature demand................. Safety information electrical equipment and devices...............................................61 6..........................4..............................3 Colours actuators................................................................74 8.....................13 Prevention mutual influence.....................................................58 6...................................1..................................................................................3.............64 6............................................................................................................4...........................................................................58 6....79 8..........................................................66 7.............................................65 6................................................1..................3..................... Proper installation electrical equipment..................................63 6.......................................................... VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION..3...4...........85 ................................................3......68 7.4...................9 Protection against overvoltage...................................84 9..........................................4.......... Visual inspection..................................................... Proper installation protective conductor ....................................................................................... Selection and erection electrical equipment according external influences ...2 Preservation electrical continuity protective conductors.......68 7..CONTENTS 5 6...................................................................2 Type wiring and methods installation ...................67 7...............................................3...2..... Climate .......................................64 6............................................................................5..............................................4.........................64 6...................1....................................................................12 Conditions installation................64 6.............................................5...........70 7.........................4........................................3.......3...............................................3................4...........1.....................60 6..................................61 6..............................65 6...........................3..............58 6..........................................70 7.........................................................................................................................82 9...................................76 8...............................................................2.....................72 7...............4.8 Protection against fault currents.........67 7........................ Identification conductors and terminals............. Erection and initial verification electrical installations...............................6 Cross-section conductors...................................5 Examples safety signs...................64 6.................................. SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT .......4..........14 Accessibility electrical equipment............ Testing.............................................................................................................1..................65 6..................4 Selection electrical equipment.........4..........69 7..1 Protection against direct contact........................4............................................2....... EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ..................1 PEN conductor.......................................2 Marking actuators.......................72 7...................2 Initial verification..64 6.................10 Disconnecting devices ...........................2 Protection against indirect contact........................62 6... Coding indicating devices and actuators colours (IEC 73)...........4.......................................................2..................4..5.......5 Characteristics..................84 9.......................65 6.............................................................................3.....3 Geometric form and meaning safety signs ...........................................................61 6......................................................................2...........................1 Indicating devices .................60 6........2 Example use safety colours and contrast colours.......................84 9...........62 6..............4.....3 Terminals for protective conductors ..1 Protection against thermal effects.....4.......................................................................4 Safety signs ...........................1 Safety colours

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