Introduction to Electrical Engineering

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....................4.......3 Geometric form and meaning safety signs ..........................65 6............................5 Examples safety signs............4.................................................... Erection and initial verification electrical installations................................................................79 8..........................3.......................................................4........................................3..........8 Protection against fault currents....................................................................5........................................................................................................65 6.............4 Selection electrical equipment....................................... Visual inspection............................................................................4.................. Graphical symbols for use electrical equipment ...................9 Protection against overvoltage....................64 6...................4..............................61 6..1......................2................................2 Type wiring and methods installation ............................................................................................................................................................................5 Characteristics.....................6 Cross-section conductors....67 7..3....2.......................................74 7...........3...........................................CONTENTS 5 6...........69 7......................................................................2 Initial verification.4.........................................64 6...1................74 8............................................................................................................62 6....................................4...... Proper installation electrical equipment..67 7............76 8..................58 6....................................... Climate ...61 6..........14 Accessibility electrical equipment............................................................................................. Coding indicating devices and actuators colours (IEC 73)..........2 Marking actuators..............................................4........12 Conditions installation....63 6......................84 9.......................68 7.....................72 7..................................2.60 6.............................10 Disconnecting devices ................... Proper installation protective conductor ........1 Protection against thermal effects....................................1.........................................................70 7...4...................4.............................4.........................................................................1.....4........71 7................................................................................... General ...1.........................................62 6.....................65 6.................1 Safety colours......64 6.................4..........1 PEN conductor.......................................3......................................65 6.................4. Selection and erection electrical equipment according external influences .............................................................58 6..............................................................................62 6..85 .............3..............................................84 9...............4......................................................................3.......................................................1 Indicating devices ................60 6.......................................... EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ..64 6....... SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT .................................................................................................................................. VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION.......2.......................................................3........................................................................................ Safety information electrical equipment and devices..82 9..........................................68 7......2 Preservation electrical continuity protective conductors............11 Emergency control ...................58 6..............3.....................1 Erection..............................................4..............66 7.......................................................................................................5....................................84 9...................4.............................3 Terminals for protective conductors .......................................................................... Identification conductors and terminals.......................7 Protection against overcurrent ........................................................60 6.........2........64 6..........................2 Protection against indirect contact....................................72 7.3...................64 6..69 7.........................................3 Colours actuators...................61 6..........................1 Protection against direct contact..4...................................................................................4..............4 Safety signs .......5..................3 Nature demand...70 7............................3............13 Prevention mutual influence................ Testing.....................2 Example use safety colours and contrast colours....

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