Introduction to Electrical Engineering

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.............4......4...............4................................................. Erection and initial verification electrical installations.......13 Prevention mutual influence.1 Indicating devices ......4 Selection electrical equipment......................................2............ Visual inspection..............66 7...........................4..........................................................................................................61 6........................72 7.....................................................................................64 6..................................................................4.....................................................................68 7...4 Safety signs .....68 7...........................................................62 6.............................................. Safety information electrical equipment and devices.3...............5 Examples safety signs..............................................................61 6..................4........................................................................4........................................................................................8 Protection against fault currents..............85 ..2 Marking actuators...65 6....................................................................................................2 Example use safety colours and contrast colours..........................64 6.........................................................................3..........................2 Preservation electrical continuity protective conductors......2 Initial verification..4............60 6......................7 Protection against overcurrent ........................................60 6.......14 Accessibility electrical equipment...................................................................5.............................67 7.......................65 6................58 6..............3 Terminals for protective conductors .3.......................... Coding indicating devices and actuators colours (IEC 73).......................................................................70 7... Proper installation protective conductor ..........................60 6...................... Climate ............................................................3...................71 7..................................................................................................67 7................1......64 6.............3 Colours actuators....................2 Type wiring and methods installation .......................................1 Protection against direct contact...............74 7..............1................62 6...................................................................................6 Cross-section conductors......................................... Testing........61 6..........4.................................................................. SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT ........................................................ Proper installation electrical equipment..............3........4........................................69 7....................................................................................................84 9....................................................69 7.........................74 8.........2..................................................................5 Characteristics................3.......... General ........4.......64 6......84 9.. EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ............1..5.........................................................4...........................72 7.....................3 Geometric form and meaning safety signs ...................2 Protection against indirect contact..58 6.2......................58 6.................................................... Selection and erection electrical equipment according external influences ..........................11 Emergency control .2.....65 6...................................76 8.................................... Identification conductors and terminals.....................12 Conditions installation........CONTENTS 5 6...1.......................10 Disconnecting devices ............4..................................9 Protection against overvoltage..................................................................................................1 Safety colours......................63 6................3.........3............3............................84 9.... Graphical symbols for use electrical equipment ................................................................3...............64 6.............................................................................4........................4.............................................2.........1 PEN conductor...........................................................82 9.........1 Protection against thermal effects..........64 6..................................................4.....4.........62 6.............................4...4...................... VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION.............................................................................................................1 Erection........1............................5.......79 8........65 6.............3........................................................................................................................................................3 Nature demand.....................................................70 7................

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