Introduction to Electrical Engineering

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.................................................. Climate .4..84 9...8 Protection against fault currents........66 7................................................7 Protection against overcurrent ..................................................2.................................................................................................5..............................................68 7..2.........................................4.................................................................................................................................4.....................6 Cross-section conductors.........70 7.4.........................58 6...................76 8....................... VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION.............9 Protection against overvoltage............4...... EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ........1....................................................3..........................58 6................................................1...........................................5 Characteristics......................4...................72 7.65 6......................................4 Safety signs .........64 6.......................................................................64 6..............................................5 Examples safety signs.......................2 Preservation electrical continuity protective conductors........................................67 7....................................................4.......................... Coding indicating devices and actuators colours (IEC 73).........2 Protection against indirect contact.......................64 6...................................................68 7.............................................4............................3................................................3.................3...... General .........................72 7..............67 7.3 Colours actuators.................................3....................64 6......62 6...........................................................2 Initial verification............................70 7..............1......................... Erection and initial verification electrical installations......................65 6.........................4..................................................................1 Protection against thermal effects........................................ Visual inspection.......................5.................................... Safety information electrical equipment and devices...............................................60 6...................................60 6..........................3.............4..2......................3 Terminals for protective conductors .........................................................1 PEN conductor....3.............69 7....................4 Selection electrical equipment......1 Safety colours......85 ..........................................................................................................................64 6............................................2.........11 Emergency control ..................................................................................................................................63 6.....CONTENTS 5 6.................................................. SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT ......................................... Graphical symbols for use electrical equipment ...............3 Nature demand..............................4.................................1.................................................4...14 Accessibility electrical equipment....................................................................................................3....................................................60 6.........................................12 Conditions installation................................1 Indicating devices ....3..................10 Disconnecting devices .......4..............61 6.........................................................2 Marking actuators.........61 6.......62 6...........................1 Erection.........................................5.......2....4.................65 6........84 9..................74 8..................................13 Prevention mutual influence............ Proper installation protective conductor ...........................................4.........71 7..........................................................2 Type wiring and methods installation .82 9.......................65 6...............................3 Geometric form and meaning safety signs ......................... Identification conductors and terminals....................................84 9...................4............................69 7......................62 6............................................... Testing.............4...................................................2 Example use safety colours and contrast colours...................................................................3.....74 7..4...................................................................................................3...79 8............1 Protection against direct contact........................................................................... Selection and erection electrical equipment according external influences ................ Proper installation electrical equipment.....61 6.1.......................58 6...............64 6..................................................................................4.................

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