Introduction to Electrical Engineering

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........................................5.............2 Protection against indirect contact................................68 7.............2...64 6..................3..................................................................................................8 Protection against fault currents........65 6......................1 Erection..................69 7...................................................... Proper installation protective conductor .................2....................................................60 6.......3 Colours actuators...... VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION.................1 PEN conductor...........................3..............................................................................................62 6.................CONTENTS 5 6....................................................................................................60 6................................65 6........................................................................................3....................................................................................................................... Coding indicating devices and actuators colours (IEC 73).......4...3............................................................ Testing.................................74 8...........3..68 7........4.3 Nature demand.........................................4......................... Proper installation electrical equipment.........................4............4....................................................................................................62 6...........................................................2 Type wiring and methods installation ................................................................85 ............................60 6.................................1......................4 Selection electrical equipment..................................................4.....................................70 7...........................................................74 7.............................................58 6...............58 6............................13 Prevention mutual influence...84 9.84 9.......................................................72 7........................................................... Climate ................... Identification conductors and terminals.......................................5 Examples safety signs................1.......82 9..............64 6........64 6....................................................................10 Disconnecting devices .....................................................4.............72 7........3..........64 6...............................5 Characteristics................4...................2 Example use safety colours and contrast colours..........5............ SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT ..................4..........................3 Terminals for protective conductors ...................................................4.............1 Safety colours..................................64 6...........................66 7.......4.............................................. Safety information electrical equipment and devices..........................1......................................................9 Protection against overvoltage.4....63 6....................................67 7..................................6 Cross-section conductors...3....................................................... EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ............................2 Marking actuators....................84 9.................................................................................................................4.......71 7..... General ......58 6...........3........1 Protection against thermal effects.... Selection and erection electrical equipment according external influences ..............3....................................................64 6....................................................................................................1 Indicating devices ......4 Safety signs .........4.70 7.79 8..................................5............4.........................................................1.2 Preservation electrical continuity protective conductors...........................................................................62 6.....................2....61 6...............................61 6........................61 6...................................................................65 6..............4..........................................................7 Protection against overcurrent .....................................................................................................1................................65 6.....67 7.....4....4.....1 Protection against direct contact...12 Conditions installation........ Visual inspection.............3........................... Graphical symbols for use electrical equipment .............14 Accessibility electrical equipment..................................................2......................3..........69 7........11 Emergency control .......2 Initial verification......... Erection and initial verification electrical installations............3 Geometric form and meaning safety signs .....................4...........................76 8............................2.................................................................................................................................................................

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