Introduction to Electrical Engineering

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............4...4......3 Geometric form and meaning safety signs .................3...................................64 6................................................................................................................................................ Visual inspection..........................................................................1 Indicating devices ......2 Type wiring and methods installation ...........3.........2 Initial verification.......................61 6................3...............2.............................6 Cross-section conductors.......................................4..........84 9...............................................58 6.......8 Protection against fault currents..........................74 8........................5..68 7............................................................79 8.....................................................................4 Selection electrical equipment...........63 6.........................1..............3................................................................................67 7.........1 Erection..........76 8.........................................2 Preservation electrical continuity protective conductors... EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ............................................................4......84 9........................................................................... Coding indicating devices and actuators colours (IEC 73)................................................................................................2 Marking actuators.........................................................................4...... Climate .72 7........................... General .......4.......3 Colours actuators.........................................4................5 Characteristics.......................................3.............. VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION.................................72 7.......9 Protection against overvoltage.......................................... Proper installation protective conductor ...............................................................4............14 Accessibility electrical equipment..............................69 7...................3 Terminals for protective conductors ..................................4....................................................................................................5............................................3...................................4............1 Protection against direct contact.....................................3..60 6.......70 7..............4.............................................................................................84 9.......1 Safety colours......................10 Disconnecting devices ..............................................................2 Protection against indirect contact...............64 6....... Safety information electrical equipment and devices........................................................................................61 6.4......60 6.....2.........................................74 7......................60 6..3.....4......................1 Protection against thermal effects...1.............65 6............................................................4 Safety signs ............. SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT .........2............4...............CONTENTS 5 6..............................................62 6................................................................65 6.........66 7........................................................................................................... Testing.................................64 6.......2............................5............................................ Graphical symbols for use electrical equipment .........5 Examples safety signs.........................4.............64 6.........62 6.....85 ...............64 6....................................................................................................82 9......................................69 7..............................................4...........1...................................................3 Nature demand.............................. Proper installation electrical equipment................................. Identification conductors and terminals........ Selection and erection electrical equipment according external influences ...68 7..........................................................1..................................................4.........................................4..... Erection and initial verification electrical installations...........................67 7...............4........2 Example use safety colours and contrast colours........7 Protection against overcurrent ...........................................................65 6...........................................64 6........................................................................................58 6.....................................................1....12 Conditions installation...2...................................................62 6.....61 6.............3...............................................58 6.................3.........................3.....71 7.....................................13 Prevention mutual influence...................65 6...70 7....................................................................................................................................11 Emergency control ....1 PEN conductor

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