Introduction to Electrical Engineering

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....................................................60 6.........................4.84 9...........62 6..................................................................68 7.............66 7.71 7.......64 6...............65 6. Climate .............................................................79 8..14 Accessibility electrical equipment.........................................61 6...................................................................................................72 7...........................4.........70 7......................4 Selection electrical equipment.....................................................................65 6................1 Safety colours.......................................................................1 PEN conductor............................4..............3............85 ...........2............84 9........4 Safety signs ............................................................................... Safety information electrical equipment and devices.... Coding indicating devices and actuators colours (IEC 73)........ Identification conductors and terminals.5.11 Emergency control ....................................................................................4.................................2 Protection against indirect contact.............................3..........................................4.................................... SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT ..................................64 6............................................76 8................................1 Erection...13 Prevention mutual influence...............................................................2.......63 6.................. Erection and initial verification electrical installations.....64 6..3 Nature demand..............................................................5.2.............2 Initial verification.............................................................................................12 Conditions installation..............69 7.9 Protection against overvoltage..............................61 6................................................................4...............................3......................................................69 7. Proper installation electrical equipment.....................4........58 6....68 7...........60 6....... General ..............................................................1 Indicating devices .......................61 6..................5 Characteristics... Proper installation protective conductor .............................................. Visual inspection....58 6....................................................3...................................................................................................................3 Terminals for protective conductors ..............................................................1.....................................2............................................................................10 Disconnecting devices ...............................4..............................................62 6.................................................................................................2 Preservation electrical continuity protective conductors........................................2 Marking actuators............74 8.............4............................................4............ Graphical symbols for use electrical equipment .....................................65 6.3............... EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION .....................................4........................................... VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION...................................................................................................1.........................1 Protection against direct contact................................... Selection and erection electrical equipment according external influences ...2 Type wiring and methods installation .............................................................................64 6............74 7............................1 Protection against thermal effects........7 Protection against overcurrent ........................................................................................4......................................................................................................... Testing...................................67 7.............................64 6..............2 Example use safety colours and contrast colours..............60 6..64 6................................4....3 Geometric form and meaning safety signs ...........................72 7....1.................4....................1....................................3...................3...5 Examples safety signs...................4......62 6...................................3 Colours actuators..................................................................4....................3............4....................................................5...........6 Cross-section conductors..............................84 9.........................................................58 6...............................3.70 7..2................65 6.......8 Protection against fault currents......................................................4................3.........................3.......................82 9..........67 7......................................1..........4......CONTENTS 5 6......................................................................

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