Introduction to Electrical Engineering

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....61 6...................................60 6...................62 6..4......4.....................................2........64 6..........CONTENTS 5 6....................61 6.............7 Protection against overcurrent ..............................................................5.......3................................. Proper installation protective conductor ..........................65 6..............................................................................58 6....................................4 Safety signs ..................4.............69 7............................ General .......................................... Coding indicating devices and actuators colours (IEC 73).................. Identification conductors and terminals.....4.......................................................................................................................4..62 6.....................64 6.................4...................3 Colours actuators...............................................................71 7....................72 7.................................84 9.............................................. Erection and initial verification electrical installations................64 6.................................4....4.......................................................................2 Preservation electrical continuity protective conductors...........................70 7...................2 Marking actuators.1 Indicating devices .............3.......4...58 6......................................................................2 Initial verification......................... SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT .................................................................................3.......................................................1 Protection against thermal effects...................1.......................................... Climate .................5...................................5 Characteristics.....................68 7...........................................................................................1 Safety colours.....67 7.............4.......................... Proper installation electrical equipment...........65 6............................................................................................................................................1........1 Erection....................................... Graphical symbols for use electrical equipment ................................1...74 8.........................5...4..................................................................................................3..........................................2 Type wiring and methods installation ......................2 Example use safety colours and contrast colours................................72 7....58 6...10 Disconnecting devices ................................................8 Protection against fault currents.....65 6..3.......3.. VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION...........85 ...................82 9......2.........2.........................................64 6..4..........................................................................4.....................................4..........2..60 6......61 6........................................................................65 6........................................1....................63 6..............................1 PEN conductor...............................64 6.................................................62 6.74 7................64 6........................................................................................................2.............................................70 7.......................4........................................................................................ Selection and erection electrical equipment according external influences ......66 7..13 Prevention mutual influence..............................11 Emergency control ........................79 8..6 Cross-section conductors.................................1 Protection against direct contact....................................................................................................................4................................4 Selection electrical equipment..............2 Protection against indirect contact...........................................3....67 7..9 Protection against overvoltage.. Testing.................... Safety information electrical equipment and devices........................3.........4.........................84 9............3.............................3 Geometric form and meaning safety signs ..............68 7. Visual inspection...........................12 Conditions installation................................................................................76 8.......................................3..............................4.......4.... EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ..5 Examples safety signs...........................................................................................................................................................................60 6..............................................................................................................................84 9.3 Terminals for protective conductors ....................1...........................................14 Accessibility electrical equipment............................3 Nature demand............................................................69 7.3..............

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