Introduction to Electrical Engineering

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...........................................................84 9.............................................................5.........3 Geometric form and meaning safety signs ................2 Example use safety colours and contrast colours.......................1 PEN conductor..............................................64 6..............................................4............84 9.................4.................................... General ..............5...........4..........................................................................70 7............3...............1 Safety colours...................3 Colours actuators.......................3 Terminals for protective conductors ...................61 6..............3.................74 8.......................1..................................................................... SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT ...................................58 6.........................................................71 7................................................... Selection and erection electrical equipment according external influences ...........................4.....4..62 6..............2 Protection against indirect contact.4.....................................................62 6.................................................. VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION..67 7.....................82 9...............64 6.1 Protection against thermal effects....................................................................................................................1.............................................5..............................4............................................................................................65 6........4.......................................72 7.......................................................................................... Erection and initial verification electrical installations...............................4..................................... Graphical symbols for use electrical equipment ........................4..................8 Protection against fault currents....................................................70 7.9 Protection against overvoltage.................64 6.......85 .............................................64 6........................4 Selection electrical equipment...........63 6..............3...................4........................... Climate ............74 7..................................... Proper installation electrical equipment.............................1...............................................................64 6..................2........................................... Testing....2..72 7................................69 7.............CONTENTS 5 6.........................................................62 6.................................................................................61 6......1............13 Prevention mutual influence..............................................................................................68 7......................1 Protection against direct contact.......................................................................4 Safety signs ......................................14 Accessibility electrical equipment.....4......... Proper installation protective conductor ..........................................3..................................6 Cross-section conductors.............2 Type wiring and methods installation .................79 8................3........3 Nature demand.....3..61 6.............................65 6...............60 6.......76 8.....66 7.................... Identification conductors and terminals..............................................................................58 6.....4......................1 Erection.......60 6.4............................................................2.............................................................3..60 6........................................................................................7 Protection against overcurrent ......................3..............................3...2....67 7........................3...........4...............................................................................1..............65 6............................................58 6....................................................................................................4...................................2 Initial verification......2 Marking actuators.4.......2 Preservation electrical continuity protective conductors..........11 Emergency control ................................................2.............5 Characteristics....................................................64 6.......................................................65 6................84 9... Coding indicating devices and actuators colours (IEC 73)...............10 Disconnecting devices ................................69 7..........................12 Conditions installation.................................................3...............................................68 7..............................4............................ Visual inspection.................................................................................................... Safety information electrical equipment and devices................... EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ......................................................5 Examples safety signs..................4..............1 Indicating devices ...

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