Introduction to Electrical Engineering

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.................................4.........................................4........70 7...................................................71 7...................64 6.......7 Protection against overcurrent ........................................72 7...............................................................4.............. VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION..........................................................................2 Initial verification......3................................62 6.............................................72 7................................................................. Coding indicating devices and actuators colours (IEC 73)............58 6.................4 Selection electrical equipment.........................5 Characteristics..................................1...............................61 6..............................4....3...................5.......................................1 Erection............................8 Protection against fault currents..........................................................................................................................................................................13 Prevention mutual influence.........................................................4..................58 6.............................1 Protection against thermal effects..................................................1 Protection against direct contact........2 Marking actuators....................................10 Disconnecting devices ......3.......... Safety information electrical equipment and devices...4.................................................................3...........65 6............................58 6........64 6.........................................4.........................61 6..................1..................................4.....3...................................................................60 6.......... SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT .........................3..................74 7.............60 6.............................. Proper installation protective conductor ......................... Graphical symbols for use electrical equipment ...........................84 9.....11 Emergency control ...............69 7....................................................................67 7............................ EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION .84 9.......................................................... General ........................64 6.....................2 Preservation electrical continuity protective conductors.............................1 Safety colours.....3 Terminals for protective conductors ....5....................................................4......................................................4.........................................2..............3..............................................85 ..........................................................................................................................................4..................68 7........................68 7................................3............66 7....4............................................................... Proper installation electrical equipment.............................14 Accessibility electrical equipment.......1 Indicating devices .................65 6........62 6.......1...............................................................76 8..............................................67 7.................62 6...................................64 6..9 Protection against overvoltage..82 9... Selection and erection electrical equipment according external influences .............3 Geometric form and meaning safety signs ..4............................................3 Colours actuators.........................................................64 6................................63 6.4..................................................................................................2 Example use safety colours and contrast colours..........................69 7...............4.......60 6............................. Identification conductors and terminals.1..............................................................3... Testing............. Visual inspection.........................................1 PEN conductor...................64 6..........................5 Examples safety signs............3..................................2 Protection against indirect contact...................................................................12 Conditions installation....................................4.......................2 Type wiring and methods installation .................................65 6.................2..............3....................CONTENTS 5 6.........1............................................................... Climate ...................................................84 9.........................3 Nature demand..................................................................................65 6.70 7.............. Erection and initial verification electrical installations.............................74 8.......................................................61 6.......4.................2...................4 Safety signs .............................................4...................79 8.........................2...5..................................4....................6 Cross-section conductors............................2........................................................

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