Introduction to Electrical Engineering

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.4............4..3 Colours actuators..........................................4...................................................3......................................2 Protection against indirect contact...................... Selection and erection electrical equipment according external influences ..2........6 Cross-section conductors...............................2 Marking actuators........1.......................................................................................................................................71 7...68 7......14 Accessibility electrical equipment..............................................1 Indicating devices ............................................................64 6........84 9......65 6.............................64 6...84 9............ Safety information electrical equipment and devices..............................................................................70 7..............10 Disconnecting devices .......................61 6......3............................ Proper installation electrical equipment................................ Erection and initial verification electrical installations.....61 6......................... Climate .60 6....................79 8....................58 6.......74 8...............65 6..................................................................................................................... SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT .........................................................................................................................................................................72 7.....................................64 6........................ Visual inspection..............................3.................................................3.........................................58 6...................................67 7...............................4..........76 8........3...4..............2...70 7......................................5 Examples safety signs................. EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ...............4.........................................................................3 Nature demand.4.... General ......................................2 Type wiring and methods installation .....................................................................................................................67 7....................................68 7......................................................61 6..............................5.......1.............. VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION...................84 9....................4.....................................................9 Protection against overvoltage...........3............................................3.................................5 Characteristics.....66 7...................... Identification conductors and terminals.3......62 6........................................................................................ Coding indicating devices and actuators colours (IEC 73)...................................4 Selection electrical equipment.......................................1 PEN conductor..........................72 7.64 6..............................................................................4 Safety signs .... Testing...........................................................4..4....................................3 Terminals for protective conductors ..........2.....8 Protection against fault currents...........2....................85 ...........4.........4......................60 6...............4....................1 Erection........................................3.................................. Graphical symbols for use electrical equipment ......2...................................................69 7....................4........................................................................................63 6.........................62 6.......................... Proper installation protective conductor .......................................................................5.....................................................................................4...............................................................................1 Protection against thermal effects....................7 Protection against overcurrent ..............................3...................65 6.................................60 6.............................................................................................12 Conditions installation.......3 Geometric form and meaning safety signs .......................CONTENTS 5 6.2 Example use safety colours and contrast colours.........69 7....1 Protection against direct contact..............................1..................2 Initial verification.......................2 Preservation electrical continuity protective conductors.....1 Safety colours......................................4......................................................................................................................................4..13 Prevention mutual influence..............................................................1..65 6..............................................................4...........64 6......3....................5.....................1......4.................................................58 6.................64 6.................................................................74 7...............................11 Emergency control ..................62 6.82 9.........

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