Introduction to Electrical Engineering

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.....61 6........... Visual inspection.................79 8..................................................................................... Climate .............3 Nature demand.........................................................1......... EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ............................4..........3...........2...............................1..........................................................62 6...... VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION..........................................................................................2 Marking actuators..............................72 7........3...................................10 Disconnecting devices ..............................3.............................................................................................................1 Protection against thermal effects...........................................................................4...........14 Accessibility electrical equipment.....................................................................................1 Indicating devices ........4...4..........64 6..................1 Erection..........65 6.11 Emergency control ........58 6.....................................................................61 6................................................................65 6...........................4.1.......................................................... SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT .............................. Proper installation protective conductor ......2 Type wiring and methods installation .............................4.........3. Erection and initial verification electrical installations................74 7...............................................................................................................60 6.............5..........................2.....................13 Prevention mutual influence...............................................84 9.............................................. Proper installation electrical equipment..2 Example use safety colours and contrast colours... Safety information electrical equipment and devices.....................................................................................1 Protection against direct contact.......................................82 9................................................1......4....................................................................................2 Initial verification..........................58 6............................................................................CONTENTS 5 6................68 7......60 6... Selection and erection electrical equipment according external influences ..........................................3................68 7...........7 Protection against overcurrent ......3.......................................64 6................... Testing..........69 7...........................8 Protection against fault currents...........................................58 6.......... Coding indicating devices and actuators colours (IEC 73)...........................2 Preservation electrical continuity protective conductors.........4........................................2 Protection against indirect contact........4.........3..............................................................................4.........61 6......1..65 6..5....2.......................3 Geometric form and meaning safety signs .................3.......................................................................................................................................64 6.....................................................65 6........4....................9 Protection against overvoltage.........................6 Cross-section conductors..4.....................................85 ............................5 Characteristics...............................................62 6..........67 7....................3 Colours actuators...................84 9.4.........................................................................70 7..................................................................................64 6....................4...................3.........................72 7............................................................................62 6.......... General ............1 PEN conductor..........................5....................70 7......4 Safety signs ...........................................................................................67 7. Graphical symbols for use electrical equipment ..................84 9...74 8.........................1 Safety colours.....3.........4......................71 7......................................................................................................4 Selection electrical equipment............64 6....................................................66 7................3...............................................2.........................................4.....................63 6.......................................2..............................................5 Examples safety signs.........................................................................................4................ Identification conductors and terminals...........................................76 8........64 6......................12 Conditions installation.......................................4..................69 7......4............................60 6....3 Terminals for protective conductors ...................

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