Introduction to Electrical Engineering

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......................1 Indicating devices .....5....1 PEN conductor.................. Climate ....................11 Emergency control .......................9 Protection against overvoltage....................4..69 7........3 Colours actuators....................................................................................................................................................... SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT .................................................2 Marking actuators.................65 6...............2.....1.........10 Disconnecting devices ............................................2.76 8............................................14 Accessibility electrical equipment...................65 6..............3......................3 Nature demand................60 6.................4.......3...1................................................ General ...........................68 7..................................................... Erection and initial verification electrical installations..........74 7..........4..............4 Selection electrical equipment.....3 Terminals for protective conductors ........6 Cross-section conductors................67 7................62 6.................60 6........................................4.......................64 6....... Proper installation protective conductor .............................4................................4...............4 Safety signs ..58 6.....2 Protection against indirect contact............60 6.................................5 Characteristics............85 ...................................................................................................................................................13 Prevention mutual influence.....................................................................1......3 Geometric form and meaning safety signs ...............................3.....71 7.................................................................1 Protection against thermal effects............................................................4............79 8......................................... Selection and erection electrical equipment according external influences .74 8............4... Proper installation electrical equipment............3...............2.................64 6.....................................................7 Protection against overcurrent ..........4...... Safety information electrical equipment and devices..................4..............................................................................................58 6...................................................................................................4............................3..............64 6.........................................................67 7........................................4.........3..........3.................................1................................................ Identification conductors and terminals.......................2 Type wiring and methods installation ...................61 6..5 Examples safety signs.................................................66 7........................63 6...........................................84 9........... Testing.................72 7.............................................. EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ............1 Safety colours..............................61 6...........................2 Initial verification....................................61 6...............................8 Protection against fault currents..................................................................................1 Protection against direct contact..................3.......................64 6......................4...4.............................................................................................................................................................2......................................1 Erection.......65 6...................................4.....................62 6....84 9............................4...........................58 6.............................................64 6.............................................................84 9.................62 6......................................................68 7.............70 7...............................................................................................................................2 Example use safety colours and contrast colours.............. Graphical symbols for use electrical equipment ..............70 7............................................................................................64 6........................................................4.5.................................................65 6.3................................4..................5..................................................1........................................82 9.........................2 Preservation electrical continuity protective conductors....12 Conditions installation......................................................... Coding indicating devices and actuators colours (IEC 73).........................CONTENTS 5 6.. Visual inspection.............................................................................69 7.................................................................3............................ VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION........................4.............2..........3...............................72 7.............................

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