Introduction to Electrical Engineering

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.....................2...........................................................................................................................12 Conditions installation.............................................1........3........................................................................ Erection and initial verification electrical installations...................66 7..................................4 Selection electrical equipment...........4...................................................................................4............................65 6......................1 Indicating devices .............................................5...............9 Protection against overvoltage........................................64 6.......... Safety information electrical equipment and devices............ Proper installation protective conductor .....................................................................................................1.......................................................................................2 Example use safety colours and contrast colours................................79 8................1....1 Protection against thermal effects........................................................................................................................5..................................................................3..........................60 6...................................... Identification conductors and terminals...... EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION .4.. Selection and erection electrical equipment according external influences ..............................4...1 Protection against direct contact.........................................................................................................................................72 7.............................4...1.....3 Geometric form and meaning safety signs ..............................84 9..............................5....63 6..................14 Accessibility electrical equipment.................................................................4..............3............................................64 6................ Testing..............................................82 9................84 9......74 7.69 7... Coding indicating devices and actuators colours (IEC 73)...................3..67 7.72 7...8 Protection against fault currents... Proper installation electrical equipment.......64 6...4.........................................5 Characteristics..........................4..3 Colours actuators....................71 7............58 6...4................................................................3....2..........60 6.....................62 6.....3...4..........................2 Preservation electrical continuity protective conductors...................4.......................................62 6...3..........................................................67 7..............3 Terminals for protective conductors ...........................................................................3................................................64 6.................................................13 Prevention mutual influence.......1 PEN conductor.................................................................................... SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT ............85 ...................................................4.........70 7............5 Examples safety signs............................3..............2 Initial verification..62 6..........1 Safety colours................................4........ Visual inspection........................................................7 Protection against overcurrent ................60 6...............4.....................................................3 Nature demand.. Graphical symbols for use electrical equipment ........................................................3................ General .................................................................................58 6...............................58 6........................65 6...........10 Disconnecting devices ..........................76 8.....................................................................................................................65 6.........4..................................... VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION......CONTENTS 5 6.......4...................................................84 9............................................................4...........................................................4 Safety signs ...................69 7...............61 6.4...2.........................................................................................................61 6.......................................................3..................64 6.....2.2 Type wiring and methods installation ...........................61 6..74 8..........1...68 7..............2 Marking actuators...............2 Protection against indirect contact........................................................................2.........................................68 7.....................................................64 6....... Climate ...................................4.........................1 Erection..11 Emergency control .......6 Cross-section conductors...............................................................70 7....................................................65 6..............................................................................................

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