Introduction to Electrical Engineering

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

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