Introduction to Electrical Engineering

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.....................84 9.................................................4.....CONTENTS 5 6.........67 7............2..................................4.....................64 6................62 6........................3...........58 6................................................................................ Erection and initial verification electrical installations......4............................................................76 8...........70 7.....................................................4................... Climate ..................................................3 Nature demand....4....................................60 6............3 Geometric form and meaning safety signs ....................................69 7..................................................................................3................................................................................................5.............71 7. VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION.....................................................................................................62 6.3.............4....70 7.85 ........8 Protection against fault currents........4................................................64 6.......................58 6..4.................2....................4.3........................4........................13 Prevention mutual influence........... General ...............3 Terminals for protective conductors ........84 9..................................64 6.....64 6.....................................4........1 Safety colours.................72 7.......3..........................................................................3...............10 Disconnecting devices ................................................69 7.......................................72 7.............................................64 6......4..............12 Conditions installation......3.....2 Marking actuators......3...................................................... Safety information electrical equipment and devices................................................6 Cross-section conductors..........5..1........................5 Characteristics.......................................4...................................1 Indicating devices .............1 PEN conductor................5.............................................. Selection and erection electrical equipment according external influences .82 9....................................................................................2 Example use safety colours and contrast colours..................................................11 Emergency control ..........3......2..........1 Erection........................61 6............................................................... Coding indicating devices and actuators colours (IEC 73)....................................... Graphical symbols for use electrical equipment ...............5 Examples safety signs...79 8.................................................................... Visual inspection........ Testing............................................................................ Proper installation electrical equipment.........................14 Accessibility electrical equipment......................2 Initial verification................................................65 6.............................................................................................................66 7........62 6...............................64 6.....................2...........2 Type wiring and methods installation .............................................................................4 Safety signs ..........1............................................3................................................................................65 6..1 Protection against thermal effects.................................. Proper installation protective conductor ...................................61 6...68 7.......2 Preservation electrical continuity protective conductors.....................................1.1 Protection against direct contact...............................................................63 6............................................................................4 Selection electrical equipment................................................................................................................................74 8.............................. SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT ..........7 Protection against overcurrent ........58 6.......................................................65 6...............................................................................4................................74 7........................4......................................60 6.68 7............................................................................. Identification conductors and terminals..................................................4...........67 7........4.........................1......9 Protection against overvoltage......60 6................3 Colours actuators...............................65 6.....................2 Protection against indirect contact............................................84 9....................................................................1........61 6............................................3...........4.......2............ EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION .............4..........................................................................................................

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