Introduction to Electrical Engineering

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............................64 6..................................................85 ...............................58 6.................1 Protection against direct contact..........................................3............................69 7..................4..................................7 Protection against overcurrent ..............................6 Cross-section conductors............1 Erection.................................................5.4......72 7...........10 Disconnecting devices .....................60 6..........84 9........4...........................66 7................61 6....................3..........................3...84 9...........................................3.12 Conditions installation....68 7..............14 Accessibility electrical equipment......2 Type wiring and methods installation ..........................................................3........................3 Nature demand.............67 7........................64 6....................................................2....... Selection and erection electrical equipment according external influences ....2 Initial verification..........11 Emergency control ...3..........................4.......................................................58 6.............................................. Testing...............................................................60 6......................................................................................62 6.........1 Indicating devices ........................................................... Proper installation protective conductor .58 6..5 Characteristics...............4.......................5.................................4.................3 Geometric form and meaning safety signs ..... VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION.................................................1 PEN conductor..........................74 7....................................................................................71 7..CONTENTS 5 6.................4................... Safety information electrical equipment and devices.............................1...................................................................................................................................................................................... Identification conductors and terminals.......64 6..............................................................................................................4...........................................................................63 6...84 9....... Erection and initial verification electrical installations.................................4.........62 6..................2.............65 6.............64 6....4 Safety signs ..................13 Prevention mutual influence............4....................................................65 6..82 9.........3...........................70 7....................................64 6...........................1..............2 Marking actuators...............2 Example use safety colours and contrast colours................................4...........60 6............................................................. Proper installation electrical equipment......... Graphical symbols for use electrical equipment ....4.....................................................................79 8.........................4..............1.................64 6.............2..........................8 Protection against fault currents..............72 7...........................................................................1.........................................................................................................................4...................1 Safety colours........... Climate ........................................ General .......................62 6.......65 6..............................................................2.......3...............4..................................................1 Protection against thermal effects............................................................5............................. Coding indicating devices and actuators colours (IEC 73)..................9 Protection against overvoltage............................................................61 6........61 6...........3............70 7......3......3 Colours actuators.................2 Preservation electrical continuity protective conductors.4.......................69 7.............................3......................3 Terminals for protective conductors ..........................4...........2...............................................................68 7..............................................................4.............................................. Visual inspection...............................................................67 7...................4 Selection electrical equipment...........1........................................................................................................................................................................74 8................. EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ..............................................................................................................................2 Protection against indirect contact........................................4.......................................5 Examples safety signs... SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT .......................65 6...........................................................76 8.......

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