Introduction to Electrical Engineering

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.........67 7.........................................2 Example use safety colours and contrast colours... VERIFICATION ELECTRICAL EQUIPMENT AND INSTALLATION.........................85 ......65 6.................5..................72 7.....................................................................................82 9.....................................................................................................................................................................................................2................4..................5 Examples safety signs...............................4.................64 6... Selection and erection electrical equipment according external influences .........70 7.........................................................................13 Prevention mutual influence......... Testing............. EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION ........................3......8 Protection against fault currents.................................7 Protection against overcurrent ..64 6....................... Graphical symbols for use electrical equipment .........79 8......................................................................................................................................................................... Proper installation electrical equipment..............................60 6.................................................3 Colours actuators..... Visual inspection..........62 6......................4..68 7.74 7.......................................................3.......................2......6 Cross-section conductors......14 Accessibility electrical equipment....3......................70 7.................................. General ....................................................................................4.74 8...............61 6.......... Proper installation protective conductor ..............................................................................61 6...........................................................64 6.............................................................................................................................................1 PEN conductor.....2 Protection against indirect contact..................5..........................3....................10 Disconnecting devices .............2 Marking actuators...............68 7....................................2........3..................................4........................................4.....................................66 7...........4........................3 Geometric form and meaning safety signs .........................................................................................................................64 6.......65 6......................................................1......................................60 6.......4............................................11 Emergency control ............4............69 7.............................................................1..................84 9..................67 7........................60 6................................................1 Safety colours..63 6......71 7......................................65 6....................................3....58 6................................2...............................CONTENTS 5 6.......... Safety information electrical equipment and devices.................................................. Erection and initial verification electrical installations.. SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT ...........................62 6..............84 9..58 6....................4...1 Protection against direct contact......................................64 6...........61 6....... Identification conductors and terminals........3.........................................................4...............9 Protection against overvoltage.......................................................................5..............................3....................3.....................................................................................................84 9.................................. Climate ..4 Safety signs .....................................................4.........................................................................................3...............................2 Type wiring and methods installation ..........................65 6...................5 Characteristics...........................64 6..............................................................2 Preservation electrical continuity protective conductors.......4......................................................3 Nature demand......62 6......4.....3 Terminals for protective conductors ....72 7..4 Selection electrical equipment..............................2 Initial verification..........................................................58 6................................................................... Coding indicating devices and actuators colours (IEC 73)......2........................1.....................................................................1 Indicating devices ..............................1.................4..............................12 Conditions installation...................76 8......1..4........................4.......1 Protection against thermal effects..................................................4.................................69 7...........1 Erection...................................3............................4.........................................

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