Table of contents 6 Electrical equipment ................................................................................................................................ 81 6.1 Interface agreements between customer and manufacturer ................................................. 81 6.2 Incoming supply conductor termination and supply disconnecting device ............................ 82 6.2.1 Incoming supply conductor termination ................................................................................. 82 6.2.2 Supply disconnecting (isolating) device .................................................................................
86 6.2.3 Excepted circuits .................................................................................................................... 93 6.2.4 Devices for removal of power for prevention of unexpected start-up .................................... 95 6.2.5 Devices for isolating electrical equipment .............................................................................. 98 6.2.6 Protection against unauthorized, inadvertent and/or mistaken connection ........................... 99 6.3 Protection against electric shock .........................................................................................
101 6.3.1 Basic protection .................................................................................................................... 102 6.3.2 Fault protection .................................................................................................................... 110 6.3.3 Protection by PELV (protective extra-low voltage) .............................................................. 117 6.4 Design and protection of equipment .................................................................................... 118 6.4.1 Overcurrent protection .........................................................................................................
119 6.4.1.1 Arrangement of overcurrent protective devices ................................................................... 121 6.4.1.2 Initial symmetrical short-circuit current ................................................................................ 127 6.4.1.3 Selection of overcurrent protective devices ......................................................................... 133 6.4.1.4 Selection of control devices ................................................................................................. 135 6.4.1.5 Conductor dimensioning ......................................................................................................
139 6.4.1.6 Practical example ................................................................................................................. 147 6.4.1.7 Control circuit ....................................................................................................................... 153 6.4.2 Protection of motors against overheating ............................................................................ 154 6.4.3 Protection against abnormal temperatures ..........................................................................
156 6.4.4 Protection against the effects of supply interruption or voltage dip followed by voltage recovery ............................................................................................................................... 156 6.4.5 Motor overspeed protection ................................................................................................. 156 6.4.6 Ground fault/residual current protection .............................................................................. 156 6.4.7 Phase sequence monitoring ................................................................................................
157 6.4.8 Protection against overvoltages due to lightning and to switching surges .......................... 157 6.5 Equipotential bonding .......................................................................................................... 158 6.5.1 Protective bonding ............................................................................................................... 158 6.5.2 Functional bonding ............................................................................................................... 168 6.6 Conductors and cables ........................................................................................................
169 6.6.1 Classification ........................................................................................................................ 169 6.6.2 Conductor types ................................................................................................................... 171 6.6.3 Selection criteria................................................................................................................... 174 6.7 Warning signs and markings ................................................................................................
176 6.7.1 Functional identification ....................................................................................................... 178 6.7.2 Marking of equipment .......................................................................................................... 179 6.8 Wiring practices .................................................................................................................... 183 6.8.1 Identification of cables ......................................................................................................... 189 6.8.2 Wiring inside control panels .................................................................................................
192 6.9 Testing and verifications ...................................................................................................... 194 6.9.1 Requirements of IEC 60204-1 ............................................................................................. 195 6.9.1.1 Visual inspection (mandatory) .............................................................................................. 195 6.9.1.2 Verification of conditions for protection by automatic disconnection of supply (mandatory) ..........................................................................................................................
195 Control Panels compliant with IEC Standards and European Directives 8 Reference Manual, 10/2017, A5E38284819002A/RS-AB/002