27-04 Power supply devices

27-06 Cable, wire

27-13 Protection installation, device (electric)

27-14 Electrical installation, device

27-18 Electrical cabinet, housing, rack

27-21 Signal processing

27-24 Control, Process Control System (PCS)

27-26 Component (electronic)

27-28 Identification

27-37 Low-voltage switch technology

27-40 Electrical insulation and connecting material

27-42 Electronic coil and filter

27-43 Cable, pipe, hose laying (electric installation)

27-44 Connector system

27-46 PCB connection technology