In the Electrical - Scheme library the following symbols categories can be found:

- switchgear, control gear and protective devices (contacts, connectors, switches, disconnectors, coils and relays, selectors, fuses, others, discontinued standards),
- lighting (lamps, emergency lighting, others),
- measuring instruments (measures, meters, thermocouple, others, discontinued standards),
- production and conversion of electrical energy (engines, generators, transformers, current transformers, others - e.g. thermoelectric generators, rotary converters; discontinued standards),
- industrial automation and measurement (detectors and nozzles, meters and recorders, valves, actuators, logic elements, devices, controlling, symbols of transition signals, others),
- equipment for fire protection and fire fighting (detectors, control-centers, others - e.g. dry alarm valve stations),
- alarm installations (detectors, signalling, remote controls, calling systems, centers, readers, others, discontinued standards),
- installations (sensors, converters, controllers, inputs/outputs, others),
- telecommunications (filters, generators, converters, amplifiers, discountinuities, distributors, radio stations, telephones, others - e.g. fused star couplers),
- passive elements (resistors, capacitors, inductors, delay lines, piezoelectric, discontinued standards),
- active elements (diodes, transistors, thyristors, others, vacuum tubes),
- medicine (facilities, hospital reception, others),
- equipment used in house (sound recording and playback, timers, others -e.g. gyro indicators),
- lines (electric transmission tower, lines and wires, production and transformation of electricity, telecommunications),
- architectural and topographical installation plans and diagrams.