eendraads

Eendraads is the Dutch term used for a type of schematic in electrical engineering known as a single-line diagram or one-line diagram. In an eendraadschema a complex electrical installation is represented by a single line that stands for all conductors of a circuit, with symbols placed along the line to indicate components such as switches, circuit breakers, transformers, and loads. The method focuses on functional connections rather than the physical layout, making it suitable for planning, design, testing, and documentation.

The eendraadschema is used across different voltage levels, from low voltage installations in buildings to medium voltage distribution networks. It provides a compact overview of how parts of a system are connected and how power flows between sources, protection devices, and loads. In three-phase systems the diagram may label conductors as L1, L2, L3, with separate representations for neutral and protective earth where applicable. It serves as a reference that complements more detailed drawings and field wiring plans.

Reading an eendraadschema involves following the main line and interpreting the symbols placed along it to identify components and their connections. Each symbol represents a device or element, and the order along the line shows the sequence of electrical relationships from source to load. Although it simplifies the overview, it does not convey physical cable routes or spatial arrangement, which is why it is typically used in conjunction with layout drawings and wiring diagrams during design, installation, and maintenance.

Standards and notation for eendraadschema use established electrical symbols, such as those in IEC 60617, and are often aligned with national or regional requirements, including Dutch norms for electrical installations. See also single-line diagram and wiring diagram for related diagram types.