A SignalSpecification defines a set of Signals used in the vehicle electrical system. A Signal is a more general concept than Nets, Connections or Wires, as they are defined in the scope of a certain vehicle electrical system or a wiring harness. A Signal in the VEC represents a physical signal in contrast to abstract messages that are often used to define ECUs and their interfaces (e.g. in AUTOSAR). Typically the same Signals are used in different vehicles or different sections of a wiring harness. A Signal can define various properties e.g. the SignalType or the SignalForm. Furthermore a Signal can define a recommended ConductorSpecification and a recommended InsulationSpecification. This mechanism can be used for example to provide information about the recommended color coding of a certain Signal, regardless of the vehicle electrical system or wiring harness section where it is implemented.