Abstract: A wiring system for a vehicle is specified, which has a voltage source and an electrical load, whereby a need for the electrical load depends on an external condition. Furthermore, the wiring system has a load path with an electrical line, which connects the voltage source to the electrical load, and a first switching element, which is arranged in the load path, for disconnecting the electrical load from the voltage source, wherein a working range of the external condition is defined, within which the function of the electrical load is reasonable, and a control unit is arranged, which is designed in such a way that a switching on of the electrical load is prevented if the external condition lies outside the working range. Furthermore, a method for the design of an electrical line of such a wiring system is given.

Abstract: A switching apparatus electrically connects an electrical load to an energy source and contains a main current path which has a switching unit with a circuit breaker, via which the electrical load is connected to the energy source in a supply mode. An auxiliary current path is connected in parallel with the main current path and in which a first switch is arranged. A disconnection mode is performed in which the circuit breaker is open and the electrical load is connected only to the auxiliary current path to reduce electrical energy stored inside the electrical load. A diagnostic mode is also provided, in which the switching unit is open and the electrical load is connected to the energy source only via the auxiliary current path to supply the electrical load. A control unit for activating the diagnostic mode is also provided.

Abstract: A switching apparatus electrically connects an electrical load to an energy source and contains a main current path which has a switching unit with a circuit breaker, via which the electrical load is connected to the energy source in a supply mode. An auxiliary current path is connected in parallel with the main current path and in which a first switch is arranged. A disconnection mode is performed in which the circuit breaker is open and the electrical load is connected only to the auxiliary current path to reduce electrical energy stored inside the electrical load. A diagnostic mode is also provided, in which the switching unit is open and the electrical load is connected to the energy source only via the auxiliary current path to supply the electrical load. A control unit for activating the diagnostic mode is also provided.