Abstract: The circuit configuration according to the invention comprises an electrical signal line loop, several partial systems connected thereto, which evaluate the state of the signal line loop, wherein a first selectable switching means is looped in between a first end of the signal line loop and a first voltage connection and a second selectable switching means is looped in between a second end of the signal line loop and a second voltage connection, and a selection unit for selecting the first and second switching means. Use, e.g. in a fuel cell system.

Abstract: The invention relates to an electro-luminescent light element, in particular to a foil-shaped light element with a light emitting surface (34) for emitting light from a light pigment layer (16) arranged on a carrier (12). According to the invention the light element (10) is provided with an electrically conductive cover (30).

Abstract: The circuit configuration according to the invention comprises an electrical signal line loop, several partial systems connected thereto, which evaluate the state of the signal line loop, wherein a first selectable switching means is looped in between a first end of the signal line loop and a first voltage connection and a second selectable switching means is looped in between a second end of the signal line loop and a second voltage connection, and a selection unit for selecting the first and second switching means. Use, e.g. in a fuel cell system.

Abstract: Insulation monitoring of an electrical network such as a DC network which is electrically insulated with respect to the ground of a device, includes at least two insulation monitoring devices that monitor different network sections, which can be isolated by one or more switches. Non-contacting switches are used to alternatingly connect and isolate respective measuring resistors of the monitoring devices to, and from, ground, as a result of which the insulation monitoring devices can not negatively affect each other's measurements.

Abstract: Insulation monitoring of an electrical network such as a DC network which is electrically insulated with respect to the ground of a device, includes at least two insulation monitoring devices that monitor different network sections, which can be isolated by one or more switches. Non-contacting switches are used to alternatingly connect and isolate respective measuring resistors of the monitoring devices to, and from, ground, as a result of which the insulation monitoring devices can not negatively affect each other's measurements.

Abstract: An electrical data bus system comprises at least one monitoring device for detecting leakage of a flammable gas within a fuel zone. Pursuant to the method, upon a flammable gas leak within the fuel zone being detected, the flow of electrical current in the fuel zone, via the data bus system or any device connected to the data bus system, is prevented.