Abstract: The fragmentation casing has a one-piece hollow body (1) that incorporates nominal break points; this hollow body (1) is divided at least in one section (4) by at least one separating cut (5) that forms a separating gap. The separating cut is so made that the hollow body remains in the form of a one-piece structure. The surfaces of the separating cut that are adjacent in the separating gap are brought into contact with each other and are so fixed in contact with each other.

Abstract: An apparatus and method are described wherein the apparent power fed to an alternating current consumer is measured by an active power measuring device or counter through which the current passes and which has a separate voltage input fed from an amplifier having two inputs. The first amplifier input receives a constant, limited auxiliary voltage which is induced from the current path and in phase with the consumer current. The second amplifier input is used for continuously adjusting the auxiliary voltage in accordance with the instantaneous value of the consumer voltage. For this purpose a comparing device, such as a bridge circuit, may be provided for comparing the consumer voltage with the voltage applied to the power measuring device. Variations in the comparison control can be transmitted, for example, by a small electric motor or a sample and hold circuit which in turn controls a solid state or other variable resistance device connected to the second input.