A system for the detection of power or energy amounts transmitted through conductors which are connected to a low-voltage distribution box, the system comprising: two modules, each module being configured to determine a number of currents flowing through a number of conductors, the number of conductors being connected to a number of modular DIN rail components arranged within the low-voltage distribution box, and being further configured to create signals representative of the power or energy amounts which are transmitted through each of the number of conductors by using a provided signal (Su) created at a low-voltage level from at least one input voltage, each module being configured to be arranged within the low-voltage distribution box in a longitudinal direction, in particular immediately above or below the number of modular DIN rail components, and at least one functional unit, said functional unit being configured to provide a module with at least one signal (Su) which is generated at a low-voltage level from at least one input voltage on the basis of an unambiguous, one-to-one mapping instruction and to receive, from every module, signals that are representative of the power or energy amounts, a data connection line and a measuring voltage supply line being provided to interconnect the functional unit and each module, said data connection line being a bus structure, characterised in that the data connection line and the measuring voltage supply line are entirely realised by means of ribbon cables and the data connection line is realised as a continuous ribbon cable, and the transmission between the functional unit and each module has a defined, constant latency period for synchronisation. two modules, each module being configured to determine a number of currents flowing through a number of conductors, the number of conductors being connected to a number of modular DIN rail components arranged within the low-voltage distribution box, and being further configured to create signals representative of the power or energy amounts which are transmitted through each of the number of conductors by using a provided signal (Su) created at a low-voltage level from at least one input voltage, each module being configured to be arranged within the low-voltage distribution box in a longitudinal direction, in particular immediately above or below the number of modular DIN rail components, and at least one functional unit, said functional unit being configured to provide a module with at least one signal (Su) which is generated at a low-voltage level from at least one input voltage on the basis of an unambiguous, one-to-one mapping instruction and to receive, from every module, signals that are representative of the power or energy amounts, a data connection line and a measuring voltage supply line being provided to interconnect the functional unit and each module, said data connection line being a bus structure, the data connection line and the measuring voltage supply line are entirely realised by means of ribbon cables and the data connection line is realised as a continuous ribbon cable, and the transmission between the functional unit and each module has a defined, constant latency period for synchronisation.