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Improving the energy balance of vehicles is an effective way of lowering CO2 emissions. Among other things, this does entail mounting demands on the power wiring system. The intention is, for instance, to adapt the drive train to facilitate such functions as more efficient recuperation, e-boost and sailing with the aid of a 48V starter generator and a 48V battery. In addition, it is a matter of electrifying mechanical components with the aim of energy-efficient demand management to save fuel. The 48V power wiring system as an addition to the 12V system is a promising option where the task is to make the low-voltage wiring system of vehicles in the mass-market segment more powerful. Raising system voltage to 48V has the effect of fundamentally improving the efficiency of electricity generation and power distribution in the vehicle because of the reduced current and therefore the diminished ohmic losses.