The CPC 100 + CP CU1 measure line impedances and k-factors on overhead lines and power cables. Ground impedances can also be determined on large systems with the CP CU1, as well as touch and step voltages. To increase safety for the test engineer, the CP GB1 grounding unit is supplied with the CP CU1. This can divert currents of up to 30 kA if its voltage limit value is exceeded.