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Accessory for the CPC 100, to measure line impedances and k-factors on overhead lines and power cables, Ground impedances on large earthing systems, as well as touch and step voltages.

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CU1 UNIT 41kg 70L 46W 41H LEADS CASE 16kg 50L 45W 20H
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The Omicron CPC 100 + CP CU1 measures 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.

Mains frequency malfunctions do not influence the measurements, as the CPC 100 + CP CU1 use variable output frequencies for measurements. This enables extremely precise and reproducible measurement results. To increase safety for the test engineer, the CP GB1 grounding unit is supplied with the CP CU1. This can divert up to 30 kA currents if its voltage limit value is exceeded.

Standard Accessories: Refer accessories list in user manual

Power Supply: Directly powered from the CPC100 instrument

Current Output Ranges: 10A, 20A, 50A, 100A RMS

Output Power: 5000 VA (45…70 Hz), cosφ < 1.0 for 8 s at 230 V AC mains voltage

Frequency Range: 15…400 Hz (15…45 Hz with reduced voltage)

Operating Temperature/Humidity Range: -10 to 55°C and 5 to 95%RH (no condensation)

Dimensions (W x H x D) (CU1 Instrument Only): 450 × 220 × 220 mm

Dimensions (W x H x D) (GB1 Grounding Box Only): 200 × 190 mm

Weight (CU1 Instrument): 28.5kg

Weight (GB1 Instrument): 4.2kg

Key Features

  • Measurement is not affected by mains frequency interference – extremely precise measurement results are obtained
  • Compliance with the strictest safety standards for overhead lines and cables connections – diverting currents up to 30 kA
  • Easy to handle – heaviest component: 29 kg
  • Automatic logging: Results are recorded automatically by the software


  • Line impedances and K-factors of overhead lines or high-voltage cables — This device is essential for analysing transmission network stability and efficiency. Accurate assessment of these parameters is crucial for effectively managing and maintaining high-voltage electrical systems.
  • Ground impedances of large systems — The Omicron CP-CU1 ensures safety and reliability in substations and power plants. Accurate ground impedance measurements prevent faults and enhance performance in complex electrical networks.
  • Step and touch voltages — This device is crucial for electrical safety assessments, especially in public and work areas. This feature guides improving safety standards in electrical installations by identifying potential electrical shock risks.
  • Mutual coupling of parallel overhead lines — The CP-CU1 is key in understanding electromagnetic interactions between lines. This is essential for minimising interference and optimising the efficiency of power systems.
  • Coupling of power lines into signal cables — This equipment is used to mitigate interference in communication and control systems. It ensures signal integrity, especially in areas where power and data lines coexist closely.

Hire the Omicron CP-CU1 today

At Brandis Hire, we provide easy, convenient and affordable test equipment rentals. As a proud Australian family-owned business, we offer top-quality gear from leading manufacturers, backed by 24/7 technical support. Our no lock-in hire periods and Australia-wide delivery options cater to your project needs.

Ready to enhance your project’s efficiency? Submit a booking request now or contact us for more information.


Why choose the Omicron CP-CU1?

The Omicron CP-CU1 is a versatile and reliable tool for various electrical testing needs. It excels in testing ground impedances of large systems, evaluating step and touch voltages and analysing mutual coupling in parallel overhead lines. Its precision in measuring line impedances and k-factors of high-voltage cables makes it indispensable for the stability and efficiency of power transmission networks.

When you hire the Omicron CP-CU1, you can access a high-quality, multifunctional device that enhances safety, accuracy and efficiency in electrical testing tasks.

What other earth testers and primary injection testers do you offer for hire?

At Brandis Hire, we offer a comprehensive range of earth and primary injection testers catering to various testing requirements. Our selection includes:

Earth testers:

Primary injection testing equipment:

Can the Omicron CP-CU1 be used for locating cable faults?

Yes, the Omicron CP-CU1 is adept at locating faults in underground cables, a crucial feature for quickly restoring services. Its advanced technology ensures minimal disruption and precise fault pinpointing, making it an invaluable tool for urban electrical systems and complex cable networks.

Why choose Brandis Hire for technical equipment rental?

Brandis Hire stands out for its effortless, flexible rental process and a vast range of quality equipment. As a family-owned Australian business, we provide personalised service, including 24/7 technical support, Australia-wide delivery and no lock-in hire periods, which translate to a hassle-free rental experience.

Is the Omicron CP-CU1 suitable for testing in harsh environments?

Yes, the CP-CU1 is designed to perform reliably in various environments, including harsh and challenging conditions. Its sturdy build and advanced technology make it suitable for outdoor settings, industrial areas and other demanding locations. Its durability ensures consistent, accurate results even in less-than-ideal scenarios.

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Data Sheet

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