EICR: External Earth Loop Impedance

What is the Impedance of the External Earth Loop?

When conducting an Electrical Installation Condition Report (EICR), one critical test is measuring the external earth loop impedance (Ze). This value follows Regulation 313.1 of BS 7671 (18th Edition Wiring Regulations) to ensure that your electrical system is grounded. The typical maximum values declared by the electricity distributor are:

  • 0.8 Ω for a TN-S system
  • 0.35 Ω for a TN-C-S system

However, the actual measured value may differ depending on your electrical setup.

What Happens if the Earth Fault Loop Impedance is Too High?

If the earth fault loop impedance rises too high, it can cause an excessive fault current. As a result, the protective devices, such as circuit breakers, may trip frequently. On the other hand, if the impedance falls too low, the protective device might not receive enough current to trip when necessary, leading to dangerous situations such as electrical fires or shocks.

Why is Earth Loop Impedance Crucial?

The earth fault loop impedance test is essential for confirming that, during an electrical fault, enough current flows to trip the fuse or circuit breaker. If a fault current remains undetected, circuits may overheat, potentially leading to fire hazards. Therefore, this test is a key part of an EICR to ensure the safety and compliance of your electrical system.

At MGB Electrical Solutions Ltd, your local Fulham electrician, we ensure these tests comply with the latest BS 7671 standards. Whether you’re based in SW6 Fulham or the surrounding areas, we guarantee high-quality service with safety as our top priority.

Our Testing Equipment: Kewtech Multifunction Tester – KT66DL

We use advanced equipment like the Kewtech Multifunction Tester (KT66DL) to provide accurate and efficient EICR testing. This tool allows us to conduct a range of essential tests, including:

  • Earth fault loop impedance testing
  • Insulation resistance testing
  • RCD testing
  • Continuity testing

The KT66DL offers high accuracy and delivers fast results, allowing us to ensure that your installation complies with all current safety standards. With this cutting-edge technology, we provide you with reliable and comprehensive testing for your electrical systems.


FAQs About EICR

What is an EICR and why is it important?

An Electrical Installation Condition Report (EICR) is a detailed inspection of your property’s electrical system. It checks for faults, damage, or signs of wear that could become dangerous if left unaddressed. Ensuring your electrical system complies with current regulations will protect against hazards like electric shocks, fires, and equipment failure.

How often should an EICR be done?

For rental properties, an EICR must be conducted every 5 years or at each change of tenancy. In owner-occupied homes, an EICR is recommended every 10 years. For commercial properties, the frequency depends on the type of business, typically ranging between 3 to 5 years.

What does an EICR involve?

An EICR includes a thorough assessment of the wiring, circuit breakers, fuse boards, and protective devices. Tests like earth fault loop impedance and RCD tests ensure that the system operates safely and efficiently. A qualified Fulham electrician from MGB Electrical Solutions Ltd will ensure your installation meets BS 7671 regulations.

What happens if my EICR identifies faults?

If the EICR identifies issues, the report will provide recommendations for repairs or upgrades. Our team at MGB Electrical Solutions Ltd can handle any necessary work to ensure your installation is safe and compliant.

Can an EICR fail?

Yes, an EICR can result in a fail if your electrical installation is found unsafe. The report will categorize the faults as C1 (immediate danger), C2 (potential danger), or C3 (improvements recommended). We are always ready to help resolve these issues and bring your system up to standard.

Will I lose power during the EICR?

Yes, some tests require turning off the electricity, but we aim to minimize disruption and keep you informed every step of the way.

Supporting Local Fulham Trade: Electrical4Less

At MGB Electrical Solutions Ltd, we believe in supporting our local community. We source our materials from Electrical4Less, Fulham’s leading electrical trade counter. Whether we’re working on an EICR or upgrading your installation, you can trust us to use top-quality products from a trusted local supplier.


For expert EICR inspections and thorough testing with our advanced Kewtech KT66DL Multifunction Tester, trust MGB Electrical Solutions Ltd—your experienced Fulham Electrician. Contact us today to ensure your electrical system is safe and compliant with BS 7671 standards. Thank you for reading about EICR: External Earth Loop Impedance.


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