What are C1 C2 C3 and FI codes on an EICR?

Electrical Installation Condition Report

An Electrical Installation Condition Report, more commonly known as an EICR, is one of the most important documents connected to electrical safety in the home or workplace. Yet for many homeowners and landlords, the codes listed on the report can feel confusing or even alarming. Terms such as C1 C2 C3 and FI often appear without much explanation, leaving people unsure about the condition of their electrics and what they need to do next.

This guide has been written to explain those codes clearly and calmly, without technical jargon. Whether you own your home, rent out a property, or manage several buildings across South London, understanding EICR codes will help you make informed decisions and keep people safe.

What is an EICR and why does it matter?

An EICR is a formal assessment of the safety and condition of a fixed electrical installation. It is carried out by a qualified electrical safety inspector who checks wiring, sockets, consumer units, earthing and other key components against current safety standards, including BS 7671.

The purpose of an EICR is not to find fault for the sake of it, but to identify any issues that could pose a risk now or in the future. Electrical faults are one of the leading causes of domestic fires in the UK, which is why regular inspections are essential.

For landlords, an EICR is a legal requirement. For homeowners, it is a highly recommended safeguard and often requested during property sales.

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What do the EICR codes mean?

After completing an inspection, the electrician assigns codes to any observations found. These codes indicate the severity of the issue and whether remedial work is required.

There are four main outcomes you will see on an EICR
C1
C2
C3
FI

Understanding the difference between them is crucial.

What is a C1 code?

A C1 code means danger present. This is the most serious classification on an EICR.

If a C1 issue is identified, there is an immediate risk of electric shock or fire. The installation is considered unsafe to use until the problem is resolved.

Common examples of C1 issues include
• Exposed live wires that can be touched
• Severe overheating of electrical components
• Incorrectly wired sockets creating a shock risk
• Damaged consumer units with accessible live parts

When a C1 is found, a professional electrical company will usually make the situation safe immediately, often by isolating the affected circuit. Urgent repairs are then required before the installation can be deemed safe.

What is a C2 code?

A C2 code means potentially dangerous. While there may not be immediate danger, there is a clear risk that could develop into a serious hazard if left unattended.

C2 issues require urgent attention and remedial work should be carried out as soon as possible.

Examples of C2 observations include
• Lack of proper earthing or bonding
• Older consumer units without modern safety protection
• Incorrectly rated circuit protection
• Signs of overheating that have not yet caused damage

Although the electrics may still function, a C2 result means the installation does not meet current safety standards. Acting promptly reduces the risk of future failure or injury.

What is a C3 code?

A C3 code means improvement recommended. This is not a safety failure, but rather an indication that the installation could be improved to better align with modern standards.

C3 issues do not make an installation unsafe and they do not require immediate work. However, addressing them can improve safety, reliability and long term value.

Typical C3 examples include
• Older wiring systems that are still serviceable
• Consumer units that work safely but lack newer features
• Absence of additional protection where now recommended

For homeowners planning renovations or upgrades such as EV Chargers installation, dealing with C3 items can be a sensible step.

What does FI mean on an EICR?

FI stands for further investigation required. This code is used when the electrical safety inspector cannot fully assess an issue during the initial inspection.

FI does not automatically mean something is dangerous. It means that more detailed checks are needed before a final conclusion can be reached.

Examples include
• Concealed wiring that cannot be accessed
• Equipment that could not be tested at the time
• Inconsistent test readings

Once further investigation is completed, the FI observation will usually result in a C1 C2 or C3 classification.

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Why choose a professional electrical company?

An EICR should only be carried out by qualified electricians who understand current regulations and local requirements. A professional electrical company will not only identify issues accurately but also explain them clearly and honestly.

At Contact Electrician, inspections are carried out by experienced electrical safety inspectors who work across South London. Their approach is calm, transparent and focused on safety rather than unnecessary work. Whether you need an EICR in London, remedial electrical services, or advice on EV Chargers, professional guidance makes all the difference.

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Final thoughts

Understanding C1 C2 C3 and FI codes removes much of the anxiety surrounding an EICR. These classifications exist to protect people, not to complicate property ownership. When acted upon appropriately, they help ensure that electrical systems remain safe, compliant and reliable.

If you need a clear and professional EICR in South London, or advice on electrical services including EV Chargers installation, Contact Electrician is ready to help.

For expert EICRs, reliable electricians and friendly advice from a trusted electrical company in South London, contact Contact Electrician today. Book your inspection, request a free quote, or speak to a qualified electrical safety inspector who puts safety first.

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