What Does a C1 Mean on an EICR? Danger Present Explained

What Does a C1 Mean on an EICR? Is It Immediately Dangerous?

If you’ve received an Electrical Installation Condition Report (EICR) containing a C1 classification, this is the most serious classification code that can be recorded during an EICR.

A C1 means:

“Danger Present – Risk of Injury – Immediate Remedial Action Required.”

Unlike a C2, which identifies a potentially dangerous condition, a C1 indicates that the inspector has identified a condition presenting an immediate risk.

An EICR containing a C1 will be assessed as Unsatisfactory, and the danger should be addressed immediately.

In this guide, we’ll explain what a C1 means, examples of defects that could potentially warrant a C1 classification, how it differs from C2, C3 and FI, and what landlords, homeowners and property professionals should do if one appears on an EICR.

What Is a C1 on an EICR?

During an EICR, the electrician inspects and tests the fixed electrical installation to assess its condition and identify defects that could affect electrical safety.

Where an observation is considered to present an immediate danger, it can be assigned a C1 classification.

The important distinction is the presence of actual danger at the time of inspection.

A C1 is therefore not simply something that fails to comply with the latest Wiring Regulations or an electrical installation that is old.

There must be a condition that presents a risk of injury.

Does a C1 Mean an EICR Has Failed?

Yes, in everyday terminology.

Technically, an EICR isn’t recorded as simply “passed” or “failed”. The overall assessment is recorded as either:

Satisfactory

or

Unsatisfactory

If a C1 observation is recorded, the overall EICR will be Unsatisfactory.

Immediate remedial action is required to remove the danger.

How Serious Is a C1?

A C1 is the highest-severity classification used on an EICR.

It means the inspector believes that a dangerous condition exists which creates a risk of injury.

This is significantly different from identifying something that could become dangerous under certain circumstances.

A useful way of understanding the distinction is:

C1 = Danger is present now.

C2 = The condition is potentially dangerous.

This distinction is important because it prevents every electrical defect from automatically being classified at the highest level.

What Are Some Examples of C1 EICR Defects?

There isn’t a simple list where every particular defect automatically receives a C1.

The inspector has to consider the actual circumstances and level of risk present.

However, examples of conditions that could potentially warrant a C1 include:

Accessible Exposed Live Parts

If live electrical conductors or terminals are exposed and can readily be touched, there may be an immediate risk of electric shock.

Depending on accessibility and the circumstances, this could warrant a C1 classification.

Severely Damaged Electrical Equipment Exposing Live Components

A badly damaged socket, switch, isolator or other electrical accessory may leave live parts accessible.

Where those live parts present an immediate risk of contact, a C1 may be appropriate.

Exposed Live Conductors

Loose or unterminated live conductors that are accessible can present a direct electric-shock hazard.

Again, the inspector would assess whether danger is actually present rather than assigning a classification purely from the description of the defect.

Conductive Parts That Have Become Live

Under certain fault conditions, metalwork or other conductive parts could become energised.

If testing establishes that an accessible conductive part is actually live and presents an immediate electric-shock risk, this would be a serious safety concern requiring immediate action.

What Should the Electrician Do When a C1 Is Found?

Because a C1 represents danger present, it shouldn’t simply be recorded on the report and left without consideration of the immediate risk.

Where possible and with appropriate permission, the inspector should take action to remove or reduce the danger.

Depending on the circumstances, this could involve safely isolating the affected circuit or equipment.

The permanent remedial work may then be carried out separately.

The exact action will depend upon the defect and installation.

Can the Electrician Turn the Electricity Off?

Potentially, yes.

If an electrical circuit or item of equipment presents an immediate danger, isolation may be necessary to make the installation safe.

That doesn’t necessarily mean electricity to the entire property must be disconnected.

For example, it may be possible to isolate only the affected circuit.

However, this depends entirely upon the nature and location of the defect.

Safety takes priority over keeping a dangerous circuit energised.

What’s the Difference Between C1 and C2?

This is one of the most important distinctions when understanding an EICR.

C1 – Danger Present

A C1 means there is a risk of injury and immediate remedial action is required.

The danger already exists.

C2 – Potentially Dangerous

A C2 means the condition is potentially dangerous and urgent remedial action is required.

The condition may not present immediate danger at the time of inspection, but circumstances could arise in which it becomes dangerous.

Both classifications make an EICR Unsatisfactory, but they represent different levels of risk.

Our separate guide on what a C2 means on an EICR explains this classification in more detail.

Internal link: Link the bold text above directly to the C2 article we’ve just created.

What About C3?

A C3 means:

Improvement Recommended.

Unlike C1 and C2, a C3 does not by itself make an EICR Unsatisfactory.

This is particularly important when inspecting older electrical installations.

An installation doesn’t automatically become dangerous simply because it doesn’t meet every requirement applicable to a brand-new installation today.

A competent inspector should classify the actual safety risk presented by the existing condition.

We’ll cover this separately in our C3 EICR guide.

What Does FI Mean?

FI means:

Further Investigation Required Without Delay.

This is used where the inspector has identified something requiring additional investigation to determine whether a dangerous or potentially dangerous condition exists.

An FI will also result in an Unsatisfactory EICR.

We’ll cover FI in detail as part of this EICR classification series.

Does a C1 Mean the Property Needs Rewiring?

No.

A C1 classification identifies a particular dangerous condition. It doesn’t automatically mean the entire electrical installation requires replacement.

For example, an immediate danger caused by one damaged accessory may potentially be rectified by repairing or replacing that particular accessory.

Conversely, an inspection could identify wider deterioration throughout an installation that requires considerably more extensive remedial work.

The appropriate solution should therefore be based on the actual condition of the installation rather than the classification code alone.

Can an Old Consumer Unit Receive a C1?

Age alone isn’t sufficient reason to classify a consumer unit as C1.

An older consumer unit may not provide all of the protective features expected of a new installation, but that doesn’t automatically mean danger is present.

The inspector must assess the actual condition.

This principle applies throughout an EICR: non-compliance with the latest requirements does not automatically equal immediate danger.

Can You Continue Using a Circuit With a C1?

Where a C1 has correctly identified an immediate danger, the affected part of the installation shouldn’t simply continue being used as normal.

The dangerous condition needs to be removed.

Depending on the circumstances, this could mean isolating the affected circuit until the required repair has been completed.

If you’ve received a C1 observation and are unsure whether a circuit is safe to use, seek advice from a competent electrical contractor rather than assuming it can remain energised.

What Happens After the C1 Has Been Repaired?

Once the dangerous condition has been rectified, the contractor carrying out the work should provide appropriate documentation for the work undertaken.

The original EICR remains a record of the installation’s condition at the time the inspection was carried out.

Evidence of the subsequent remedial work should therefore be retained alongside the original report.

For landlords and property managers, maintaining this documentation is particularly important for demonstrating that identified electrical safety defects have been addressed.

C1 Codes in Rental Properties

A C1 should be taken particularly seriously within rented accommodation.

Where an electrical safety report identifies remedial or further investigative work, landlords in England can have statutory obligations regarding completion of the required work.

A C1 already represents an immediate electrical danger, so action should be taken without delay.

Landlords and managing agents should also retain appropriate records showing how the defect was made safe and subsequently rectified.

Should I Question a C1 Classification?

You are entitled to ask the inspector to explain any classification recorded on your EICR.

With a C1, a particularly useful question is:

“What is the immediate danger and how could somebody be injured?”

The electrician should be able to identify the dangerous condition and explain why it warrants a C1 rather than a C2 or C3.

If the reasoning isn’t clear, you can seek a second professional opinion from another suitably competent electrical contractor.

However, because C1 means danger is present, you shouldn’t delay making an actually dangerous condition safe while disputing the wording of a report.

Need Help With a C1 or Unsatisfactory EICR?

Switch Electrical & Mechanical Services Ltd provides EICR testing, electrical fault finding and EICR remedial works throughout Newcastle, Gateshead and the surrounding Tyne & Wear area.

If you’ve received an Unsatisfactory EICR from another contractor, we can review the report, investigate the observations where necessary and provide a quotation for the remedial works required.

For landlords and property professionals, we can also assist with ongoing electrical inspection, testing and compliance requirements.