C1 C2 C3 Meanings
C1, C2 and C3 are the observation codes used on an Electrical Installation Condition Report (EICR). These codes explain how serious an electrical defect is and whether remedial work is required.
Understanding the difference between the codes matters because some observations make an EICR unsatisfactory, while others are recommendations only.
C1
Danger present.
This is the most serious EICR observation code. A C1 indicates there is an immediate risk of injury, electric shock or fire.
- Exposed live conductors
- Unsafe damaged accessories
- Immediate electric shock risk
- Serious overheating
C2
Potentially dangerous.
A C2 code means the installation is not considered immediately dangerous at that exact moment, but could become dangerous under fault conditions or continued use.
- Missing RCD protection
- Incorrect bonding
- Unsafe consumer unit arrangements
- Electrical defects requiring repair
C3
Improvement recommended.
A C3 observation identifies something that does not meet the latest standards or would benefit from upgrading, but is not normally considered dangerous.
- Older but serviceable equipment
- Minor improvements recommended
- Installations not to current regulations
- General upgrade advice
FI
Further investigation required.
This code is used where the inspector cannot fully determine the safety of an issue during the inspection and testing process.
- Unknown defects
- Possible hidden damage
- Suspected unsafe conditions
- Additional investigation needed
Which EICR codes fail a report?
C1, C2 and FI observations normally make an EICR unsatisfactory. C3 observations are generally recommendations and do not normally fail the report on their own.
Landlord EICR observation codes
Landlords and managing agents often receive EICR reports containing technical observation codes without any clear explanation. Understanding those codes matters because they determine whether the property requires remedial work or further investigation.
Where C1, C2 or FI observations are present, the next step is normally remedial works to bring the installation back to a satisfactory condition.
Consumer unit related EICR codes
A large percentage of C2 observations relate to consumer units. Missing RCD protection, damaged fuse boards, overcrowding or incorrect protection devices are all common reasons EICRs become unsatisfactory.
Read more about: consumer unit failures .
Failed EICRs in London
BIM Electrical Group helps landlords, HMOs and managing agents across London with failed EICRs, remedial works and follow-up certification.
The aim is simple: identify the defects clearly, complete the remedial works properly and close out the compliance issues efficiently.
TESC registered EICRs
BIM Electrical Group works alongside The Electrical Safety Council to support clear reporting and electrical compliance tracking.
This helps landlords and agents maintain a clearer record of inspection status and remedial actions.