EICR
What Do C1, C2, C3 and FI Mean?
C1 = danger present (immediate action); C2 = potentially dangerous (prompt remediation); C3 = improvement recommended; FI = further investigation required. C1, C2 and FI make a report unsatisfactory.
EICR observations are classified so duty holders can prioritise action:
C1 — Danger present. Risk of injury; immediate remedial action required. C2 — Potentially dangerous. Urgent remedial action required. C3 — Improvement recommended. Not immediately dangerous; improvement advised. FI — Further investigation required without delay.
Any C1, C2 or FI results in an unsatisfactory outcome until addressed. A C3 alone does not make a report unsatisfactory. These classifications should not all be treated identically — the response is proportionate to the risk.
Related service
EICR Remedial Works
Rectification of C1, C2 and FI observations to achieve a satisfactory installation and certification.
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Knowledge
What Is an EICR?
An EICR is a formal, documented assessment of a fixed electrical installation against BS 7671, recording classified observations and a satisfactory or unsatisfactory outcome.
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What Is Included in an EICR?
An EICR covers the consumer unit, protective devices, circuits, earthing and bonding, and a representative sample of the installation, with observations and test results recorded.
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What Happens After an Unsatisfactory EICR?
C1, C2 and FI observations must be addressed. A remedial quotation is provided, work is completed, affected circuits are re-tested and electrical certification is issued where required.
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How Often Is a Commercial EICR Required?
Commercial inspection intervals are risk-based and depend on installation type and use. Intervals are guided by BS 7671 recommendations rather than a single fixed legal period.
Learn moreThis article provides general guidance and distinguishes legislation, British Standards and good practice. It is not legal advice. Always confirm the specific duties applying to your property and tenure.