What Is a C3 Code on an EICR?
C3 – Improvement Recommended
C3 observations indicate items that are not considered dangerous, but where improvements are recommended to enhance safety, reliability, and compliance with current UK electrical standards. Examples include missing RCD protection in low-risk locations, minor labelling omissions, or equipment that could be better protected. Addressing C3 observations can help reduce future risks and bring the installation in line with modern standards. For professional assistance, see our EICR inspection service.
A C3 code does not result in an unsatisfactory EICR and does not require immediate action. A qualified electrician can advise on any recommended improvements and provide a clear quote if you choose to carry out the work. Many homeowners choose to address C3 observations over time, particularly where improvements are cosmetic or relate to bringing the installation up to current standards. For rental properties, landlords may choose to carry out C3 improvements to align the installation with current standards and good practice.
While a C3 does not indicate a fault, it highlights areas where the installation could be improved to meet current standards.
Common examples of C3 observations include:
RCD and Circuit Protection
• Absence of RCD protection for a socket-outlet that is unlikely to supply portable or mobile equipment for outdoors
• Absence of RCD protection in situations where it is recommended but not required for safety
• Absence of RCD protection for circuits in a location containing a bath or shower where supplementary bonding is present
• Reliance on a voltage-operated earth-leakage circuit-breaker for fault protection
• Absence of a quarterly test notice for any RCD or voltage-operated earth-leakage circuit-breaker
• Absence of AFDD (Arc Fault Detection Device) where required for added fire protection
• Absence of SPD (Surge Protection Device) for protection of sensitive or critical equipment
Circuit Conductors and Cabling
• Absence of circuit protective conductors in circuits with only Class II (all-insulated) luminaires and switches
• Bare protective conductor of an insulated and sheathed cable not sleeved or colour coded
• Sheath of an insulated and sheathed non-armoured cable not taken inside the enclosure of an accessory
• Cables not adequately supported, increasing risk of strain
Equipment Positioning and Notices
• Electrical equipment with an inadequate IP rating for the location, if this does not result in potential danger
• Socket-outlet positioned in a way that could damage socket, plug, or flex
• Absence of circuit identification details
• Absence of “Safety Electrical Connection — Do Not Remove” notice at earthing and bonding points
• Plastic consumer unit installed under wooden stairs or in an escape route
• Mixed manufacturer switchgear in a consumer unit where no modifications have been made
• Twin and earth cable used outside with no additional protection
Important Note
⚡ C3 observations are considered improvements recommended rather than urgent faults. While these are not dangerous, addressing them improves safety, clarity, and compliance. Repairs and improvements should be carried out by a qualified electrician. See our EICR inspection service for professional assistance.
Other classifications include EICR Code C1 (danger present), EICR Code C2 (potentially dangerous) and EICR Code FI (further investigation).
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• All installations come with full certification and are emailed for your records.
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