What Is a C2 Code on an EICR?
C2 – Potentially Dangerous
C2 observations indicate a potentially dangerous electrical fault. These are not immediate risks like C1, but they are still unsafe and require prompt repair by a qualified electrician. Examples include missing earthing, faulty RCD protection, loose connections, or equipment installed in a way that could cause overheating or fire. Addressing C2 observations promptly helps keep your property safe and compliant with UK electrical standards. For professional assistance, see our EICR inspection service.
Examples of C2 observations include:
Earthing Issues
• Absence of a reliable and effective means of earthing for the installation
• A public utility water pipe or gas/oil pipe being used as the means of earthing
• Cross-sectional area of the earthing conductor not meeting adiabatic requirements
• Inadequate main protective bonding conductor (<6 mm²) or evidence of thermal damage
Supplementary Bonding Issues
• Absence of supplementary bonding where required (e.g., locations containing a bath or shower), unless the following:
Three conditions are satisfied:
1. All final circuits comply with Regulation 411.3.2 for automatic disconnection
2. All final circuits have additional protection by a 30 mA RCD
3. All extraneous-conductive-parts are effectively connected to the main protective bonding
Supplementary bonding helps reduce the risk of electric shock by connecting metal parts in wet locations, ensuring any fault current safely trips the protective device.
RCD and Circuit Protection
• Main RCD or voltage-operated earth-leakage circuit-breaker failing to operate on test
• Absence of RCD protection for outdoor equipment or socket-outlets in wet locations
• Absence of a circuit protective conductor for lighting or Class I equipment circuits
• Absence of main protective bonding at socket-outlets less than 3 m from bath/shower zone
• Circuits with ineffective overcurrent protection (e.g., oversized fuse wire)
• Protective device installed in neutral only, or separate protective devices in line and neutral
• Earth fault loop impedance exceeding prescribed values
Wiring and Connection Issues
• Discontinuous or cross-connected ring final circuits
• Loose or unsuitable connections, or deteriorated insulation on live conductors
• Sheath of non-armoured cable not properly enclosed in accessory enclosures
• Unenclosed electrical connections at luminaires
Fire and Equipment Risks
• Fire risk from incorrectly installed equipment or lamps exceeding rated wattage
• Evidence of excessive heat (charring) from electrical equipment
• Unsatisfactory functional operation of equipment that could cause danger
• Immersion heater not compliant with BS EN 60335-2-73 (no secondary safety cut-out)
• Equipment with inadequate IP rating for location, risking danger
Other Observations
• Absence of warning notices for alternative electricity sources (e.g., generators)
• Fixed equipment lacking a means to switch off for safe mechanical maintenance
Important Safety Notice
⚡ C2 observations are considered unsatisfactory and should be addressed promptly. Repairs must be carried out by a qualified electrician. See our EICR inspection service for professional assistance.
Why Choose RW Currion for Your Electrical Work?
• Fully qualified and insured
• Clear explanations — no jargon
• Work completed to the latest BS 7671 standards
• Safety-first approach to protect your home, family, and electronics
• All installations come with full certification and are emailed for your records.
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