What Is an F1 Code on an EICR?
F1 – Functional / Improvement Observations
F1 observations highlight areas where the electrical installation could be improved to make it more convenient, easier to maintain, or better aligned with current standards. These are not dangerous, but addressing them helps improve safety, reliability, and long-term functionality. Examples include missing circuit identification, inadequate socket numbers, or lighting circuits not fully compliant with the latest wiring standards. For professional assistance, see our EICR inspection service.
Common examples of C1 observations include:
Supply and Earthing
• Electricity supply characteristics (voltage or external earth fault loop impedance) not conforming to supply industry norms
• Absence of a reliable earth connection to a recessed metallic back box of an accessory
• Inadequate cross-sectional area of a main protective bonding conductor (6 mm², no thermal damage)
• Absence of supplementary bonding for installed Class II equipment where required for future replacement with Class I equipment
• Main protective bonding to gas, water, or other service pipes inaccessible for inspection, testing, or maintenance
Circuit and Conductor Arrangement
• Protective conductor of a lighting circuit not (or incorrectly) terminated at the final connection point
• Switch lines not identified as line conductors at terminations (e.g., blue wire not sleeved brown)
• Circuit protective conductors or final circuit conductors in a consumer unit not arranged or marked for inspection, testing, or alteration
• Installation not divided into an adequate number of circuits to minimise inconvenience during faults, inspection, or maintenance
Sockets and Flex
Important Note
⚡ F1 observations are functional or improvement-related issues rather than faults. While not dangerous, addressing them improves safety, convenience, and compliance. Repairs or upgrades should 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.
Honest advice on any electrical work required
Call now: 01295 533378
Mobile: 07740 100378