Electrical Installation Certificate
Issued for new circuits, rewires and consumer unit changes. It records the design, inspection and test results.
- Step 1
Tell us the job
Call or email with a few details. For bigger jobs we visit first.
- Step 2
Free written quote
You get a clear price in writing before any work starts.
- Step 3
The work
Cables run neatly, floors and furniture protected, and your power off for as short a time as possible.
- Step 4
Test and certify
Every circuit is tested and you receive a certificate recording the results.
Inside the wall
What the colours mean
Most home circuits use twin and earth cable. The brown core is live and carries power to the fitting. The blue core is neutral and carries it back. The bare wire is earth, covered in a green and yellow sleeve where it connects, and it gives a fault somewhere safe to go.
Getting these three connected correctly at every point is the first thing we check.
Testing
The checks behind the certificate
Wiring can look tidy and still be unsafe, so every installation is tested before it is handed over. These are the checks, and the limits each one has to meet.
Continuity of protective conductors
Readings recordedConfirms the earth path is unbroken from every outlet back to the consumer unit.
Insulation resistance
At least 1 MΩShows the cable insulation is not leaking current between conductors or to earth.
Polarity
Correct at every pointChecks live and neutral are connected the right way round at every socket, switch and fitting.
Earth fault loop impedance
Within limit for each breakerConfirms a fault will trip the breaker quickly enough to protect you.
RCD operation
Within 300 ms at 30 mAProves the RCD cuts the power when current leaks to earth.
Paperwork
What you receive
The certificate that comes with the job depends on the work done.
Minor Works Certificate
Issued for small additions and alterations that do not add a new circuit, such as moving a socket.
Condition Report (EICR)
Records the condition of an installation already in place, with any faults graded C1, C2, C3 or FI.