Ray asks this question about certifying a replacement consumer unit (CU) in terms of existing circuits. It has been answered by the Electrical Contractors Association (Theme – Regulation and Legislation):
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Question: When replacing a consumer unit in a domestic installation, should the test results values of the existing final circuits be inserted on to the schedule of test results?
Or should the boxes be marked with N/A, as the electrical installation certificate only covers the new work (i.e. the new consumer unit) and not existing wiring?
Answer: The schedule of test results should be fully completed with the details of the existing circuits.
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