I have heard that I only need to have a percentage of the system tested to comply with regulations. Is this true?

The IEE regulations dictate that you can only rely upon sample testing if you hold previous full system records, the installation is in excellent condition, no faults are found during the sample testing and no undocumented alterations have been carried out since the system was new or last tested. This is not true of most electrical installations, for which a full Electrical Installation Condition Report should be undertaken.

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