A consumer unit distributes electricity to circuits and contains switching and protective devices. There may be more than one board or additional supplies. The accessible labels help describe an installation; they do not verify it.

Keep the enclosure closed. Incoming parts may remain live with its main switch off. Follow the installed device’s instructions for a permitted user test or control, and do not approach wet, hot or damaged equipment. Repeated trips or an unexplained fault need assessment rather than repeated resets.