Residual current device
Residual current devices (RCDs) are: ‘...designed to break an electrical current very easily by detecting any abnormality in the circuit, for example, through someone touching a live wire. They are normally located in the consumer unit but a separate RCD may exist to protect an additional circuit, for example, an electrical circuit used in the garden.’
Ref English Housing Survey, Profile and condition of the English housing stock, 2018-19, Published by the Ministry of Housing, Communities & Local Government in August 2020 suggests:
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